Registering additional types

Currently, only built in model field types are supported.

If you try to use alternative field types (such as currency fields provided by https://github.com/django-money/django-money), they cause this error:

web_1  |   File "/usr/local/lib/python3.5/site-packages/graphene_django/converter.py", line 58, in convert_django_field
web_1  |     (field, field.__class__))
web_1  | Exception: Don't know how to convert the Django field renting.RenterProfile.phone_number (<class 'phonenumber_field.modelfields.PhoneNumberField'>)

There should probably be some API exposed to register conversions for additional field types. (Or if this is already possible, explain it in the docs.)

[clint74]

@reinierpd I was getting this error and as a workaround I had to import my schema only after registering my CustomField converter.

If I put this line import cookbook.schema in the imports section the will raise the error again.

import graphene
from graphene_django.converter import convert_django_field, convert_field_to_string
from geoposition.fields import GeopositionField

@convert_django_field.register(GeopositionField)
def convert_geofield_to_string(field, registry=None):
     return graphene.String(description=field.help_text, required=not field.null)

import cookbook.schema

class Query(cookbook.schema.Query, graphene.ObjectType):
    # This class extends all abstract apps level Queries and graphene.ObjectType
    pass

schema = graphene.Schema(query=Query)

[marbont]

I think I found a solution registering the custom field in schema.py immediately below the last import. F.i. if you need to register CustomField in the cookbook example you should have something like this:

import cookbook.ingredients.schema
import graphene
from graphene_django.converter import convert_django_field

from graphene_django.debug import DjangoDebug

@convert_django_field.register(CustomField)
def my_convert_function(field, registry=None):
    # Customization here
    return something


class Query(cookbook.ingredients.schema.Query, graphene.ObjectType):
    debug = graphene.Field(DjangoDebug, name='__debug')


schema = graphene.Schema(query=Query)

It seems working, but since there’s no documentation about this it could be terribly wrong.