module MigrationsHelpers def table(name) Class.new(ActiveRecord::Base) { self.table_name = name } end def migrations_paths ActiveRecord::Migrator.migrations_paths end def table_exists?(name) ActiveRecord::Base.connection.table_exists?(name) end def migrations ActiveRecord::Migrator.migrations(migrations_paths) end def clear_schema_cache! ActiveRecord::Base.connection_pool.connections.each do |conn| conn.schema_cache.clear! end end def reset_column_in_all_models clear_schema_cache! # Reset column information for the most offending classes **after** we # migrated the schema up, otherwise, column information could be outdated ActiveRecord::Base.descendants.each { |klass| klass.reset_column_information } # Without that, we get errors because of missing attributes, e.g. # super: no superclass method `elasticsearch_indexing' for # ApplicationSetting.define_attribute_methods end def previous_migration migrations.each_cons(2) do |previous, migration| break previous if migration.name == described_class.name end end def migration_schema_version self.class.metadata[:schema] || previous_migration.version end def schema_migrate_down! disable_migrations_output do ActiveRecord::Migrator.migrate(migrations_paths, migration_schema_version) end reset_column_in_all_models end def schema_migrate_up! disable_migrations_output do ActiveRecord::Migrator.migrate(migrations_paths) end reset_column_in_all_models end def disable_migrations_output ActiveRecord::Migration.verbose = false yield ensure ActiveRecord::Migration.verbose = true end def migrate! ActiveRecord::Migrator.up(migrations_paths) do |migration| migration.name == described_class.name end end end