How to return List of QuerySets in graphql query as separate list elements?

Question

The problem I am facing is that I have custom_filter of MyModel which return the list of <QuerySet> like

[<QuerySet [<MyModel: xyz>]>, <QuerySet [<MyModel: xyz>, <MyModel: xyz>,<MyModel: xyz>]>]

The object type

class MyModelNode(DjangoObjectType):
    class Meta:
        model=MyModel
        filter_fields=['id]
        interfaces = (graphene.relay.Node,)

Query

class Query(graphene.ObjectType):
   my_model_items = graphene.List(MyModelNode)

   def resolve_my_model_items(self, info, **kwargs):
      my_model_filtered_items = MyModel.objects.custom_filter(kwargs)
      # my_model_filtered_items holds the list of querysets
      return my_model_filtered_items

How to handle list of querysets. The graphql respone of the query should give a list which have the querysets as elements.

[
  {
  //These are from first <QuerySet>
  "myModelItems":[
      {
        "fieldsIaskedFor":"response"
      }
    ]

  },


  {
  //These are from second <QuerySet>
  "myModelItems":[
      {
        "fieldsIaskedFor":"resp"
      },
      {
        "fieldsIaskedFor":"resp"
      },
      {
        "fieldsIaskedFor":"resp"
      },
    ]

  },


]

How to get results of different querysets in separate list elements ? The number of <QuerySet> are not fixed.

What I have to do to achieve that ?.

user10095818 · Accepted Answer · 2019-07-04T16:00:12.543

This can be done by creating two object types and simply nesting one inside other.

The first object type will be the DjangoObjectType of MyModel

class DjangoMyModelNode(DjangoObjectType):
    class Meta:
        model = MyModel
        filter_fields = ['id']
        interfaces = (graphene.relay.Node,)

The second objects type will be a custom ObjectType

class MyModelNode(graphene.ObjectType):
    my_model_items = graphene.List(DjangoMyModelNode)

    def resolve_my_model_items(self, info, **kwargs):
        return self

The query will remain the same

class Query(graphene.ObjectType):
    my_model_items = graphene.List(MyModelNode)

    def resolve_my_model_items(self, info, **kwargs):
        my_model_filtered_items = MyModel.objects.custom_filter(kwargs)
        # my_model_filtered_items holds the list of querysets
        return my_model_filtered_items

This will return things according to desired result

How to return List of QuerySets in graphql query as separate list elements?

1 Answers1