data_fixture_dart

Create data models easily, with no headache.

Usage

Basic

1. Create a new file to define the fixture factory for a model.

   
   import 'package:data_fixture_dart/data_fixture_dart.dart';

class Company { final String name; final List employees;

Company({this.name, this.employees}); }

extension CompanyFixture on Company { static _CompanyFixtureFactory factory() => _CompanyFixtureFactory(); }

class _CompanyFixtureFactory extends FixtureFactory { @override FixtureDefinition definition() => define( (faker) => Company( name: faker.company.name(), employees: PersonFixture.factory().makeMany(5), ), );

// If you need to override a model field, simply define a function that returns a FixtureDefinition. // To redefine the default definition, you must use the redefine function. FixtureDefinition empty(String name) => redefine( (company) => Company( name: name, employees: [], ), ); }

2. Then you can build the model by using its factory.
```dart
// Create a single object of type Company.
CompanyFixture.factory().makeSingle();
// Create a single object of type Company with no employees.
CompanyFixture.factory().empty("EmptyCompany").make();

// Create 10 objects of type Company.
CompanyFixture.factory().makeMany(10);
// Create 10 objects of type Company with no employees.
CompanyFixture.factory().empty("EmptyCompany").makeMany(10);

JSON Fixtures

A factory can create a JSON Object from a generated model.

1. First, you have to extend JSONFixtureFactory protocol to the model factory.

   
   import 'package:data_fixture_dart/data_fixture_dart.dart';

extension CompanyFixture on Company { static _CompanyFixtureFactory factory() => _CompanyFixtureFactory(); }

class _CompanyFixtureFactory extends JsonFixtureFactory { @override FixtureDefinition definition() => define( (faker) => Company( name: faker.company.name(), employees: PersonFixture.factory().makeMany(5), ), );

// This function define the json definition, using the default definition (function definition()). @override JsonFixtureDefinition jsonDefinition() => defineJson( (company) => { "name": company.name, "employees": PersonFixture.factory().makeJsonArrayFromMany(company.employees), }, );

// If you need to generate the JSON Object of an empty company, change the return type to JSONFixtureDefinition // Previously the return was FixtureDefinition. JsonFixtureDefinition empty(String name) => redefineJson( (company) => Company( name: name, employees: [], ), ); }

2. Now you can generate the JSON Object of the model.
```dart
// Create a single JSON object of type Company.
CompanyFixture.factory().makeJsonObject();
// Create a single JSON object of type Company with no employees.
CompanyFixture.factory().empty("EmptyCompany").makeJsonObject();

// Create a JSON Array of 10 objects of type Company.
CompanyFixture.factory().makeJsonArray(10)
// Create a JSON Array of 10 objects of type Company with no employees.
CompanyFixture.factory().empty("EmptyCompany").makeJsonArray(10);

// Create a Company object with its relative JSON object.
CompanyFixture.factory().makeSingleWithJsonObject();
// Create 10 Company object with its relative JSON objects.
CompanyFixture.factory().makeManyWithJsonArray(10);

3. With JsonFixtureFactory you can create a JSON from an external model object.

   
   final company = CompanyFixture.factory.makeSingle();
   final JSONObject = CompanyFixture.factory.makeJsonObjectFromSingle(from: company);

final companies = CompanyFixture.factory.makeMany(3); final JSONArray = CompanyFixture.factory.makeJsonArrayFromMany(from: companies);

### Using a custom Faker instance

Sometimes you want your `Faker` to have maybe a custom `seed` or custom `provider`.
In that case you can simply pass a custom `Faker` instance to either `define` or `redefine`
```dart
import 'package:data_fixture_dart/data_fixture_dart.dart';

extension NewsArticleFixture on NewsArticle {
  static _NewsArticleFactory factory() => _NewsArticleFactory();
}

class _NewsArticleFixtureFactory extends FixtureFactory<NewsArticle> {
  @override
  FixtureDefinition<NewsArticle> definition() => define(
    (Faker faker) => NewsArticle(
      title: faker.lorem.sentence(),
      content: faker.lorem.sentences(3).join(' '),
    ),
    faker: Faker(
      seed: Random().nextInt(1234567890),
      provider: FakerDataProvider(
        loremDataProvider: MyCustomLoremDataProvider(),
      ),
    ),
  );

  FixtureDefinition<Company> noContent() => redefine(
    (newsArticle) => NewsArticle(
      title: faker.lorem.sentence(),
      content: null,
    ),
    faker: Faker(
      seed: Random().nextInt(9876543210),
      provider: FakerDataProvider(
        loremDataProvider: MyOtherCustomLoremDataProvider(),
      ),
    ),
  );
}

Contributing

data_fixture_dart is an open source project, so feel free to contribute. You can open an issue for problems or suggestions, and you can propose your own fixes by opening a pull request with the changes.

Testing

In order to test the package run this command

dart test