Fix property_fields not being inherited. Fix for #774. (#891)

* Fix property_fields not being inherited. Fix for #774.

* Fix coverage

* Fix coverage by removing set attribute update - during inheriting the current property fields are not set yet.

tests/test_inheritance_and_pydantic_generation/test_inheritance_of_property_fields.py

@@ -0,0 +1,69 @@
+import databases
+import pytest
+import sqlalchemy
+import sqlalchemy as sa
+
+import ormar
+from tests.settings import DATABASE_URL
+
+metadata = sa.MetaData()
+database = databases.Database(DATABASE_URL)
+
+
+class BaseFoo(ormar.Model):
+    class Meta:
+        abstract = True
+
+    name: str = ormar.String(max_length=100)
+
+    @ormar.property_field
+    def prefixed_name(self) -> str:
+        return "prefix_" + self.name
+
+
+class Foo(BaseFoo):
+    class Meta:
+        metadata = metadata
+        database = database
+
+    @ormar.property_field
+    def double_prefixed_name(self) -> str:
+        return "prefix2_" + self.name
+
+    id: int = ormar.Integer(primary_key=True)
+
+
+class Bar(BaseFoo):
+    class Meta:
+        metadata = metadata
+        database = database
+
+    @ormar.property_field
+    def prefixed_name(self) -> str:
+        return "baz_" + self.name
+
+    id: int = ormar.Integer(primary_key=True)
+
+
+@pytest.fixture(autouse=True, scope="module")
+def create_test_database():
+    engine = sqlalchemy.create_engine(DATABASE_URL)
+    metadata.drop_all(engine)
+    metadata.create_all(engine)
+    yield
+    metadata.drop_all(engine)
+
+
+def test_property_fields_are_inherited():
+    foo = Foo(name="foo")
+    assert foo.prefixed_name == "prefix_foo"
+    assert foo.dict() == {
+        "name": "foo",
+        "id": None,
+        "double_prefixed_name": "prefix2_foo",
+        "prefixed_name": "prefix_foo",
+    }
+
+    bar = Bar(name="bar")
+    assert bar.prefixed_name == "baz_bar"
+    assert bar.dict() == {"name": "bar", "id": None, "prefixed_name": "baz_bar"}