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"
}
]
}