CODEWITHSUNDEEP
pythondjangographene-python
Tomek Buszewski
Tomek Buszewski

Reputation: 7935

Django/Graphene mutations doesn't apply

I am currently creating a GraphQL interface for my Django app, using Python-Graphene. While queries works great, mutations - not quite.

The model for Ingredient:

class Ingredient(models.Model):
    name = models.CharField(max_length=255)
    slug = models.SlugField(editable=False)
    needs_refill = models.BooleanField(default=False)
    created = models.DateTimeField('created', auto_now_add=True)
    modified = models.DateTimeField('modified', auto_now=True)

    def __str__(self):
        return self.name

    def save(self, *args, **kwargs):
        self.slug = slugify(self.name)
        super(Ingredient, self).save(*args, **kwargs)

Here's the schema code (full code here: https://ctrlv.it/id/107369/1044410281):

class IngredientType(DjangoObjectType):
    class Meta:
        model = Ingredient

...

class CreateIngredient(Mutation):
    class Arguments:
        name = String()

    ok = Boolean()
    ingredient = Field(IngredientType)

    def mutate(self, info, name):
        ingredient = IngredientType(name=name)
        ok = True
        return CreateIngredient(ingredient=ingredient, ok=ok)


class MyMutations(ObjectType):
    create_ingredient = CreateIngredient.Field()


schema = Schema(query=Query, mutation=MyMutations)

and my mutation:

mutation {
  createIngredient(name:"Test") {
    ingredient {
      name
    }
    ok
  }
}

Running it returns proper object and ok is True, but no data is pushed to the database. What should I do? What did I miss?

Upvotes: 3

Views: 2422

Answers (1)

Mark Chackerian
Mark Chackerian

Reputation: 23512

Close...inside your mutate method you need to save your ingredient as an instance of Ingredient (not IngredientType) and then use that to create your IngredientType object. Also, you should declare mutate as @staticmethod. Something like:

    @staticmethod
    def mutate(root, info, name):
        ingredient = Ingredient.objects.create(name=name)
        ok = True
        return CreateIngredient(ingredient=ingredient, ok=ok)

Upvotes: 4

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