Django-rest-framework多条件查询/分页/多表Json
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Django-rest-framework多条件查询/分页/多表Json
django-rest-framework多条件查询需要覆写ListAPIView.get_queryset方法,代码示例:
def get_queryset(self): """ 使用request.query_params实现多条件查询,也可以使用django filter ,较简单的 方法是在filter_fields中指定要过滤的字段,但只能表示等值,不灵活,灵活的方式是 使用FilterSet,如下示例: class ProductFilter(django_filters.rest_framework.FilterSet): min_price = django_filters.NumberFilter(name="price", lookup_expr=‘gte‘) max_price = django_filters.NumberFilter(name="price", lookup_expr=‘lte‘) class Meta: model = Product fields = [‘category‘, ‘in_stock‘, ‘min_price‘, ‘max_price‘] class ProductList(generics.ListAPIView): queryset = Product.objects.all() serializer_class = ProductSerializer filter_backends = (django_filters.rest_framework.DjangoFilterBackend,) filter_class = ProductFilter """ queryset = Snippet.objects.all() title = self.request.query_params.get(‘title‘, None) language = self.request.query_params.get(‘language‘, None) style = self.request.query_params.get(‘style‘, None) aQ = Q() if title is not None: aQ.add(Q(title__startswith=title), Q.AND) if language is not None: aQ.add(Q(language=language), Q.AND) if style is not None: aQ.add(Q(style=style), Q.AND) queryset = queryset.filter(aQ).order_by("-id") return queryset
至于分页,只需要在View中指定分页类,或者在settings.py中指定
pagination_class = StandardResultsSetPagination #或setting.py REST_FRAMEWORK = { ‘DEFAULT_PAGINATION_CLASS‘: ‘rest_framework.pagination.PageNumberPagination‘, ‘PAGE_SIZE‘: 100}
涉及到多表的Json,重新编写Serializer,附加上所需要的字段,在View中使用新的Serializer。
‘‘‘ 关于Serializer,一般情况下,一个实体(Model)对应一个Serializer; 在涉及到表关联查询显示时,可以额外编写Serializer,包含关联表中 所需要的字段。 ‘‘‘ class SnippetJoinUserSerializer(ModelSerializer): owner = serializers.ReadOnlyField(source=‘owner.username‘) email = serializers.ReadOnlyField(source=‘owner.email‘) user_id = serializers.ReadOnlyField(source=‘owner.id‘) last_login = serializers.ReadOnlyField(source=‘owner.last_login‘) class Meta: model = Snippet fields = (‘id‘, ‘title‘, ‘code‘, ‘linenos‘, ‘language‘, ‘style‘, ‘owner‘, ‘email‘,‘user_id‘,‘last_login‘)
输出结果就是包含了user信息的Json。
GET /snippet_join_users/ HTTP 200 OK Allow: GET, HEAD, OPTIONS Content-Type: application/json Vary: Accept { "count": 8, "next": "http://127.0.0.1:8000/snippet_join_users/?page=2", "previous": null, "results": [ { "id": 8, "title": "test8", "code": "test", "linenos": false, "language": "abap", "style": "algol", "owner": "admin", "email": "[email protected]", "user_id": 1, "last_login": "2016-12-11T03:50:40.909685Z" }, { "id": 7, "title": "test7", "code": "test", "linenos": false, "language": "abap", "style": "algol", "owner": "admin", "email": "[email protected]", "user_id": 1, "last_login": "2016-12-11T03:50:40.909685Z" }, { "id": 6, "title": "test6", "code": "test", "linenos": false, "language": "abap", "style": "algol", "owner": "admin", "email": "[email protected]", "user_id": 1, "last_login": "2016-12-11T03:50:40.909685Z" }, { "id": 5, "title": "test5", "code": "test", "linenos": false, "language": "abap", "style": "algol", "owner": "admin", "email": "[email protected]", "user_id": 1, "last_login": "2016-12-11T03:50:40.909685Z" }, { "id": 4, "title": "test4", "code": "test", "linenos": false, "language": "abap", "style": "algol", "owner": "admin", "email": "[email protected]", "user_id": 1, "last_login": "2016-12-11T03:50:40.909685Z" } ] }
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