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主要内容：Java项目、前端项目、Python项目、小程序开发、大数据项目、单片机

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项目编号：BS-Python-007

一，环境介绍

语言环境：Python3.8  Django4.2.1

数据库：Mysql: mysql5.7

开发工具：IDEA

前端技术：HTML+CSS+JS

二，项目简介

主要功能：

- 文章，页面，分类目录，标签的添加，删除，编辑等。文章、评论及页面支持`Markdown`，支持代码高亮。

- 支持文章全文搜索。

- 完整的评论功能，包括发表回复评论，以及评论的邮件提醒，支持`Markdown`。

- 侧边栏功能，最新文章，最多阅读，标签云等。

- 支持Oauth登陆，现已有Google,GitHub,facebook,微博,QQ登录。

- 支持`Redis`缓存，支持缓存自动刷新。

- 简单的SEO功能，新建文章等会自动通知Google和百度。

- 集成了简单的图床功能。

- 集成`django-compressor`，自动压缩`css`，`js`。

- 网站异常邮件提醒，若有未捕捉到的异常会自动发送提醒邮件。

- 集成了微信公众号功能，现在可以使用微信公众号来管理你的vps了。

系统的用户可以分为两类，前端用户和后台管理用户，用户的权限可以在后台由管理员进行管理设定。系统功能相对比较完整，包含了用户管理、博文分类管理、博文管理、标签管理、评论管理、友情连接管理、侧边栏管理、第三方授权登录管理等等

三，系统展示

系统首页

前端用户登录

博客详情

文档归类

后台管理

用户管理

分类管理

文章管理

标签管理

网站配置

评论管理

四，核心代码展示

from django.contrib.admin import AdminSite
from django.contrib.admin.models import LogEntry
from django.contrib.sites.admin import SiteAdmin
from django.contrib.sites.models import Site

from accounts.admin import *
from blog.admin import *
from blog.models import *
from comments.admin import *
from comments.models import *
from djangoblog.logentryadmin import LogEntryAdmin
from oauth.admin import *
from oauth.models import *
from owntracks.admin import *
from owntracks.models import *
from servermanager.admin import *
from servermanager.models import *


class DjangoBlogAdminSite(AdminSite):
    site_header = 'Python博客后台管理'
    site_title = '后台管理'

    def __init__(self, name='admin'):
        super().__init__(name)

    def has_permission(self, request):
        return request.user.is_superuser

    # def get_urls(self):
    #     urls = super().get_urls()
    #     from django.urls import path
    #     from blog.views import refresh_memcache
    #
    #     my_urls = [
    #         path('refresh/', self.admin_view(refresh_memcache), name="refresh"),
    #     ]
    #     return urls + my_urls


admin_site = DjangoBlogAdminSite(name='admin')

admin_site.register(Article, ArticlelAdmin)
admin_site.register(Category, CategoryAdmin)
admin_site.register(Tag, TagAdmin)
admin_site.register(Links, LinksAdmin)
admin_site.register(SideBar, SideBarAdmin)
admin_site.register(BlogSettings, BlogSettingsAdmin)

admin_site.register(commands, CommandsAdmin)
admin_site.register(EmailSendLog, EmailSendLogAdmin)

admin_site.register(BlogUser, BlogUserAdmin)

admin_site.register(Comment, CommentAdmin)

admin_site.register(OAuthUser, OAuthUserAdmin)
admin_site.register(OAuthConfig, OAuthConfigAdmin)

admin_site.register(OwnTrackLog, OwnTrackLogsAdmin)

admin_site.register(Site, SiteAdmin)

admin_site.register(LogEntry, LogEntryAdmin)

from django.contrib import admin
from django.contrib.admin.models import LogEntry, ADDITION, CHANGE, DELETION
from django.contrib.contenttypes.models import ContentType
from django.urls import reverse, NoReverseMatch
from django.utils.encoding import force_str
from django.utils.html import escape
from django.utils.safestring import mark_safe
from django.utils.translation import pgettext_lazy, gettext_lazy  as _

action_names = {
    ADDITION: pgettext_lazy('logentry_admin:action_type', 'Addition'),
    DELETION: pgettext_lazy('logentry_admin:action_type', 'Deletion'),
    CHANGE: pgettext_lazy('logentry_admin:action_type', 'Change'),
}


class LogEntryAdmin(admin.ModelAdmin):
    date_hierarchy = 'action_time'

    readonly_fields = ([f.name for f in LogEntry._meta.fields] +
                       ['object_link', 'action_description', 'user_link',
                        'get_change_message'])

    fieldsets = (
        (_('Metadata'), {
            'fields': (
                'action_time',
                'user_link',
                'action_description',
                'object_link',
            )
        }),
        (_('Details'), {
            'fields': (
                'get_change_message',
                'content_type',
                'object_id',
                'object_repr',
            )
        }),
    )

    list_filter = [
        'content_type'
    ]

    search_fields = [
        'object_repr',
        'change_message'
    ]

    list_display_links = [
        'action_time',
        'get_change_message',
    ]
    list_display = [
        'action_time',
        'user_link',
        'content_type',
        'object_link',
        'action_description',
        'get_change_message',
    ]

    def has_add_permission(self, request):
        return False

    def has_change_permission(self, request, obj=None):
        return (
                       request.user.is_superuser or
                       request.user.has_perm('admin.change_logentry')
               ) and request.method != 'POST'

    def has_delete_permission(self, request, obj=None):
        return False

    def object_link(self, obj):
        object_link = escape(obj.object_repr)
        content_type = obj.content_type

        if obj.action_flag != DELETION and content_type is not None:
            # try returning an actual link instead of object repr string
            try:
                url = reverse(
                    'admin:{}_{}_change'.format(content_type.app_label,
                                                content_type.model),
                    args=[obj.object_id]
                )
                object_link = '<a href="{}">{}</a>'.format(url, object_link)
            except NoReverseMatch:
                pass
        return mark_safe(object_link)

    object_link.admin_order_field = 'object_repr'
    object_link.short_description = _('object')

    def user_link(self, obj):
        content_type = ContentType.objects.get_for_model(type(obj.user))
        user_link = escape(force_str(obj.user))
        try:
            # try returning an actual link instead of object repr string
            url = reverse(
                'admin:{}_{}_change'.format(content_type.app_label,
                                            content_type.model),
                args=[obj.user.pk]
            )
            user_link = '<a href="{}">{}</a>'.format(url, user_link)
        except NoReverseMatch:
            pass
        return mark_safe(user_link)

    user_link.admin_order_field = 'user'
    user_link.short_description = _('user')

    def get_queryset(self, request):
        queryset = super(LogEntryAdmin, self).get_queryset(request)
        return queryset.prefetch_related('content_type')

    def get_actions(self, request):
        actions = super(LogEntryAdmin, self).get_actions(request)
        if 'delete_selected' in actions:
            del actions['delete_selected']
        return actions

    def action_description(self, obj):
        return action_names[obj.action_flag]

    action_description.short_description = _('action')

    def get_change_message(self, obj):
        return obj.get_change_message()

    get_change_message.short_description = _('change message')

# encoding: utf-8

from __future__ import absolute_import, division, print_function, unicode_literals

import json
import os
import re
import shutil
import threading
import warnings

import six
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.utils.datetime_safe import datetime
from django.utils.encoding import force_str
from haystack.backends import BaseEngine, BaseSearchBackend, BaseSearchQuery, EmptyResults, log_query
from haystack.constants import DJANGO_CT, DJANGO_ID, ID
from haystack.exceptions import MissingDependency, SearchBackendError, SkipDocument
from haystack.inputs import Clean, Exact, PythonData, Raw
from haystack.models import SearchResult
from haystack.utils import get_identifier, get_model_ct
from haystack.utils import log as logging
from haystack.utils.app_loading import haystack_get_model
from jieba.analyse import ChineseAnalyzer
from whoosh import index
from whoosh.analysis import StemmingAnalyzer
from whoosh.fields import BOOLEAN, DATETIME, IDLIST, KEYWORD, NGRAM, NGRAMWORDS, NUMERIC, Schema, TEXT
from whoosh.fields import ID as WHOOSH_ID
from whoosh.filedb.filestore import FileStorage, RamStorage
from whoosh.highlight import ContextFragmenter, HtmlFormatter
from whoosh.highlight import highlight as whoosh_highlight
from whoosh.qparser import QueryParser
from whoosh.searching import ResultsPage
from whoosh.writing import AsyncWriter

try:
    import whoosh
except ImportError:
    raise MissingDependency(
        "The 'whoosh' backend requires the installation of 'Whoosh'. Please refer to the documentation.")

# Handle minimum requirement.
if not hasattr(whoosh, '__version__') or whoosh.__version__ < (2, 5, 0):
    raise MissingDependency(
        "The 'whoosh' backend requires version 2.5.0 or greater.")

# Bubble up the correct error.

DATETIME_REGEX = re.compile(
    '^(?P<year>\d{4})-(?P<month>\d{2})-(?P<day>\d{2})T(?P<hour>\d{2}):(?P<minute>\d{2}):(?P<second>\d{2})(\.\d{3,6}Z?)?$')
LOCALS = threading.local()
LOCALS.RAM_STORE = None


class WhooshHtmlFormatter(HtmlFormatter):
    """
    This is a HtmlFormatter simpler than the whoosh.HtmlFormatter.
    We use it to have consistent results across backends. Specifically,
    Solr, Xapian and Elasticsearch are using this formatting.
    """
    template = '<%(tag)s>%(t)s</%(tag)s>'


class WhooshSearchBackend(BaseSearchBackend):
    # Word reserved by Whoosh for special use.
    RESERVED_WORDS = (
        'AND',
        'NOT',
        'OR',
        'TO',
    )

    # Characters reserved by Whoosh for special use.
    # The '\\' must come first, so as not to overwrite the other slash
    # replacements.
    RESERVED_CHARACTERS = (
        '\\', '+', '-', '&&', '||', '!', '(', ')', '{', '}',
        '[', ']', '^', '"', '~', '*', '?', ':', '.',
    )

    def __init__(self, connection_alias, **connection_options):
        super(
            WhooshSearchBackend,
            self).__init__(
            connection_alias,
            **connection_options)
        self.setup_complete = False
        self.use_file_storage = True
        self.post_limit = getattr(
            connection_options,
            'POST_LIMIT',
            128 * 1024 * 1024)
        self.path = connection_options.get('PATH')

        if connection_options.get('STORAGE', 'file') != 'file':
            self.use_file_storage = False

        if self.use_file_storage and not self.path:
            raise ImproperlyConfigured(
                "You must specify a 'PATH' in your settings for connection '%s'." %
                connection_alias)

        self.log = logging.getLogger('haystack')

    def setup(self):
        """
        Defers loading until needed.
        """
        from haystack import connections
        new_index = False

        # Make sure the index is there.
        if self.use_file_storage and not os.path.exists(self.path):
            os.makedirs(self.path)
            new_index = True

        if self.use_file_storage and not os.access(self.path, os.W_OK):
            raise IOError(
                "The path to your Whoosh index '%s' is not writable for the current user/group." %
                self.path)

        if self.use_file_storage:
            self.storage = FileStorage(self.path)
        else:
            global LOCALS

            if getattr(LOCALS, 'RAM_STORE', None) is None:
                LOCALS.RAM_STORE = RamStorage()

            self.storage = LOCALS.RAM_STORE

        self.content_field_name, self.schema = self.build_schema(
            connections[self.connection_alias].get_unified_index().all_searchfields())
        self.parser = QueryParser(self.content_field_name, schema=self.schema)

        if new_index is True:
            self.index = self.storage.create_index(self.schema)
        else:
            try:
                self.index = self.storage.open_index(schema=self.schema)
            except index.EmptyIndexError:
                self.index = self.storage.create_index(self.schema)

        self.setup_complete = True

    def build_schema(self, fields):
        schema_fields = {
            ID: WHOOSH_ID(stored=True, unique=True),
            DJANGO_CT: WHOOSH_ID(stored=True),
            DJANGO_ID: WHOOSH_ID(stored=True),
        }
        # Grab the number of keys that are hard-coded into Haystack.
        # We'll use this to (possibly) fail slightly more gracefully later.
        initial_key_count = len(schema_fields)
        content_field_name = ''

        for field_name, field_class in fields.items():
            if field_class.is_multivalued:
                if field_class.indexed is False:
                    schema_fields[field_class.index_fieldname] = IDLIST(
                        stored=True, field_boost=field_class.boost)
                else:
                    schema_fields[field_class.index_fieldname] = KEYWORD(
                        stored=True, commas=True, scorable=True, field_boost=field_class.boost)
            elif field_class.field_type in ['date', 'datetime']:
                schema_fields[field_class.index_fieldname] = DATETIME(
                    stored=field_class.stored, sortable=True)
            elif field_class.field_type == 'integer':
                schema_fields[field_class.index_fieldname] = NUMERIC(
                    stored=field_class.stored, numtype=int, field_boost=field_class.boost)
            elif field_class.field_type == 'float':
                schema_fields[field_class.index_fieldname] = NUMERIC(
                    stored=field_class.stored, numtype=float, field_boost=field_class.boost)
            elif field_class.field_type == 'boolean':
                # Field boost isn't supported on BOOLEAN as of 1.8.2.
                schema_fields[field_class.index_fieldname] = BOOLEAN(
                    stored=field_class.stored)
            elif field_class.field_type == 'ngram':
                schema_fields[field_class.index_fieldname] = NGRAM(
                    minsize=3, maxsize=15, stored=field_class.stored, field_boost=field_class.boost)
            elif field_class.field_type == 'edge_ngram':
                schema_fields[field_class.index_fieldname] = NGRAMWORDS(minsize=2, maxsize=15, at='start',
                                                                        stored=field_class.stored,
                                                                        field_boost=field_class.boost)
            else:
                # schema_fields[field_class.index_fieldname] = TEXT(stored=True, analyzer=StemmingAnalyzer(), field_boost=field_class.boost, sortable=True)
                schema_fields[field_class.index_fieldname] = TEXT(
                    stored=True, analyzer=ChineseAnalyzer(), field_boost=field_class.boost, sortable=True)
            if field_class.document is True:
                content_field_name = field_class.index_fieldname
                schema_fields[field_class.index_fieldname].spelling = True

        # Fail more gracefully than relying on the backend to die if no fields
        # are found.
        if len(schema_fields) <= initial_key_count:
            raise SearchBackendError(
                "No fields were found in any search_indexes. Please correct this before attempting to search.")

        return (content_field_name, Schema(**schema_fields))

    def update(self, index, iterable, commit=True):
        if not self.setup_complete:
            self.setup()

        self.index = self.index.refresh()
        writer = AsyncWriter(self.index)

        for obj in iterable:
            try:
                doc = index.full_prepare(obj)
            except SkipDocument:
                self.log.debug(u"Indexing for object `%s` skipped", obj)
            else:
                # Really make sure it's unicode, because Whoosh won't have it any
                # other way.
                for key in doc:
                    doc[key] = self._from_python(doc[key])

                # Document boosts aren't supported in Whoosh 2.5.0+.
                if 'boost' in doc:
                    del doc['boost']

                try:
                    writer.update_document(**doc)
                except Exception as e:
                    if not self.silently_fail:
                        raise

                    # We'll log the object identifier but won't include the actual object
                    # to avoid the possibility of that generating encoding errors while
                    # processing the log message:
                    self.log.error(
                        u"%s while preparing object for update" %
                        e.__class__.__name__,
                        exc_info=True,
                        extra={
                            "data": {
                                "index": index,
                                "object": get_identifier(obj)}})

        if len(iterable) > 0:
            # For now, commit no matter what, as we run into locking issues
            # otherwise.
            writer.commit()

    def remove(self, obj_or_string, commit=True):
        if not self.setup_complete:
            self.setup()

        self.index = self.index.refresh()
        whoosh_id = get_identifier(obj_or_string)

        try:
            self.index.delete_by_query(
                q=self.parser.parse(
                    u'%s:"%s"' %
                    (ID, whoosh_id)))
        except Exception as e:
            if not self.silently_fail:
                raise

            self.log.error(
                "Failed to remove document '%s' from Whoosh: %s",
                whoosh_id,
                e,
                exc_info=True)

    def clear(self, models=None, commit=True):
        if not self.setup_complete:
            self.setup()

        self.index = self.index.refresh()

        if models is not None:
            assert isinstance(models, (list, tuple))

        try:
            if models is None:
                self.delete_index()
            else:
                models_to_delete = []

                for model in models:
                    models_to_delete.append(
                        u"%s:%s" %
                        (DJANGO_CT, get_model_ct(model)))

                self.index.delete_by_query(
                    q=self.parser.parse(
                        u" OR ".join(models_to_delete)))
        except Exception as e:
            if not self.silently_fail:
                raise

            if models is not None:
                self.log.error(
                    "Failed to clear Whoosh index of models '%s': %s",
                    ','.join(models_to_delete),
                    e,
                    exc_info=True)
            else:
                self.log.error(
                    "Failed to clear Whoosh index: %s", e, exc_info=True)

    def delete_index(self):
        # Per the Whoosh mailing list, if wiping out everything from the index,
        # it's much more efficient to simply delete the index files.
        if self.use_file_storage and os.path.exists(self.path):
            shutil.rmtree(self.path)
        elif not self.use_file_storage:
            self.storage.clean()

        # Recreate everything.
        self.setup()

    def optimize(self):
        if not self.setup_complete:
            self.setup()

        self.index = self.index.refresh()
        self.index.optimize()

    def calculate_page(self, start_offset=0, end_offset=None):
        # Prevent against Whoosh throwing an error. Requires an end_offset
        # greater than 0.
        if end_offset is not None and end_offset <= 0:
            end_offset = 1

        # Determine the page.
        page_num = 0

        if end_offset is None:
            end_offset = 1000000

        if start_offset is None:
            start_offset = 0

        page_length = end_offset - start_offset

        if page_length and page_length > 0:
            page_num = int(start_offset / page_length)

        # Increment because Whoosh uses 1-based page numbers.
        page_num += 1
        return page_num, page_length

    @log_query
    def search(
            self,
            query_string,
            sort_by=None,
            start_offset=0,
            end_offset=None,
            fields='',
            highlight=False,
            facets=None,
            date_facets=None,
            query_facets=None,
            narrow_queries=None,
            spelling_query=None,
            within=None,
            dwithin=None,
            distance_point=None,
            models=None,
            limit_to_registered_models=None,
            result_class=None,
            **kwargs):
        if not self.setup_complete:
            self.setup()

        # A zero length query should return no results.
        if len(query_string) == 0:
            return {
                'results': [],
                'hits': 0,
            }

        query_string = force_str(query_string)

        # A one-character query (non-wildcard) gets nabbed by a stopwords
        # filter and should yield zero results.
        if len(query_string) <= 1 and query_string != u'*':
            return {
                'results': [],
                'hits': 0,
            }

        reverse = False

        if sort_by is not None:
            # Determine if we need to reverse the results and if Whoosh can
            # handle what it's being asked to sort by. Reversing is an
            # all-or-nothing action, unfortunately.
            sort_by_list = []
            reverse_counter = 0

            for order_by in sort_by:
                if order_by.startswith('-'):
                    reverse_counter += 1

            if reverse_counter and reverse_counter != len(sort_by):
                raise SearchBackendError("Whoosh requires all order_by fields"
                                         " to use the same sort direction")

            for order_by in sort_by:
                if order_by.startswith('-'):
                    sort_by_list.append(order_by[1:])

                    if len(sort_by_list) == 1:
                        reverse = True
                else:
                    sort_by_list.append(order_by)

                    if len(sort_by_list) == 1:
                        reverse = False

            sort_by = sort_by_list[0]

        if facets is not None:
            warnings.warn(
                "Whoosh does not handle faceting.",
                Warning,
                stacklevel=2)

        if date_facets is not None:
            warnings.warn(
                "Whoosh does not handle date faceting.",
                Warning,
                stacklevel=2)

        if query_facets is not None:
            warnings.warn(
                "Whoosh does not handle query faceting.",
                Warning,
                stacklevel=2)

        narrowed_results = None
        self.index = self.index.refresh()

        if limit_to_registered_models is None:
            limit_to_registered_models = getattr(
                settings, 'HAYSTACK_LIMIT_TO_REGISTERED_MODELS', True)

        if models and len(models):
            model_choices = sorted(get_model_ct(model) for model in models)
        elif limit_to_registered_models:
            # Using narrow queries, limit the results to only models handled
            # with the current routers.
            model_choices = self.build_models_list()
        else:
            model_choices = []

        if len(model_choices) > 0:
            if narrow_queries is None:
                narrow_queries = set()

            narrow_queries.add(' OR '.join(
                ['%s:%s' % (DJANGO_CT, rm) for rm in model_choices]))

        narrow_searcher = None

        if narrow_queries is not None:
            # Potentially expensive? I don't see another way to do it in
            # Whoosh...
            narrow_searcher = self.index.searcher()

            for nq in narrow_queries:
                recent_narrowed_results = narrow_searcher.search(
                    self.parser.parse(force_str(nq)), limit=None)

                if len(recent_narrowed_results) <= 0:
                    return {
                        'results': [],
                        'hits': 0,
                    }

                if narrowed_results:
                    narrowed_results.filter(recent_narrowed_results)
                else:
                    narrowed_results = recent_narrowed_results

        self.index = self.index.refresh()

        if self.index.doc_count():
            searcher = self.index.searcher()
            parsed_query = self.parser.parse(query_string)

            # In the event of an invalid/stopworded query, recover gracefully.
            if parsed_query is None:
                return {
                    'results': [],
                    'hits': 0,
                }

            page_num, page_length = self.calculate_page(
                start_offset, end_offset)

            search_kwargs = {
                'pagelen': page_length,
                'sortedby': sort_by,
                'reverse': reverse,
            }

            # Handle the case where the results have been narrowed.
            if narrowed_results is not None:
                search_kwargs['filter'] = narrowed_results

            try:
                raw_page = searcher.search_page(
                    parsed_query,
                    page_num,
                    **search_kwargs
                )
            except ValueError:
                if not self.silently_fail:
                    raise

                return {
                    'results': [],
                    'hits': 0,
                    'spelling_suggestion': None,
                }

            # Because as of Whoosh 2.5.1, it will return the wrong page of
            # results if you request something too high. :(
            if raw_page.pagenum < page_num:
                return {
                    'results': [],
                    'hits': 0,
                    'spelling_suggestion': None,
                }

            results = self._process_results(
                raw_page,
                highlight=highlight,
                query_string=query_string,
                spelling_query=spelling_query,
                result_class=result_class)
            searcher.close()

            if hasattr(narrow_searcher, 'close'):
                narrow_searcher.close()

            return results
        else:
            if self.include_spelling:
                if spelling_query:
                    spelling_suggestion = self.create_spelling_suggestion(
                        spelling_query)
                else:
                    spelling_suggestion = self.create_spelling_suggestion(
                        query_string)
            else:
                spelling_suggestion = None

            return {
                'results': [],
                'hits': 0,
                'spelling_suggestion': spelling_suggestion,
            }

    def more_like_this(
            self,
            model_instance,
            additional_query_string=None,
            start_offset=0,
            end_offset=None,
            models=None,
            limit_to_registered_models=None,
            result_class=None,
            **kwargs):
        if not self.setup_complete:
            self.setup()

        # Deferred models will have a different class ("RealClass_Deferred_fieldname")
        # which won't be in our registry:
        model_klass = model_instance._meta.concrete_model

        field_name = self.content_field_name
        narrow_queries = set()
        narrowed_results = None
        self.index = self.index.refresh()

        if limit_to_registered_models is None:
            limit_to_registered_models = getattr(
                settings, 'HAYSTACK_LIMIT_TO_REGISTERED_MODELS', True)

        if models and len(models):
            model_choices = sorted(get_model_ct(model) for model in models)
        elif limit_to_registered_models:
            # Using narrow queries, limit the results to only models handled
            # with the current routers.
            model_choices = self.build_models_list()
        else:
            model_choices = []

        if len(model_choices) > 0:
            if narrow_queries is None:
                narrow_queries = set()

            narrow_queries.add(' OR '.join(
                ['%s:%s' % (DJANGO_CT, rm) for rm in model_choices]))

        if additional_query_string and additional_query_string != '*':
            narrow_queries.add(additional_query_string)

        narrow_searcher = None

        if narrow_queries is not None:
            # Potentially expensive? I don't see another way to do it in
            # Whoosh...
            narrow_searcher = self.index.searcher()

            for nq in narrow_queries:
                recent_narrowed_results = narrow_searcher.search(
                    self.parser.parse(force_str(nq)), limit=None)

                if len(recent_narrowed_results) <= 0:
                    return {
                        'results': [],
                        'hits': 0,
                    }

                if narrowed_results:
                    narrowed_results.filter(recent_narrowed_results)
                else:
                    narrowed_results = recent_narrowed_results

        page_num, page_length = self.calculate_page(start_offset, end_offset)

        self.index = self.index.refresh()
        raw_results = EmptyResults()

        if self.index.doc_count():
            query = "%s:%s" % (ID, get_identifier(model_instance))
            searcher = self.index.searcher()
            parsed_query = self.parser.parse(query)
            results = searcher.search(parsed_query)

            if len(results):
                raw_results = results[0].more_like_this(
                    field_name, top=end_offset)

            # Handle the case where the results have been narrowed.
            if narrowed_results is not None and hasattr(raw_results, 'filter'):
                raw_results.filter(narrowed_results)

        try:
            raw_page = ResultsPage(raw_results, page_num, page_length)
        except ValueError:
            if not self.silently_fail:
                raise

            return {
                'results': [],
                'hits': 0,
                'spelling_suggestion': None,
            }

        # Because as of Whoosh 2.5.1, it will return the wrong page of
        # results if you request something too high. :(
        if raw_page.pagenum < page_num:
            return {
                'results': [],
                'hits': 0,
                'spelling_suggestion': None,
            }

        results = self._process_results(raw_page, result_class=result_class)
        searcher.close()

        if hasattr(narrow_searcher, 'close'):
            narrow_searcher.close()

        return results

    def _process_results(
            self,
            raw_page,
            highlight=False,
            query_string='',
            spelling_query=None,
            result_class=None):
        from haystack import connections
        results = []

        # It's important to grab the hits first before slicing. Otherwise, this
        # can cause pagination failures.
        hits = len(raw_page)

        if result_class is None:
            result_class = SearchResult

        facets = {}
        spelling_suggestion = None
        unified_index = connections[self.connection_alias].get_unified_index()
        indexed_models = unified_index.get_indexed_models()

        for doc_offset, raw_result in enumerate(raw_page):
            score = raw_page.score(doc_offset) or 0
            app_label, model_name = raw_result[DJANGO_CT].split('.')
            additional_fields = {}
            model = haystack_get_model(app_label, model_name)

            if model and model in indexed_models:
                for key, value in raw_result.items():
                    index = unified_index.get_index(model)
                    string_key = str(key)

                    if string_key in index.fields and hasattr(
                            index.fields[string_key], 'convert'):
                        # Special-cased due to the nature of KEYWORD fields.
                        if index.fields[string_key].is_multivalued:
                            if value is None or len(value) == 0:
                                additional_fields[string_key] = []
                            else:
                                additional_fields[string_key] = value.split(
                                    ',')
                        else:
                            additional_fields[string_key] = index.fields[string_key].convert(
                                value)
                    else:
                        additional_fields[string_key] = self._to_python(value)

                del (additional_fields[DJANGO_CT])
                del (additional_fields[DJANGO_ID])

                if highlight:
                    sa = StemmingAnalyzer()
                    formatter = WhooshHtmlFormatter('em')
                    terms = [token.text for token in sa(query_string)]

                    whoosh_result = whoosh_highlight(
                        additional_fields.get(self.content_field_name),
                        terms,
                        sa,
                        ContextFragmenter(),
                        formatter
                    )
                    additional_fields['highlighted'] = {
                        self.content_field_name: [whoosh_result],
                    }

                result = result_class(
                    app_label,
                    model_name,
                    raw_result[DJANGO_ID],
                    score,
                    **additional_fields)
                results.append(result)
            else:
                hits -= 1

        if self.include_spelling:
            if spelling_query:
                spelling_suggestion = self.create_spelling_suggestion(
                    spelling_query)
            else:
                spelling_suggestion = self.create_spelling_suggestion(
                    query_string)

        return {
            'results': results,
            'hits': hits,
            'facets': facets,
            'spelling_suggestion': spelling_suggestion,
        }

    def create_spelling_suggestion(self, query_string):
        spelling_suggestion = None
        reader = self.index.reader()
        corrector = reader.corrector(self.content_field_name)
        cleaned_query = force_str(query_string)

        if not query_string:
            return spelling_suggestion

        # Clean the string.
        for rev_word in self.RESERVED_WORDS:
            cleaned_query = cleaned_query.replace(rev_word, '')

        for rev_char in self.RESERVED_CHARACTERS:
            cleaned_query = cleaned_query.replace(rev_char, '')

        # Break it down.
        query_words = cleaned_query.split()
        suggested_words = []

        for word in query_words:
            suggestions = corrector.suggest(word, limit=1)

            if len(suggestions) > 0:
                suggested_words.append(suggestions[0])

        spelling_suggestion = ' '.join(suggested_words)
        return spelling_suggestion

    def _from_python(self, value):
        """
        Converts Python values to a string for Whoosh.

        Code courtesy of pysolr.
        """
        if hasattr(value, 'strftime'):
            if not hasattr(value, 'hour'):
                value = datetime(value.year, value.month, value.day, 0, 0, 0)
        elif isinstance(value, bool):
            if value:
                value = 'true'
            else:
                value = 'false'
        elif isinstance(value, (list, tuple)):
            value = u','.join([force_str(v) for v in value])
        elif isinstance(value, (six.integer_types, float)):
            # Leave it alone.
            pass
        else:
            value = force_str(value)
        return value

    def _to_python(self, value):
        """
        Converts values from Whoosh to native Python values.

        A port of the same method in pysolr, as they deal with data the same way.
        """
        if value == 'true':
            return True
        elif value == 'false':
            return False

        if value and isinstance(value, six.string_types):
            possible_datetime = DATETIME_REGEX.search(value)

            if possible_datetime:
                date_values = possible_datetime.groupdict()

                for dk, dv in date_values.items():
                    date_values[dk] = int(dv)

                return datetime(
                    date_values['year'],
                    date_values['month'],
                    date_values['day'],
                    date_values['hour'],
                    date_values['minute'],
                    date_values['second'])

        try:
            # Attempt to use json to load the values.
            converted_value = json.loads(value)

            # Try to handle most built-in types.
            if isinstance(
                    converted_value,
                    (list,
                     tuple,
                     set,
                     dict,
                     six.integer_types,
                     float,
                     complex)):
                return converted_value
        except BaseException:
            # If it fails (SyntaxError or its ilk) or we don't trust it,
            # continue on.
            pass

        return value


class WhooshSearchQuery(BaseSearchQuery):
    def _convert_datetime(self, date):
        if hasattr(date, 'hour'):
            return force_str(date.strftime('%Y%m%d%H%M%S'))
        else:
            return force_str(date.strftime('%Y%m%d000000'))

    def clean(self, query_fragment):
        """
        Provides a mechanism for sanitizing user input before presenting the
        value to the backend.

        Whoosh 1.X differs here in that you can no longer use a backslash
        to escape reserved characters. Instead, the whole word should be
        quoted.
        """
        words = query_fragment.split()
        cleaned_words = []

        for word in words:
            if word in self.backend.RESERVED_WORDS:
                word = word.replace(word, word.lower())

            for char in self.backend.RESERVED_CHARACTERS:
                if char in word:
                    word = "'%s'" % word
                    break

            cleaned_words.append(word)

        return ' '.join(cleaned_words)

    def build_query_fragment(self, field, filter_type, value):
        from haystack import connections
        query_frag = ''
        is_datetime = False

        if not hasattr(value, 'input_type_name'):
            # Handle when we've got a ``ValuesListQuerySet``...
            if hasattr(value, 'values_list'):
                value = list(value)

            if hasattr(value, 'strftime'):
                is_datetime = True

            if isinstance(value, six.string_types) and value != ' ':
                # It's not an ``InputType``. Assume ``Clean``.
                value = Clean(value)
            else:
                value = PythonData(value)

        # Prepare the query using the InputType.
        prepared_value = value.prepare(self)

        if not isinstance(prepared_value, (set, list, tuple)):
            # Then convert whatever we get back to what pysolr wants if needed.
            prepared_value = self.backend._from_python(prepared_value)

        # 'content' is a special reserved word, much like 'pk' in
        # Django's ORM layer. It indicates 'no special field'.
        if field == 'content':
            index_fieldname = ''
        else:
            index_fieldname = u'%s:' % connections[self._using].get_unified_index(
            ).get_index_fieldname(field)

        filter_types = {
            'content': '%s',
            'contains': '*%s*',
            'endswith': "*%s",
            'startswith': "%s*",
            'exact': '%s',
            'gt': "{%s to}",
            'gte': "[%s to]",
            'lt': "{to %s}",
            'lte': "[to %s]",
            'fuzzy': u'%s~',
        }

        if value.post_process is False:
            query_frag = prepared_value
        else:
            if filter_type in [
                'content',
                'contains',
                'startswith',
                'endswith',
                'fuzzy']:
                if value.input_type_name == 'exact':
                    query_frag = prepared_value
                else:
                    # Iterate over terms & incorportate the converted form of
                    # each into the query.
                    terms = []

                    if isinstance(prepared_value, six.string_types):
                        possible_values = prepared_value.split(' ')
                    else:
                        if is_datetime is True:
                            prepared_value = self._convert_datetime(
                                prepared_value)

                        possible_values = [prepared_value]

                    for possible_value in possible_values:
                        terms.append(
                            filter_types[filter_type] %
                            self.backend._from_python(possible_value))

                    if len(terms) == 1:
                        query_frag = terms[0]
                    else:
                        query_frag = u"(%s)" % " AND ".join(terms)
            elif filter_type == 'in':
                in_options = []

                for possible_value in prepared_value:
                    is_datetime = False

                    if hasattr(possible_value, 'strftime'):
                        is_datetime = True

                    pv = self.backend._from_python(possible_value)

                    if is_datetime is True:
                        pv = self._convert_datetime(pv)

                    if isinstance(pv, six.string_types) and not is_datetime:
                        in_options.append('"%s"' % pv)
                    else:
                        in_options.append('%s' % pv)

                query_frag = "(%s)" % " OR ".join(in_options)
            elif filter_type == 'range':
                start = self.backend._from_python(prepared_value[0])
                end = self.backend._from_python(prepared_value[1])

                if hasattr(prepared_value[0], 'strftime'):
                    start = self._convert_datetime(start)

                if hasattr(prepared_value[1], 'strftime'):
                    end = self._convert_datetime(end)

                query_frag = u"[%s to %s]" % (start, end)
            elif filter_type == 'exact':
                if value.input_type_name == 'exact':
                    query_frag = prepared_value
                else:
                    prepared_value = Exact(prepared_value).prepare(self)
                    query_frag = filter_types[filter_type] % prepared_value
            else:
                if is_datetime is True:
                    prepared_value = self._convert_datetime(prepared_value)

                query_frag = filter_types[filter_type] % prepared_value

        if len(query_frag) and not isinstance(value, Raw):
            if not query_frag.startswith('(') and not query_frag.endswith(')'):
                query_frag = "(%s)" % query_frag

        return u"%s%s" % (index_fieldname, query_frag)

        # if not filter_type in ('in', 'range'):
        #     # 'in' is a bit of a special case, as we don't want to
        #     # convert a valid list/tuple to string. Defer handling it
        #     # until later...
        #     value = self.backend._from_python(value)


class WhooshEngine(BaseEngine):
    backend = WhooshSearchBackend
    query = WhooshSearchQuery

五，项目总结

对于博客系统来讲，用JAVA开发的较多，Python开发的相对较少，功能完整又比较全面的更是不多，这个系统做的整体功能完整，界面简洁大方，使用了较新的组件和技术框架，相对比较优秀。