Allow update dates at web controller

ee/app/controllers/groups/epics_controller.rb

@@ -66,8 +66,10 @@ class Groups::EpicsController < Groups::ApplicationController
     [
       :title,
       :description,
-      :start_date,
-      :end_date,
+      :start_date_fixed,
+      :start_date_is_fixed,
+      :due_date_fixed,
+      :due_date_is_fixed,
       label_ids: []
     ]
   end

ee/app/serializers/epic_entity.rb

@@ -6,8 +6,14 @@ class EpicEntity < IssuableEntity
   expose :group_full_name do |epic|
     epic.group.full_name
   end
+
   expose :start_date
-  expose :end_date
+  expose :start_date_is_fixed?, as: :start_date_is_fixed
+  expose :start_date_fixed, :start_date_from_milestones
+  expose :end_date, as: :due_date
+  expose :due_date_is_fixed?, as: :due_date_is_fixed
+  expose :due_date_fixed, :due_date_from_milestones
+
   expose :web_url do |epic|
     group_epic_path(epic.group, epic)
   end

ee/spec/controllers/groups/epics_controller_spec.rb

@@ -183,7 +183,7 @@ describe Groups::EpicsController do
     describe 'PUT #update' do
       before do
         group.add_developer(user)
-        put :update, group_id: group, id: epic.to_param, epic: { title: 'New title', label_ids: [label.id] }, format: :json
+        put :update, group_id: group, id: epic.to_param, epic: { title: 'New title', label_ids: [label.id], start_date_fixed: '2002-01-01', start_date_is_fixed: true }, format: :json
       end
 
       it 'returns status 200' do
@@ -195,6 +195,8 @@ describe Groups::EpicsController do
 
         expect(epic.title).to eq('New title')
         expect(epic.labels).to eq([label])
+        expect(epic.start_date_fixed).to eq(Date.new(2002, 1, 1))
+        expect(epic.start_date_is_fixed).to eq(true)
       end
     end