Adding NOT NULL constraint to private_profile

This change sets NOT NULL constraint to users.private profile.

changelogs/unreleased/57538-not-null-constraint-on-users-private-profile.yml

+---
+title: Setting NOT NULL constraint to users.private_profile column
+merge_request: 14838
+author:
+type: other

db/post_migrate/20190725080128_set_not_null_on_users_private_profile.rb

+# frozen_string_literal: true
+
+class SetNotNullOnUsersPrivateProfile < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    Gitlab::BackgroundMigration.steal('MigrateNullPrivateProfileToFalse')
+
+    # rubocop:disable Migration/UpdateLargeTable
+    # rubocop:disable Migration/UpdateColumnInBatches
+    # Data has been migrated previously, count should be close to 0
+    update_column_in_batches(:users, :private_profile, false) do |table, query|
+      query.where(table[:private_profile].eq(nil))
+    end
+
+    change_column_null :users, :private_profile, false
+  end
+
+  def down
+    change_column_null :users, :private_profile, true
+  end
+end

db/schema.rb

@@ -3517,7 +3517,7 @@ ActiveRecord::Schema.define(version: 2019_08_22_181528) do
     t.integer "theme_id", limit: 2
     t.integer "accepted_term_id"
     t.string "feed_token"
-    t.boolean "private_profile", default: false
+    t.boolean "private_profile", default: false, null: false
     t.integer "roadmap_layout", limit: 2
     t.boolean "include_private_contributions"
     t.string "commit_email"

spec/models/user_spec.rb

@@ -1176,7 +1176,7 @@ describe User do
         expect(user.can_create_group).to eq(Gitlab.config.gitlab.default_can_create_group)
         expect(user.theme_id).to eq(Gitlab.config.gitlab.default_theme)
         expect(user.external).to be_falsey
-        expect(user.private_profile).to eq false
+        expect(user.private_profile).to eq(false)
       end
     end