Fix enum column conversion by "instantiating" Enum

Author: Joshua Cannon

graphene_sqlalchemy/converter.py

@@ -152,17 +152,24 @@ def convert_enum_to_enum(type, column, registry=None):
     else:  # Nope, just a list of string options
         items = zip(type.enums, type.enums)
         graphene_type = Enum(type.name, items)
-    return Field(
-        graphene_type,
+    return graphene_type(
         description=get_column_doc(column),
         required=not (is_column_nullable(column)),
     )
 
 
 @convert_sqlalchemy_type.register(ChoiceType)
-def convert_column_to_enum(type, column, registry=None):
-    name = "{}_{}".format(column.table.name, column.name).upper()
-    return Enum(name, type.choices, description=get_column_doc(column))
+def convert_column_to_enum(type_, column, registry=None):
+    is_enum = isinstance(type_.choices, type)
+    if is_enum:
+        graphene_type = Enum.from_enum(type_.choices)
+    else:
+        name = "{}_{}".format(column.table.name, column.name).upper()
+        graphene_type = Enum(name, type_.choices)
+    return graphene_type(
+        description=get_column_doc(column),
+        required=not (is_column_nullable(column)),
+    )
 
 
 @convert_sqlalchemy_type.register(ScalarListType)

graphene_sqlalchemy/tests/test_converter.py

@@ -87,19 +87,11 @@ def test_should_unicodetext_convert_string():
 
 
 def test_should_enum_convert_enum():
-    field = assert_column_conversion(
-        types.Enum(enum.Enum("one", "two")), graphene.Field
+    graphene_field = assert_column_conversion(
+        types.Enum("one", "two", name="two_numbers"), graphene.Enum
     )
-    field_type = field.type()
-    assert isinstance(field_type, graphene.Enum)
-    assert hasattr(field_type, "two")
-    field = assert_column_conversion(
-        types.Enum("one", "two", name="two_numbers"), graphene.Field
-    )
-    field_type = field.type()
-    assert field_type.__class__.__name__ == "two_numbers"
-    assert isinstance(field_type, graphene.Enum)
-    assert hasattr(field_type, "two")
+    assert graphene_field.type.__name__ == "two_numbers"
+    assert hasattr(graphene_field.type, 'two')
 
 
 def test_should_small_integer_convert_int():
@@ -142,18 +134,26 @@ def test_should_label_convert_int():
     assert isinstance(graphene_type, graphene.Int)
 
 
-def test_should_choice_convert_enum():
+def test_should_choice_convert_list():
     TYPES = [(u"es", u"Spanish"), (u"en", u"English")]
     column = Column(ChoiceType(TYPES), doc="Language", name="language")
     Base = declarative_base()
-
     Table("translatedmodel", Base.metadata, column)
     graphene_type = convert_sqlalchemy_column(column)
-    assert issubclass(graphene_type, graphene.Enum)
+
+    assert isinstance(graphene_type, graphene.Enum)
     assert graphene_type._meta.name == "TRANSLATEDMODEL_LANGUAGE"
-    assert graphene_type._meta.description == "Language"
-    assert graphene_type._meta.enum.__members__["es"].value == "Spanish"
-    assert graphene_type._meta.enum.__members__["en"].value == "English"
+    assert graphene_type.Field().description == "Language"
+    assert graphene_type.es.value == "Spanish"
+    assert graphene_type.en.value == "English"
+
+
+def test_should_choice_convert_enum():
+    TYPES = enum.Enum("TYPES", [(u"es", u"Spanish"), (u"en", u"English")])
+    graphene_field = assert_column_conversion(ChoiceType(TYPES), graphene.Enum)
+    assert graphene_field.type._meta.name == "TYPES"
+    assert graphene_field.type.es.value == "Spanish"
+    assert graphene_field.type.en.value == "English"
 
 
 def test_should_columproperty_convert():
@@ -270,23 +270,19 @@ def test_should_postgresql_uuid_convert():
 
 
 def test_should_postgresql_enum_convert():
-    field = assert_column_conversion(
-        postgresql.ENUM("one", "two", name="two_numbers"), graphene.Field
+    graphene_field = assert_column_conversion(
+        postgresql.ENUM("one", "two", name="two_numbers"), graphene.Enum
     )
-    field_type = field.type()
-    assert field_type.__class__.__name__ == "two_numbers"
-    assert isinstance(field_type, graphene.Enum)
-    assert hasattr(field_type, "two")
+    assert graphene_field.type.__name__ == "two_numbers"
+    assert hasattr(graphene_field.type, "two")
 
 
 def test_should_postgresql_py_enum_convert():
-    field = assert_column_conversion(
-        postgresql.ENUM(enum.Enum("TwoNumbers", "one two"), name="two_numbers"), graphene.Field
+    graphene_field = assert_column_conversion(
+        postgresql.ENUM(enum.Enum("TwoNumbers", "one two"), name="two_numbers"), graphene.Enum
     )
-    field_type = field.type()
-    assert field_type.__class__.__name__ == "TwoNumbers"
-    assert isinstance(field_type, graphene.Enum)
-    assert hasattr(field_type, "two")
+    assert graphene_field.type.__name__ == "TwoNumbers"
+    assert hasattr(graphene_field.type, "two")
 
 
 def test_should_postgresql_array_convert():