The Course Data

Overview

The course API is the same fictional insurance company you worked on in GraphQL 101. It holds three kinds of data:

• Policyholders: the company’s customers
• Policies: the insurance each policyholder owns (auto, home, life, or renters)
• Claims: requests for payment against a policy, such as after a car accident

This page shows the data the API starts with. Field names are shown exactly as you’d use them in a query.

Policyholders

Policies

Policies also have two fields that aren’t stored, but calculated when you ask for them:

• annualPremium: monthlyPremium × 12
• totalClaimed: the total amount of the policy’s approved claims. Open and denied claims don’t count.

Claims

How the data is connected

• Each policy belongs to one policyholder, and a policyholder can have several policies. Maria Alvarez has both an auto and a home policy.
• Each claim belongs to one policy, and a policy can have several claims. AUTO-100001 has two claims, and LIFE-100004 has none.

In a query, you follow these connections with nested fields. From a policyholder you can reach their policies, and from each policy its claims, all in one request. You can also go the other way, from a claim to its policy and on to the policyholder.

Good to know

• Your changes are saved. Policies and claims you add are written to services/policies/data.json and services/policies/claims.json, so they’re still there after the server restarts. To go back to the starting data, stop the server, run npm run reset-data in services/policies, and start it again.
• Amounts are in US dollars. The API returns them as numbers, so trailing zeros are dropped: 975.25 comes back as 975.25, but 1250.00 comes back as 1250.