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我有这个模型管理员-

class NewsAdmin(ImageWidgetAdmin):
    image_fields = ['featured_image']
    list_per_page = 20
    list_display = ('heading', 'category', 'status', 'is_active', 'created_at', 'published_at',
                    'created_by', 'published_by')
    list_editable = ('category', 'status', 'is_active')
    list_filter = ('published_at', 'created_at', 'status', 'is_active', 'created_by',
                   'published_by',)
    search_fields = ('heading', 'category', 'tags', 'source')
    actions = [enable_object, disable_object, status_draft, status_private, status_public]
    actions_on_bottom = True

加载最多只需 400 毫秒。这是 django-debug-toolbar 图像 -

没有 get_queryset 的 djdt 图像

但是当我覆盖语言过滤对象的 get_queryset 方法时 -

    def get_queryset(self, request):
        queryset = super(NewsAdmin, self).get_queryset(request)
        return queryset.filter(language=request.LANGUAGE_CODE)

大约需要 17-18 秒，这太疯狂了！！这是 django-debug-toolbar 图像 -

带有 get_queryset 的 djdt 图像

甚至前端查询也会发生同样的情况！有关详细信息 - 我有大约 40 万条记录的数据库表，这是模型 -

class News(BaseEntityBasicAbstract, HitCountMixin):
    NEWS_STATUS = (
        ('draft', _('Draft')),
        ('pending', _('Pending')),
        ('review', _('Review')),
        ('public', _('Public')),
        ('private', _('Private'))
    )
    backup = models.BooleanField(default=False)
    prev_id = models.BigIntegerField(null=True, blank=True)
    language = models.CharField(max_length=10, choices=LANGUAGES, default='bn')
    heading = models.CharField(max_length=255, null=True, blank=True,
                               verbose_name=_('News Heading'),
                               help_text=_('Provide a news heading/caption.'))
    sub_caption = models.TextField(max_length=255, null=True, blank=True,
                                   verbose_name=_('Summary'),
                                   help_text=_('Provide summary of the news.'))
    url = models.CharField(max_length=255, unique=True, verbose_name=_('URL/Slug/Link'),
                           help_text=_('Unique url for the news without whitspace.'))
    content = HTMLField(null=True, blank=True, verbose_name=_('Content'),
                        help_text=_('HTML content with texts, links & images.'))
    featured_image = models.FileField(upload_to=FilePrefix('news/'), null=True, blank=True,
                                      verbose_name=_('Featured Image'),
                                      help_text=_('Upload a featured image for news.'))
    image_caption = models.TextField(max_length=255, null=True, blank=True,
                                     verbose_name=_('Image Caption'),
                                     help_text=_('Provide a image caption.'))
    status = models.CharField(max_length=20, choices=NEWS_STATUS, default='pending',
                              verbose_name=_('News Status'),
                              help_text=_('Only public news can be seen on front end.'))
    source = models.ForeignKey(NewsSource, on_delete=models.SET_NULL, null=True, blank=True,
                               verbose_name=_('News Source'),
                               help_text=_('Select a news source.'))
    category = models.ForeignKey(Category, on_delete=models.SET_NULL, null=True, blank=True,
                                 verbose_name=_('Category'),
                                 help_text=_('Select a news category.'))
    tags = tagulous.models.TagField(
        blank=True,
        to=Tags,
        verbose_name=_('News Tags'),
        help_text=_('Provide news tags separated with commas.')
    )
    published_at = models.DateTimeField(null=True, blank=True,
                                        verbose_name=_('Published At'))
    menu_items = GenericRelation(MenuItems, object_id_field='id',
                                 related_query_name='news_as_menu')
    hit_count_generic = GenericRelation(HitCount, object_id_field='object_pk',
                                        related_query_name='news_hit_count')
    created_by = models.ForeignKey(User, related_name='news_created_by',
                                   on_delete=models.SET_NULL, null=True, blank=True,
                                   verbose_name=_('Created By'))
    updated_by = models.ForeignKey(User, related_name='news_updated_by',
                                   on_delete=models.SET_NULL, null=True, blank=True,
                                   verbose_name=_('Last Updated By'))
    published_by = models.ForeignKey(User, related_name='news_published_by',
                                     on_delete=models.SET_NULL, null=True, blank=True,
                                     verbose_name=_('Published By'))
    deleted_by = models.ForeignKey(User, related_name='news_deleted_by',
                                   on_delete=models.SET_NULL, null=True, blank=True,
                                   verbose_name=_('Deleted By'))

我迷路了，为什么会这样！请帮我解决这里的问题！

4

1 回答 1

1

您正在过滤没有索引的字段。表越大，数据库扫描每一行所需的时间就越长。更改您的字段定义以允许索引并处理迁移。

language = models.CharField(max_length=10, choices=LANGUAGES, default='bn' db_index=True)
于 2020-06-02T06:40:44.917 回答