React relay rebind is a component-scope state management for Relay modern & React.

React-Relay-Rebind is a local state managment for React components which use Relay. Focus of React Relay Rebind is to handle data resolved with Relay mutations and provide it to a component. Component will recieve a state prop for each rebinded mutation. The API declaratively passes down state to components thus simplifying the data flow. The common usecase is non-persistent/local data (e.g UI state) which does not belong and does not deserve to be mixed with persistent data.

⚠️ Warning: Do not use in production! RRR is highly experimental, please stand by until 1.0.0 is released.

• Automagically provide dispatch to commitMutation
• Simplify state configuration
• Subscribe to specific piece of state
• Optional state alias

Yarn

$ yarn add react-relay-rebind

NPM

$ npm install --save react-relay-rebind

or build from source

$ git clone react-relay-rebind
$ cd react-relay-rebind && yarn install
$ yarn run build

Provide dispatch to the commitMutation

import { commitMutation } from 'react-relay-rebind';

const mutation = graphql`
  mutation LoginMutation($input: LoginInput!) {
    login(credentials: $input) {
      errors {
        username
        password
      }
    }
  }
`;

const loginMutation = (environment, input, dispatch) => { // dispatch is passed as the last argument
  commitMutation(
    environment,
    {
      mutation,
      variables: input,
    },
    dispatch // provide dispatch to the the commitMutation
  );
}

export default loginMutation;

Rebind mutations with the component

import { rebind } from 'react-relay-rebind';
import { loginMutation } from './loginMutation';

class MyComponent extends React.component {

  handleSubmit(){
    this.props.mutations.login(this.props.relay, this.state);
  }

  handleFieldChange(fieldName){
    return (e) => {
      // Login mutation stateProxy
      const { login } = this.props;

      this.setState({ [fieldName]: e.target.value() });

      // Set login mutation to initial state
      this.login.resetState();
    }
  }

  render(){
    const { errors } = this.props.login.state;
    const usernameClassname = errors.username ? 'has-error' : '';
    const passwordClassname = errors.password ? 'has-error' : '';

    return (
       <div>
        <input
          className={usernameClassname}
          name="username"
          type="text"
          onChange={this.handleFieldChange('username')}
          value={username} />
        <br/>
        <input
          className={passwordClassname}
          name="password"
          type="password"
          onChange={this.handleFieldChange('password')}
          value={password} />
        <br/>
        <input type="submit" onClick={this.handleSubmit} value="Login"/>
      </div>
  }
}

const mutations = {
  login: {
    mutation: LoginMutation,
    initialState: {
      errors: {
        username: null,
        password: null,
      },
    },
  },
};
export default rebind(mutations)(MyComponent);

rebind(mutations: mutationsConfiguration)(component: Component): Component

Binds mutations with a component. Composed component will recieve a state proxy as a prop for each mutation specified in the mutations configuration.

    {
      mutationName : {
        mutation: function,
        initialState: <any>,
      }
    }

Mutations configuration object contains a property for each mutation binding. Property name be the same as the graphql's mutation name.

• mutationName: A graphql mutation name.
• mutation function: A function called by the mutation handler in a component. Mutation function will be provided with a dispatch function as the last argument. Mutation function could be a commitMutation or a function that calls commitMutation but then you must provide a dispatch to the commitMutation as the last argument.
• initialState: default mutation state.

commitMutation(environment, config, dispatch)

Commits a mutation and dispatches resolved data to a binded component. This function is almost identical to the Relays commitMutation except that it expectes a dispatch function as a third argument.

StateProxy {
  state,
  setState(state),
  resetState()
}

A state proxy is used to read & update a mutation state.

• state: mutation state
• setState(): sets mutation state
• resetState(): sets mutation state to the initialState

props.mutations.mutationName

A binded component will recieve mutations prop which contains a mutation handler for each binded mutation. Mutation handler is used to call the mutation defined in the mutation configuration

dispatch(state)

A function that updates a mutation state and causes the component to recieve new mutation state

Contributions are welcomed! It's suggested to create an issue beforehand to shed some light to others on what kind of change you are working on. Fork, improve & create a pull request.

Use yarn run lint to run a lint

Use yarn run test:cover to run tests

Please build locally before submitting a PR.

• Ante Gulin