Resolvers & data sources

🎯 Your goal is to build a single query for the Module page and confirm that it's returning live data using the Explorer.

To achieve this goal, you'll be implementing new resolvers and updating the data source.

The REST API for our data is located here: https://odyssey-lift-off-rest-api.herokuapp.com/

Data source Tasks

Visit the REST API documentation and find the endpoint we need to use to retrieve a specific module's detailsIn the datasources/track-api file, add a new method to the TrackAPI class called getModuleThe getModule method should take in a moduleId as a parameter and return the results of calling the correct REST API endpoint

Data Source Solution

In datasources/track-api.js, add the following method inside the TrackAPI class:

getModule(moduleId) {
  return this.get(`module/${moduleId}`);
}

Resolver Tasks

In the resolvers file, create a new resolver function for Query.moduleThe Query.module resolver should use the getModule datasource method to return the correct data. What 2 parameters does it need to use to do so?

Resolver Solution

In resolvers.js, inside the Query object:

// get a single module by ID, for the module detail page
module: (_, { id }, { dataSources }) => {
  return dataSources.trackAPI.getModule(id);
};

Query Solution

This query should be working on Studio:

query getModuleAndParentTrack($moduleId: ID!, $trackId: ID!) {
  module(id: $moduleId) {
    id
    title
    content
    videoUrl
  }
  track(id: $trackId) {
    id
    title
    modules {
      id
      title
      length
    }
  }
}

Test these values in the Variables panel:

{
  "trackId": "c_0",
  "moduleId": "l_0"
}

Check your work!

After running the query in Studio, I can see that the title of module with id l_0 is

, and its videoUrl's last 2 characters are

. The module's parent track id c_0 has the title

and it has

modules.

Drag items from this box to the blanks above

10
Cat-stronomy, an introduction
Kitty space suit, all you need to know
Xo
The Night Sky
8
Exploring Time and Space
4
Ox
Ab