refactor: Update inspection mixin

sqlalchemy_mixins/inspection.py

@@ -35,7 +35,7 @@ def primary_keys(cls):
     def relations(cls):
         """Return a `list` of relationship names or the given model
         """
-        return [c.key for c in cls.__mapper__.iterate_properties
+        return [c.key for c in cls.__mapper__.attrs
                 if isinstance(c, RelationshipProperty)]
 
     @classproperty

sqlalchemy_mixins/tests/test_inspection.py

@@ -3,7 +3,7 @@
 import sqlalchemy as sa
 from sqlalchemy import create_engine
 from sqlalchemy.ext.hybrid import hybrid_property, hybrid_method
-from sqlalchemy.orm import sessionmaker, configure_mappers, DeclarativeBase
+from sqlalchemy.orm import sessionmaker, DeclarativeBase
 
 from sqlalchemy_mixins import InspectionMixin
 
@@ -61,11 +61,6 @@ class ModelWithTwoPks(BaseModel):
     pk2 = sa.Column(sa.Integer, primary_key=True)
 
 
-# For sqlalchemy >= 2.0. This call is required in order to configure
-# relationships created from backrefs
-configure_mappers()
-
-
 class TestSessionMixin(unittest.TestCase):
     def setUp(self):
         Base.metadata.create_all(engine)

sqlalchemy_mixins/utils.py

@@ -20,7 +20,7 @@ def get_relations(cls):
         mapper = cls
     else:
         mapper = cls.__mapper__
-    return [c for c in mapper.iterate_properties
+    return [c for c in mapper.attrs
             if isinstance(c, RelationshipProperty)]