attribute access and setting for pydantic_model uned the hood

tests/test_columns.py

@@ -0,0 +1,52 @@
+import pytest
+import sqlalchemy
+
+import orm.fields as fields
+from orm.exceptions import ModelDefinitionError
+from orm.models import Model
+
+metadata = sqlalchemy.MetaData()
+
+
+class ExampleModel(Model):
+    __tablename__ = "example"
+    __metadata__ = metadata
+    test = fields.Integer(primary_key=True)
+    test2 = fields.String(length=250)
+
+
+class ExampleModel2(Model):
+    __tablename__ = "example2"
+    __metadata__ = metadata
+    test = fields.Integer(name='test12', primary_key=True)
+    test2 = fields.String('test22', length=250)
+
+
+def test_model_attribute_access():
+    example = ExampleModel(test=1, test2='test')
+    assert example.test == 1
+    assert example.test2 == 'test'
+
+    example.test = 12
+    assert example.test == 12
+
+    example.new_attr = 12
+    assert 'new_attr' in example.__dict__
+
+
+def test_primary_key_access_and_setting():
+    example = ExampleModel(pk=1, test2='test')
+    assert example.pk == 1
+    example.pk = 2
+
+    assert example.pk == 2
+    assert example.test == 2
+
+
+def test_wrong_model_definition():
+    with pytest.raises(ModelDefinitionError):
+        class ExampleModel2(Model):
+            __tablename__ = "example3"
+            __metadata__ = metadata
+            test = fields.Integer(name='test12', primary_key=True)
+            test2 = fields.String('test22', name='test22', length=250)