Add index_merge_request_diffs_on_merge_request_id

db/migrate/20140304005354_add_index_merge_request_diffs_on_merge_request_id.rb

+class AddIndexMergeRequestDiffsOnMergeRequestId < ActiveRecord::Migration
+  def change
+    add_index :merge_request_diffs, :merge_request_id, unique: true
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20140214102325) do
+ActiveRecord::Schema.define(version: 20140304005354) do
 
   create_table "broadcast_messages", force: true do |t|
     t.text     "message",    null: false
@@ -114,6 +114,8 @@ ActiveRecord::Schema.define(version: 20140214102325) do
     t.datetime "updated_at"
   end
 
+  add_index "merge_request_diffs", ["merge_request_id"], name: "index_merge_request_diffs_on_merge_request_id", unique: true, using: :btree
+
   create_table "merge_requests", force: true do |t|
     t.string   "target_branch",     null: false
     t.string   "source_branch",     null: false