flask_sqlalchemy example : different types with the same name in the schema: EmployeeConnection, EmployeeConnection.

Hi,

I followed the instruction to use the flask_sqlalchemy example with a Python 2.7 version, when I run the app.py script, I’ve got the following error :

(py27) λ python app.py                                                                                                                      
Traceback (most recent call last):                                                                                                          
  File "app.py", line 7, in <module>                                                                                                        
    from schema import schema                                                                                                               
  File "D:\Thomas\Dev\graphene-sqlalchemy\examples\flask_sqlalchemy\schema.py", line 60, in <module>                                        
    schema = graphene.Schema(query=Query, types=[Department, Employee, Role])         

....
                            
  File "D:\Programmes\Anaconda2\envs\py27\lib\site-packages\graphene\types\typemap.py", line 99, in graphene_reducer                        
    ).format(_type.graphene_type, type)                                                                                                     
AssertionError: Found different types with the same name in the schema: EmployeeConnection, EmployeeConnection.  

What am I doing wrong ?

Thank you

[ivanvorona]

@suxin1 thank you for your code but i was lazy reading it 😃 anyway, the fix is as simple as replacing “EmployeeConnection” with “EmployeeConnections”, following post helped me identify root cause: https://github.com/graphql-python/graphene-django/issues/185#issuecomment-388469296 hope will help someone else, all the best.

[RonaldZhao]

I solved this problem by changing a few names in schema.py, here is my code:

import graphene
from graphene import relay
from graphene_sqlalchemy import SQLAlchemyObjectType, SQLAlchemyConnectionField
from models import Department, Employee


class DepartmentNode(SQLAlchemyObjectType):
    class Meta:
        model = Department
        interfaces = (relay.Node,)


class DepartmentConnection(relay.Connection):
    class Meta:
        node = DepartmentNode


class EmployeeNode(SQLAlchemyObjectType):
    class Meta:
        model = Employee
        interfaces = (relay.Node,)


class EmployeeConnection(relay.Connection):
    class Meta:
        node = EmployeeNode


class Query(graphene.ObjectType):
    node = relay.Node.Field()
    all_employees = SQLAlchemyConnectionField(EmployeeConnection)
    all_departments = SQLAlchemyConnectionField(DepartmentConnection, sort=None)


schema = graphene.Schema(query=Query)

But why? I do not know, just lucky.