Fix rubocop issues. Use add_concurrent_foreign_key.

app/validators/cron_validator.rb

@@ -5,7 +5,6 @@ class CronValidator < ActiveModel::EachValidator
   def validate_each(record, attribute, value)
     cron_parser = Ci::CronParser.new(record.cron, record.cron_time_zone)
     is_valid_cron, is_valid_cron_time_zone = cron_parser.validation
-    next_time = cron_parser.next_time_from(Time.now)
 
     if !is_valid_cron
       record.errors.add(:cron, " is invalid syntax")

db/migrate/20170329095325_add_ref_to_triggers.rb

-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
 class AddRefToTriggers < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 
-  # Set this constant to true if this migration requires downtime.
   DOWNTIME = false
 
   def change

db/migrate/20170329095907_create_ci_trigger_schedules.rb

-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
 class CreateCiTriggerSchedules < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 
-  # Set this constant to true if this migration requires downtime.
   DOWNTIME = false
 
-  def change
+  disable_ddl_transaction!
+
+  def up
     create_table :ci_trigger_schedules do |t|
       t.integer "project_id"
       t.integer "trigger_id", null: false
@@ -21,6 +19,11 @@ class CreateCiTriggerSchedules < ActiveRecord::Migration
 
     add_index :ci_trigger_schedules, ["next_run_at"], name: "index_ci_trigger_schedules_on_next_run_at", using: :btree
     add_index :ci_trigger_schedules, ["project_id"], name: "index_ci_trigger_schedules_on_project_id", using: :btree
-    add_foreign_key :ci_trigger_schedules, :ci_triggers, column: :trigger_id, on_delete: :cascade
+    add_concurrent_foreign_key :ci_trigger_schedules, :ci_triggers, column: :trigger_id, on_delete: :cascade
+  end
+
+  def down
+    remove_foreign_key :ci_trigger_schedules, column: :trigger_id
+    drop_table :ci_trigger_schedules
   end
 end

db/schema.rb

@@ -1313,7 +1313,7 @@ ActiveRecord::Schema.define(version: 20170405080720) do
 
   add_foreign_key "boards", "projects"
   add_foreign_key "chat_teams", "namespaces", on_delete: :cascade
-  add_foreign_key "ci_trigger_schedules", "ci_triggers", column: "trigger_id", on_delete: :cascade
+  add_foreign_key "ci_trigger_schedules", "ci_triggers", column: "trigger_id", name: "fk_90a406cc94", on_delete: :cascade
   add_foreign_key "ci_triggers", "users", column: "owner_id", name: "fk_e8e10d1964", on_delete: :cascade
   add_foreign_key "issue_metrics", "issues", on_delete: :cascade
   add_foreign_key "label_priorities", "labels", on_delete: :cascade

lib/ci/cron_parser.rb

 module Ci
   class CronParser
-    VALID_SYNTAX_SAMPLE_TIME_ZONE = 'UTC'
-    VALID_SYNTAX_SAMPLE_CRON = '* * * * *'
+    VALID_SYNTAX_SAMPLE_TIME_ZONE = 'UTC'.freeze
+    VALID_SYNTAX_SAMPLE_CRON = '* * * * *'.freeze
 
     def initialize(cron, cron_time_zone = 'UTC')
       @cron = cron
@@ -9,9 +9,9 @@ module Ci
     end
 
     def next_time_from(time)
-      cronLine = try_parse_cron(@cron, @cron_time_zone)
-      if cronLine.present?
-        cronLine.next_time(time).in_time_zone(Time.zone)
+      cron_line = try_parse_cron(@cron, @cron_time_zone)
+      if cron_line.present?
+        cron_line.next_time(time).in_time_zone(Time.zone)
       else
         nil
       end

spec/models/ci/trigger_schedule_spec.rb

 require 'spec_helper'
 
 describe Ci::TriggerSchedule, models: true do
-
   it { is_expected.to belong_to(:project) }
   it { is_expected.to belong_to(:trigger) }
   it { is_expected.to respond_to :ref }