Added support for sqlalchemy choice

.travis.yml

@@ -23,7 +23,7 @@ before_install:
 install:
 - |
   if [ "$TEST_TYPE" = build ]; then
-    pip install --download-cache $HOME/.cache/pip/ pytest pytest-cov coveralls six pytest-django django-filter
+    pip install --download-cache $HOME/.cache/pip/ pytest pytest-cov coveralls six pytest-django django-filter sqlalchemy_utils
     pip install --download-cache $HOME/.cache/pip/ -e .[django]
     pip install --download-cache $HOME/.cache/pip/ -e .[sqlalchemy]
     pip install django==$DJANGO_VERSION

graphene/contrib/sqlalchemy/converter.py

@@ -2,7 +2,13 @@ from singledispatch import singledispatch
 
 from sqlalchemy import types
 from sqlalchemy.orm import interfaces
+try:
+    from sqlalchemy_utils.types.choice import ChoiceType
+except ImportError:
+    class ChoiceType(object):
+        pass
 
+from ...core.classtypes.enum import Enum
 from ...core.types.scalars import ID, Boolean, Float, Int, String
 from .fields import ConnectionOrListField, SQLAlchemyModelField
 
@@ -59,3 +65,9 @@ def convert_column_to_boolean(type, column):
 @convert_sqlalchemy_type.register(types.Numeric)
 def convert_column_to_float(type, column):
     return Float(description=column.doc)
+
+
+@convert_sqlalchemy_type.register(ChoiceType)
+def convert_column_to_enum(type, column):
+    name = '{}_{}'.format(column.table.name, column.name).upper()
+    return Enum(name, type.choices, description=column.doc)

graphene/contrib/sqlalchemy/tests/test_converter.py

@@ -5,7 +5,9 @@ from graphene.contrib.sqlalchemy.converter import (convert_sqlalchemy_column,
                                                    convert_sqlalchemy_relationship)
 from graphene.contrib.sqlalchemy.fields import (ConnectionOrListField,
                                                 SQLAlchemyModelField)
-from sqlalchemy import Column, types
+from sqlalchemy import Table, Column, types
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy_utils.types.choice import ChoiceType
 
 from .models import Article, Pet, Reporter
 
@@ -85,6 +87,23 @@ def test_should_numeric_convert_float():
     assert_column_conversion(types.Numeric(), graphene.Float)
 
 
+def test_should_choice_convert_enum():
+    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 graphene_type._meta.type_name == 'TRANSLATEDMODEL_LANGUAGE'
+    assert graphene_type._meta.description == 'Language'
+    assert graphene_type.__enum__.__members__['es'].value == 'Spanish'
+    assert graphene_type.__enum__.__members__['en'].value == 'English'
+
+
 def test_should_manytomany_convert_connectionorlist():
     graphene_type = convert_sqlalchemy_relationship(Reporter.pets.property)
     assert isinstance(graphene_type, ConnectionOrListField)

setup.py

@@ -63,6 +63,7 @@ setup(
         'pytest>=2.7.2',
         'pytest-django',
         'sqlalchemy',
+        'sqlalchemy_utils',
         'mock',
     ],
     extras_require={