AssertionError: Found different types with the same name in the schema

[Rafik-Belkadi]

I have two Classes Products and SalableProducts in my Models (SalableProducts inherits from Products so it has every field of it's database), in my Schema here is what i did

class  Product(SQLAlchemyObjectType):
    class Meta:
        model = ProductModel
        interfaces = (relay.Node, )
        
class ProductConnections(relay.Connection):
    class Meta:
        node = Product

class  SalableProduct(SQLAlchemyObjectType):
    class Meta:
        model = SalableProductModel
        interfaces = (relay.Node, )

class  SalableProductConnections(relay.Connection):
    class Meta:
        node = SalableProduct

and here is my Query class :

class Query(graphene.ObjectType):
    node = relay.Node.Field()
    all_products = SQLAlchemyConnectionField(ProductConnections)
    all_salable_products = SQLAlchemyConnectionField(SalableProductConnections)  

When i run my server i got this error :

AssertionError: Found different types with the same name in the schema: product_status, product_status.

[Cito]

Is product_status an enum?

[Rafik-Belkadi]

Is product_status an enum?

Yes it is in my mixin

[Cito]

Then it's the known problem for which I have proposed a solution in #210. It happens when you use the same enum in different columns (or maybe in your case, in a class and a subclass). The enum type is not reused, but created twice with the same name.

[Rafik-Belkadi]

I really could not get to apply your solutions, could you please provide some details, saw your latest commits on improving Enum type creation but can't use it at the moment. is there a quick fix i can try ?

Then it's the known problem for which I have proposed a solution in #210. It happens when you use the same enum in different columns (or maybe in your case, in a class and a subclass). The enum type is not reused, but created twice with the same name.

[Cito]

You would probably need to somehow patch the SalableProduct to make it use the same enum, when using the current version of graphene-sqlalchemy. I expect the fix will be merged and released soon.

[rdemetrescu]

I use this monkey-patch on my projects:

from functools import lru_cache

graphene.Enum.from_enum = lru_cache(maxsize=None)(graphene.Enum.from_enum)

[allardhoeve]

That is... really creative! Thanks!

[lungati]

Your code is not in release 2.2.0..

[richin13]

I'm running into this issue. I defined my model like this:

class MyModel(db.Model):
    status_before = db.Column(db.Enum(AdStatus), nullable=False)
    status_during = db.Column(db.Enum(AdStatus), nullable=False)

Which fails with:

AssertionError

AssertionError: Found different types with the same name in the schema: AdStatus, AdStatus.

Versions:

flask-graphql       2.0.0   Adds GraphQL support to your Flask application
graphene            2.1.8   GraphQL Framework for Python
graphene-sqlalchemy 2.2.2   Graphene SQLAlchemy integration
graphql-core        2.2.1   GraphQL implementation for Python
graphql-relay       2.0.0   Relay implementation for Python
graphql-server-core 1.1.1   GraphQL Server tools for powering your server

[danjenson]

I am also getting this error using the same Enum in various SQLAlchemy models.

[danjenson]

So, for the record, I solved this by making global SQLAlchemy types, so @richin13 , your code would become:

SA_AdStatus = db.Enum(AdStatus)

class MyModel(db.Model):
    status_before = db.Column(SA_AdStatus, nullable=False)
    status_during = db.Column(SA_AdStatus, nullable=False)

[spacether]

This problem is caused by multiple enum classes being created with the same definition.
Graphene sees them as different classes with the same name.
You can solve it in one of two ways:

1. by defining the enum class once, then using that defined class at all locations.
2. use the suggested lru_cache as a wrapper around the class creation to do the same thing

We ran into this problem when creating a custom scalar type and using it in multiple locations.
lru_cache wrapping around our returned class solved the problem for us.

[rdemetrescu]

This problem is caused by multiple enum classes being created with the same definition.
Graphene sees them as different classes with the same name.
You can solve it in one of two ways:

1. by defining the enum class once, then using that defined class at all locations.
2. use the suggested lru_cache as a wrapper around the class creation to do the same thing

We ran into this problem when creating a custom scalar type and using it in multiple locations.
lru_cache wrapping around our returned class solved the problem for us.

when you say "wrapping around our returned class" you don't mean you are using the lru_cache multiple times in your project, right?

The lru_cache hack I suggested should be used only once before your SQLAlchemy models are declared. If your model declarations are spread among multiple files, you don't need to write graphene.Enum.from_enum = lru_cache(maxsize=None)(graphene.Enum.from_enum) on each file.

[spacether]

Yes, I mean one code location for both solutions.
Not multiple locations. Only one location uses lru_cache.

[lungati]

I notice sqlalchemy_utils enum is being converted to graphene enum type.

• 1. This section of code is triggered multiple times:
     def from_enum( cls, enum, description=None, deprecation_reason=None ): # noqa: N805 description = description or enum.__doc__ meta_dict = { "enum": enum, "description": description, "deprecation_reason": deprecation_reason, } meta_class = type("Meta", (object,), meta_dict) return type(meta_class.enum.__name__, (Enum,), {"Meta": meta_class})

-2 Here.. Not sure if this is triggered automatically:
@convert_sqlalchemy_type.register(types.Enum) def convert_enum_to_enum(type, column, registry=None): return lambda: enum_for_sa_enum(type, registry or get_global_registry())

N.B: My models include this section: business_domain = Column(Enum(BusinessDomain), nullable=False)

-3 And here... I trigger the same code here because I need to list the values of the enum. Commenting out this section resolves the issue but I need this list of values!
graphene.List(graphene.Enum.from_enum(BusinessDomain))

Noticed the LRU cache fix above won't help if you have different enums