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    ember-cli-mirage-graphql

    0.3.3 • Public • Published

    Mock GraphQL with Ember CLI Mirage

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    This addon is for mocking GraphQL with Ember CLI Mirage.

    Compatibility

    This addon should work with any version of Ember 2.0 and up as well as Ember CLI Mirage v0.4.7 to v1.1.x; however, we only test with Ember.js v3.12, v3.16 and up.

    Note

    This addon is very early in its development and the code currently supports limited use cases. If you would like to contribute, don't be afraid to trample any existing code. It's quite trampleable.

    Installation

    ember install ember-cli-mirage
    ember install ember-cli-mirage-graphql

    How It Works

    This addon creates a request handler for use with Mirage that takes your GraphQL schema and creates mocks accordingly. In its simplest form, the mocks query data from Mirage's database, by type, and optionally filter records by matching query variables.

    Example Usage

    Quick Example

    See the dummy app in this addon's tests folder for a complete example. Open the Mirage folder and notice the added handlers folder. This is where we created the GraphQL request handler callback. It can be imported in the Mirage config for use with your GraphQL request handler.

    Note: There is no need to create a separate module for your handler, as we did, but we think it's nice to keep all the handler options out of the Mirage config.

    Basic Example

    If you're like us, you'll want to create your handler aside from your Mirage config:

    // /mirage/handlers/graphql.js or wherever you like
     
    import createGraphQLHandler from 'ember-cli-mirage-graphql/handler';
    import schema from 'app-name/path-to-your-schema';
     
    export default createGraphQLHandler(schema, /* options = {} */);

    Notes:

    • We use a simple command line tool to download our schema: get-graphql-schema.
    • You can import and pass in your raw schema directly, as shown above, or you can pass in an instance of a GraphQLSchema, e.g., a case where you might merge multiple schemas.

    Then import your handler for use in your Mirage config:

    // /mirage/config.js
     
    import graphQLHandler from './handlers/graphql';
     
    export default function() {
      this.post('/path-to-graphql', graphQLHandler);
    }

    Handler Options

    You may pass in options when creating a request handler. The options take the form of a hash and may contain the following:

    {
      /*
        `fieldsMap` is used if you need to map a field defined in your
        GraphQL schema to a different field for a record in your Mirage
        database.
     
        This can happen if, for example, you are migrating from a JSON
        API backend to GraphQL and there are model name conflicts.
     
        In this example the mapping is for a relationship; however, you
        may map any field type.
     
        String values will be used to map field names from your query to
        match those in your Mirage database.
     
        Method values will be used to filter records and will run after
        any variable filtering and related data fetching. This allows for
        complex record filtering that can't be done with variables alone.
        The methods receive 3 arguments:
     
        1. The resolved records, if any.
        2. Mirage's database.
        3. Its parent record, if any.
       */
      fieldsMap: {
        Person: { // fields are mapped on a per-type basis
          pets: 'animals'
        }
      },
      /*
        `mutations` is an object used to mock mutation functionality you
        might expect from the server. Each method maps directly to a
        named mutation from your schema and receives 3 arguments:
     
        1. The table from Mirage's database that corresponds to the return
        type of the mutation.
        2. The mutation arguments. These will be mapped per the argsMap
        option, by the return type, if appropriate.
        3. Mirage's database.
     
        For now, this is the only way to mock mutations with this addon;
        however, we will try to implement some form of default mutation
        functionality, if feasible.
       */
      mutations: {
        updatePerson: (people, args, db) => {
          let { id, personAttributes } = args;
     
          return [ people.update(id, personAttributes) ];
        }
      },
      /*
        argsMap is used if you need to map arguments defined in your GraphQL
        queries to something other than the corresponding field name on the
        Mirage record. The value you specify in the map can be a string or a
        function.
     
        The addon uses the arguments to filter records of the given
        type from Mirage's database.
     
        String values will be used to map argument names to field names
        in case the argument name differs.
     
        Function values will be used to filter records. The function
        will be passed an array of records, the argument name (key)
        and the argument value.
       */
      argsMap: {
        Person: { // arguments are mapped on a per-type basis
          pageSize: (records, _, pageSize) => records.slice(0, pageSize)
        }
      },
      /*
      `scalarMocks` is used if you have custom scalars and you need to mock them to
       return a default value
      */
      scalarMocks: {
        MyCustomScalar: () => {
          return 'some custom value'
        }
      }
    }

    Contributing

    Any contributors are most welcome!

    Please file issues, as appropriate. Feature requests would be nice in the form of use cases. Knowing how you are using GraphQL should help contributors make the addon more capable.

    PRs are also welcome, provided they relate to an issue or add functionality for a certain use case, and should generally follow the same coding style as the rest of the addon.

    See the Contributing guide for details.

    Keywords

    Install

    npm i ember-cli-mirage-graphql

    DownloadsWeekly Downloads

    152

    Version

    0.3.3

    License

    MIT

    Unpacked Size

    45.1 kB

    Total Files

    43

    Last publish

    Collaborators

    • rocky.neurock