Flutter

This SDK can be used for Flutter applications. The source code for the client is available on Github.

Getting Started

The client library is available from the https://pub.dev:

dependencies:
  bullet_train:

Usage

Retrieving feature flags for your project

For full documentation visit https://docs.flagsmith.com

Sign Up and create an account at https://flagsmith.com/

In your application, initialise the BulletTrain client with your API key:

var bulletClient = BulletTrainClient(apiKey: 'YOUR_ENV_API_KEY')

To check if a feature flag exists and is enabled:

bool featureEnabled = await bulletClient.hasFeatureFlag("my_test_feature");
if (featureEnabled) {
    // run the code to execute enabled feature
} else {
    // run the code if feature switched off
}

To get the configuration value for a feature flag:

var myRemoteConfig = await bulletClient.getFeatureFlagValue("my_test_feature");
if (myRemoteConfig != null) {
    // run the code to use remote config value
} else {
    // run the code without remote config
}

Identifying users

Identifying users allows you to target specific users from the Flagsmith dashboard.

To check if a feature exists for a given user Identity:

var user = FeatureUser(identifier: 'bullet_train_sample_user');
bool featureEnabled = await bulletClient.hasFeatureFlag('my_test_feature', user: user);
if (featureEnabled) {
    // run the code to execute enabled feature for given user
} else {
    // run the code when feature switched off
}

To get the configuration value for a feature flag for given a user Identity:

var myRemoteConfig = await bulletClient.getFeatureFlagValue('my_test_feature', user: user);
if (myRemoteConfig != null) {
    // run the code to use remote config value
} else {
    // run the code without remote config
}

To get the user traits for given user Identity:

var userTraits = await bulletClient.getTraits(user)
if (userTraits != null && userTraits) {
    // run the code to use user traits
} else {
    // run the code without user traits
}

To get user trait for given user Identity and specific Trait key:

var userTrait = await bulletClient.getTrait(user, 'cookies_key');
if (userTrait != null) {
    // run the code to use user trait
} else {
    // run the code without user trait
}

Or get user traits for given user Identity and specific Trait keys:

 var userTraits = await bulletClient.getTraits(user, keys: ['cookies_key', 'other_trait']);
if (userTraits != null) {
    // run the code to use user traits
} else {
    // run the code without user traits
}

To update a user trait for given user Identity:

 var userTrait = await bulletClient.getTrait(user, 'cookies_key');
if (userTrait != null) {
    // update value for user trait
    var updatedTrait = userTrait.copyWith(value: 'new value');
    Trait updated = await bulletClient.updateTrait(user, updatedTrait);
} else {
    // run the code without user trait
}

Override default configuration

By default, the client uses the default configuration. You can override this configuration as follows:

var bulletClient = BulletTrainClient(
      config: BulletTrainConfig(
          baseURI: 'http://yoururl.com/'
      ), apiKey: 'YOUR_ENV_API_KEY');

Override the default configuration with your own:

var bulletClient = BulletTrainClient(
      config: BulletTrainConfig(
          baseURI: 'http://yoururl.com/',
          connectTimeout: 200,
          receiveTimeout: 500,
          sendTimeout: 500,
      ), apiKey: 'YOUR_ENV_API_KEY');

Getting Help

If you encounter a bug or feature request we would like to hear about it. Before you submit an issue please search existing issues in order to prevent duplicates.

Get in touch

If you have any questions about our projects you can email support@flagsmith.com.