Add is_deprecated computed property

Author: jkimbo

graphql/type/definition.py

@@ -261,6 +261,10 @@ def __eq__(self, other):
     def __hash__(self):
         return id(self)
 
+    @property
+    def is_deprecated(self):
+        return bool(self.deprecation_reason)
+
 
 class GraphQLArgument(object):
     __slots__ = 'type', 'default_value', 'description', 'out_name'

graphql/type/tests/test_definition.py

@@ -118,6 +118,23 @@ def test_defines_a_subscription_schema():
     # assert subscription.name == 'articleSubscribe'
 
 
+def test_defines_an_object_type_with_deprecated_field():
+    TypeWithDeprecatedField = GraphQLObjectType('foo', fields={
+        'bar': GraphQLField(
+            type=GraphQLString,
+            deprecation_reason='A terrible reason'
+        ),
+    })
+
+    field = TypeWithDeprecatedField.fields['bar']
+    assert field.type == GraphQLString
+    assert field.description is None
+    assert field.deprecation_reason == 'A terrible reason'
+    assert field.is_deprecated is True
+    # assert field.name == 'bar'
+    assert field.args == OrderedDict()
+
+
 def test_includes_nested_input_objects_in_the_map():
     NestedInputObject = GraphQLInputObjectType(
         name='NestedInputObject',