Set Web hook schema defaults to intended default values

changelogs/unreleased/sh-fix-webhook-defaults.yml

+---
+title: Set Web hook defaults to intended default values
+merge_request: 59814
+author:
+type: fixed

db/migrate/20210420012444_change_web_hook_events_default.rb

+# frozen_string_literal: true
+
+class ChangeWebHookEventsDefault < ActiveRecord::Migration[6.0]
+  def up
+    change_column_default :web_hooks, :push_events, true
+    change_column_default :web_hooks, :issues_events, false
+    change_column_default :web_hooks, :merge_requests_events, false
+    change_column_default :web_hooks, :tag_push_events, false
+  end
+
+  # This is a NOP because this migration is supposed to restore the
+  # intended schema, not revert it.
+  def down
+  end
+end

db/schema_migrations/20210420012444

+f0bf8c79c1981ecd95c933f37ec5b0187ee6321792d96db26d863b192843c5ab
\ No newline at end of file

spec/migrations/change_web_hook_events_default_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+require Rails.root.join('db', 'migrate', '20210420012444_change_web_hook_events_default.rb')
+
+RSpec.describe ChangeWebHookEventsDefault do
+  let(:web_hooks) { table(:web_hooks) }
+  let(:projects) { table(:projects) }
+  let(:groups) { table(:namespaces) }
+
+  let(:group) { groups.create!(name: 'gitlab', path: 'gitlab-org') }
+  let(:project) { projects.create!(name: 'gitlab', path: 'gitlab', namespace_id: group.id) }
+  let(:hook) { web_hooks.create!(project_id: project.id, type: 'ProjectHook') }
+  let(:group_hook) { web_hooks.create!(group_id: group.id, type: 'GroupHook') }
+
+  before do
+    # Simulate the wrong schema
+    %w(push_events issues_events merge_requests_events tag_push_events).each do |column|
+      ActiveRecord::Base.connection.execute "ALTER TABLE web_hooks ALTER COLUMN #{column} DROP DEFAULT"
+    end
+  end
+
+  it 'sets default values' do
+    migrate!
+
+    expect(hook.push_events).to be true
+    expect(hook.issues_events).to be false
+    expect(hook.merge_requests_events).to be false
+    expect(hook.tag_push_events).to be false
+
+    expect(group_hook.push_events).to be true
+    expect(group_hook.issues_events).to be false
+    expect(group_hook.merge_requests_events).to be false
+    expect(group_hook.tag_push_events).to be false
+  end
+end