Make ActiveRecord::PendingMigrationError actionable

activerecord/lib/active_record/migration.rb

@@ -129,6 +129,12 @@ def initialize(name = nil)
   end
 
   class PendingMigrationError < MigrationError #:nodoc:
+    include ActiveSupport::ActionableError
+
+    action "Run pending migrations" do
+      ActiveRecord::Tasks::DatabaseTasks.migrate
+    end
+
     def initialize(message = nil)
       if !message && defined?(Rails.env)
         super("Migrations are pending. To resolve this issue, run:\n\n        rails db:migrate RAILS_ENV=#{::Rails.env}")

activerecord/test/cases/tasks/database_tasks_test.rb

@@ -760,7 +760,7 @@ class DatabaseTasksMigrationTestCase < ActiveRecord::TestCase
     end
 
     class DatabaseTasksMigrateTest < DatabaseTasksMigrationTestCase
-      def test_migrate_set_and_unset_verbose_and_version_env_vars
+      def test_can_migrate_from_pending_migration_error_action_dispatch
         verbose, version = ENV["VERBOSE"], ENV["VERSION"]
         ENV["VERSION"] = "2"
         ENV["VERBOSE"] = "false"
@@ -772,7 +772,9 @@ def test_migrate_set_and_unset_verbose_and_version_env_vars
         ENV.delete("VERBOSE")
 
         # re-run up migration
-        assert_includes capture_migration_output, "migrating"
+        assert_includes(capture(:stdout) do
+          ActiveSupport::ActionableError.dispatch ActiveRecord::PendingMigrationError, "Run pending migrations"
+        end, "migrating")
       ensure
         ENV["VERBOSE"], ENV["VERSION"] = verbose, version
       end