Backport of initial merge request blocks support

1 files changed, 25 insertions, 0 deletions

diff --git a/db/migrate/20190412155659_add_merge_request_blocks.rb b/db/migrate/20190412155659_add_merge_request_blocks.rb
new file mode 100644
index 00000000000..9e7f370d1cf
--- /dev/null
+++ b/db/migrate/20190412155659_add_merge_request_blocks.rb
@@ -0,0 +1,25 @@
+# frozen_string_literal: true
+
+class AddMergeRequestBlocks < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def change
+    create_table :merge_request_blocks, id: :bigserial do |t|
+      t.references :blocking_merge_request,
+                   index: false, null: false,
+                   foreign_key: { to_table: :merge_requests, on_delete: :cascade }
+
+      t.references :blocked_merge_request,
+                   index: true, null: false,
+                   foreign_key: { to_table: :merge_requests, on_delete: :cascade }
+
+      t.index [:blocking_merge_request_id, :blocked_merge_request_id],
+              unique: true,
+              name: 'index_mr_blocks_on_blocking_and_blocked_mr_ids'
+
+      t.timestamps_with_timezone
+    end
+  end
+end