Builder options

Advanced options applied when writing the generated code

The moor_generator package has some options that control how the code is generated. Note that, in most cases, the default settings should be sufficient. See the section on recommended settings below.

To use the options, create a build.yaml file in the root of your project (e.g. next to your pubspec.yaml):

# build.yaml. This file is quite powerful, see

          compact_query_methods: true

Available options

At the moment, moor supports these options:

  • write_from_json_string_constructor: boolean. Adds a .fromJsonString factory constructor to generated data classes. By default, we only write a .fromJson constructor that takes a Map<String, dynamic>.
  • override_hash_and_equals_in_result_sets: boolean. When moor generates another class to hold the result of generated select queries, this flag controls whether moor should override operator == and hashCode in those classes.
  • compact_query_methods: For queries declared on a @UseMoor or @UseDao annotation, moor will generate three methods: A base method returning a Selectable and then two helper methods returning a Stream or a Future. As the Selectable class contains its own methods to convert it to a Stream and Future, the two later methods only exist for backwards compatibility. When this flag is enabled, moor won’t write them at all. This will be the only option in moor 3.0
  • skip_verification_code: Generated tables contain a significant chunk of code to verify integrity of inserted data and report detailed errors when the integrity is violated. If you’re only using inserts with SQL, or don’t need this functionality, enabling this flag can help to reduce the amount generated code.
  • use_data_class_name_for_companions: By default, the name for companion classes is based on the table name (e.g. a @DataClassName('Users') class UsersTable extends Table would generate a UsersTableCompanion). With this option, the name is based on the data class (so UsersCompanion in this case).
  • use_column_name_as_json_key_when_defined_in_moor_file: When serializing columns declared inside a .moor file from and to json, use their sql name instead of the generated Dart getter name (so a column named user_name would also use user_name as a json key instead of userName). This will be the only option in moor 3.0. You can always override the json key by using a JSON KEY column constraint (e.g. user_name VARCHAR NOT NULL JSON KEY userName)
  • generate_connect_constructor: Generate necessary code to support the isolate runtime. This is a build option because isolates are still experimental. This will be the default option eventually.
  • use_experimental_inference: Use a new, experimental type inference algorithm when analyzing sql statements. The algorithm is designed to yield more accurate results on nullability and complex constructs. Note that it’s in a preview state at the moment, which means that generated code might change after a minor update.
  • sqlite_modules: This list can be used to enable sqlite extensions, like those for json or full-text search. Modules have to be enabled explicitly because they’re not supported on all platforms. See the following section for details.
  • use_experimental_inference: Enables a new type inference algorithm for sql statements. The new algorithm is much better at handling complex statements and nullability. However, it’s still in development and may not work in all cases yet. Please report any issues you can find. Warning: The new type inference algorithm is in development and does not obey to semantic versioning. Results and generated code might change in moor versions not declared as breaking.

Available extensions

Note: This enables extensions in the analyzer for custom queries only. For instance, when the json1 extension is enabled, the json functions can be used in moor files. This doesn’t necessarily mean that those functions are supported at runtime! Both extensions are available on iOS 11 or later. On Android, they’re only available when using moor_ffi. See our docs for more details on them.

            - json1
            - fts5

We currently support the json1 and fts5 extensions for static analysis. Feel free to create an issue if you need support for different extensions.

In general, we recommend not enabling these options unless you need to. There are some exceptions though:

  • compact_query_methods and use_column_name_as_json_key_when_defined_in_moor_file: We recommend enabling both flags for new projects because they’ll be the only option in the next breaking release.
  • skip_verification_code: You can remove a significant portion of generated code with this option. The downside is that error messages when inserting invalid data will be less specific.
Last modified January 13, 2020: types: Analyze functions (ddda6797)