Using json model field with django graphene

问题

I'm working with graphql endpoint for my project. One of models has textfield which contains some json. If i request list of my entities via graphql, I'm getting this json like a string. How to reach ability to use it in graphql as nested structure with ability of filtering, choosing some properties etc.

class SysObjects(models.Model):
    id = models.BigAutoField(primary_key=True)
    user_id = models.BigIntegerField()
    type_id = models.PositiveIntegerField(blank=True, null=True)
    # status = models.ForeignKey('SysObjectsStatuses', models.DO_NOTHING, blank=True, null=True)
    title = models.CharField(max_length=255, blank=True, null=True)
    data = models.TextField(blank=True, null=True) #json string is here
    visible = models.IntegerField()
    date_actual = models.DateTimeField()
    date_update = models.DateTimeField(blank=True, null=True)
    date_add = models.DateTimeField(blank=True, null=True)
    orig = models.CharField(max_length=255, blank=True, null=True)
    is_color = models.PositiveIntegerField()

    class Meta:
        managed = False
        db_table = 'sys_objects'
        app_label = "default"

    def __str__(self):
        return self.title

回答1:

You can declare resolver for data field with a custom type, e.g.

import graphene
from graphene.django.types import DjangoObjectType

class SysObjectsType(DjangoObjectType):
    data = DataType()

    class Meta:
        model = SysObjects

    def resolve_data(self, info):
        # What you return here depends on how you are unpacking the JSON data
        return self.data

class DataType(graphene.ObjectType):
    # What you put here depends on how you want to structure the JSON output
    ...

You might be able to extend this idea for DataType data to return DataType data, and thus be able to handle arbitrarily deep trees of data.

来源：https://stackoverflow.com/questions/51065178/using-json-model-field-with-django-graphene