If a custom action is being returned for a sub collection, the collec…

…tion href should be returned because custom actions are not supported on sub resources.

app/controllers/api/base_controller/renderer.rb

@@ -352,7 +352,7 @@ def add_actions(json, aspecs, type)
       def expand_resource_custom_actions(resource, json, type, physical_attrs)
         return unless render_actions(physical_attrs) && collection_config.custom_actions?(type)
 
-        href = json.attributes!["href"]
+        href = @req.subcollection.present? ? collection_href(@req.subcollection, resource.id) : json.attributes!["href"]
         json.actions do |js|
           resource_custom_action_names(resource).each do |action|
             add_child js, "name" => action, "method" => :post, "href" => href

spec/requests/generic_object_definitions_spec.rb

@@ -145,7 +145,7 @@
         'id'                  => object.id.to_s,
         'name'                => 'bar',
         'property_attributes' => { 'is_something' => true },
-        'actions'             => [{'name' => 'foo', 'method' => 'post', 'href' => api_generic_object_definition_generic_object_url(nil, object_def.id, object.id)}]
+        'actions'             => [{'name' => 'foo', 'method' => 'post', 'href' => api_generic_object_url(nil, object.id)}]
       }
       expect(response.parsed_body).to include(expected)
       expect(response).to have_http_status(:ok)