[Sqlalchemy-tickets] Issue #4326: Inherited declared_attr hybrid_property looses extension_type (zzzeek/sqlalchemy)

[Dmytro S. <iss...@bi...>]

New issue 4326: Inherited declared_attr hybrid_property looses extension_type
https://bitbucket.org/zzzeek/sqlalchemy/issues/4326/inherited-declared_attr-hybrid_property

Dmytro Starosud:

This is using sqlalchemy 1.2.11.

Please consider following code snippet.


```
#!python
from sqlalchemy import inspect, Column, String
from sqlalchemy.ext.declarative import declarative_base, declared_attr
from sqlalchemy.ext.hybrid import hybrid_property

class Mixin:
    @hybrid_property
    def hp1(cls):
        return 42

    @declared_attr
    def hp2(cls):
        @hybrid_property
        def hp2(self):
            return 42
        return hp2

class Base(declarative_base(), Mixin):
    __tablename__ = 'test'
    id = Column(String, primary_key=True)

class Derived(Base):
    pass

print(inspect(Base).mapper.all_orm_descriptors['hp1'].extension_type)
print(inspect(Base).mapper.all_orm_descriptors['hp2'].extension_type)
print(inspect(Derived).mapper.all_orm_descriptors['hp1'].extension_type)
print(inspect(Derived).mapper.all_orm_descriptors['hp2'].extension_type)
# prints
# symbol('HYBRID_PROPERTY')
# symbol('HYBRID_PROPERTY')
# symbol('HYBRID_PROPERTY')
# symbol('NOT_EXTENSION')
```

Should I use another way to determine type of orm descriptor?

Thanks a lot in advance!