Create ActiveRecordModel and table for Merge Train feature

This database table and AR model is going to be used for
the merge train feature.

1 files changed, 18 insertions, 0 deletions

diff --git a/db/migrate/20190418182545_create_merge_request_trains_table.rb b/db/migrate/20190418182545_create_merge_request_trains_table.rb
new file mode 100644
index 00000000000..ac927c9c6b9
--- /dev/null
+++ b/db/migrate/20190418182545_create_merge_request_trains_table.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class CreateMergeRequestTrainsTable < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    create_table :merge_trains, id: :bigserial do |t|
+      t.references :merge_request, foreign_key: { on_delete: :cascade }, type: :integer, index: false, null: false
+      t.references :user, foreign_key: { on_delete: :cascade }, type: :integer, null: false
+      t.references :pipeline, foreign_key: { to_table: :ci_pipelines, on_delete: :nullify }, type: :integer
+      t.timestamps_with_timezone null: false
+
+      t.index [:merge_request_id], unique: true
+    end
+  end
+end