Merge branch 'db/update-geo-nodes-primary' into 'master'

Disallow `NULL` values for `geo_nodes.primary` column

Closes gitlab-ee#12061

See merge request gitlab-org/gitlab-ce!29818

changelogs/unreleased/db-update-geo-nodes-primary.yml

+---
+title: Disallow `NULL` values for `geo_nodes.primary` column
+merge_request: 29818
+author: Arun Kumar Mohan
+type: other

db/post_migrate/20190618171120_update_geo_nodes_primary.rb

+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class UpdateGeoNodesPrimary < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    change_column_default(:geo_nodes, :primary, false)
+    change_column_null(:geo_nodes, :primary, false, false)
+  end
+
+  def down
+    change_column_default(:geo_nodes, :primary, nil)
+    change_column_null(:geo_nodes, :primary, true)
+  end
+end

db/schema.rb

@@ -1391,7 +1391,7 @@ ActiveRecord::Schema.define(version: 20190619175843) do
   end
 
   create_table "geo_nodes", id: :serial, force: :cascade do |t|
-    t.boolean "primary"
+    t.boolean "primary", default: false, null: false
     t.integer "oauth_application_id"
     t.boolean "enabled", default: true, null: false
     t.string "access_key"