graphql-auto-requester-datasource

This module provides the graphql-auto-requester as an Apollo DataSource.

Creating a DataSource

There are a few ways to create the DataSource from this library:

Using Introspection

If you wish to use introspection, you can just set the baseURL for your service in the constructor:

class IntrospectedGraphQLService extends GraphQLAutoRequesterDataSource {
  constructor() {
    this.baseURL = 'https://example.com/'
  }
}

Using A Schema Document

If you wish to use a schema document, you must set the baseURL for your service in the constructor and provide the schema document as a property on the class itself:

class SchemaDocumentGraphQLService extends GraphQLAutoRequesterDataSource {
  constructor() {
    this.baseURL = 'https://example.com/'
  }
}

SchemaDocumentGraphQLService.schemaDocument = `
  type Query {
    example: Int!
  }
`

Using An executable Schema

If you wish to use an executable schema, you can set the executableSchema property in the constructor:

class ExecutableSchemaGraphQLService extends GraphQLAutoRequesterDataSource {
  constructor() {
    this.executableSchema = myExecutableSchema
  }
}

Usage as a DataSource:

Once you have your DataSource configured in your Apollo Server initialization, you can then access the .query property from the dataSources key in your resolvers to start a query against the upstream service. For more information on the usage of the graphql-auto-requester see its documentation.

const resolvers = {
  Query: {
    anExample: (_, _, { dataSources }) => {
      // Resolves the Query.example field on the upstream service
      return dataSources.schemaDocumentGraphQLService.query.example
    }
  }
}