Inconsistent behavior for ID field doing update in DjangoModelFormMutation

ID field in DjangoModelFormMutation displaying Global ID, however doing updates form id requires raw DB pk field.

Say I have below scripts

# cookbook/ingredients/models.py
from django.db import models
class Category(models.Model):
    name = models.CharField(max_length=100)

    def __str__(self):
        return self.name

# cookbook/ingredients/forms.py
from django.forms.models import ALL_FIELDS, ModelForm
from cookbook.ingredients.models import Category

class CategoryForm(ModelForm):
    class Meta:
        model = Category
        fields = ALL_FIELDS

# cookbook/ingredients/schema.py
from graphene import Field, Node, ObjectType
from graphene_django.filter import DjangoFilterConnectionField
from graphene_django.forms.mutation import DjangoModelFormMutation
from graphene_django.types import DjangoObjectType

from cookbook.ingredients.forms import CategoryForm
from cookbook.ingredients.models import Category

class CategoryNode(DjangoObjectType):
    class Meta:
        model = Category
        interfaces = (Node,)
        filter_fields = ["name", "ingredients"]

class Queries(ObjectType):
    category = Node.Field(CategoryNode)
    all_categories = DjangoFilterConnectionField(CategoryNode)

class CategoryMutation(DjangoModelFormMutation):
    category = Field(CategoryNode)

    class Meta:
        form_class = CategoryForm

class Mutations(ObjectType):
    category_form_create = CategoryMutation.Field()
    category_form_update = CategoryMutation.Field()

while I do query allCategories like this

query {
  allCategories {
    edges {
      node {
        id
        name
      }
    }
  }
}

result as below

{
  "data": {
    "allCategories": {
      "edges": [
        {
          "node": {
            "id": "Q2F0ZWdvcnlOb2RlOjE=", // global id
            "name": "Dairy"
          }
        },
        {
          "node": {
            "id": "Q2F0ZWdvcnlOb2RlOjI=", // global id
            "name": "Meat"
          }
        }
      ]
    }
  }
}

above are expected

Now I would like to do some update

# query part
mutation xxx($formInput: CategoryMutationInput!) {
  categoryFormUpdate (input: $formInput){
    category {
      id
      name
    }
  }
}

// variables part
{
  "formInput": {
    "id": "Q2F0ZWdvcnlOb2RlOjE=", // <- using global id
    "name": "Diary 1"
  }
}

I got errors sth like Field 'id' expected a number but got 'Q2F0ZWdvcnlOb2RlOjE='.
so I decode this Q2F0ZWdvcnlOb2RlOjE= and get this CategoryNode:1 string

and then I change the id to raw DB pk in variables part

// variables part
{
  "formInput": {
    "id": 1, // <- using raw DB pk
    "name": "Diary 1"
  }
}

I got the expected result

{
  "data": {
    "categoryFormUpdate": {
      "category": {
        "id": "Q2F0ZWdvcnlOb2RlOjU=", // <- global id
        "name": "Diary 1"
      }
    }
  }
}

Is this behavior expected?
I think this is confusing and inconsistent (should be always global id, I think). Shouldn’t it be mentioned in the doc? Or Is it a bug?

[zbyte64]

Also related to PR #546 which was closed due to inactivity

[pfcodes]

Anybody come up with a solution to this? Thinking I might just manually convert from the Global ID to the pk in perform_mutate