Why relationships model real data in GraphQL - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a GraphQL type for a user with an ID field.

GraphQL

type User { id: [1] }

Drag options to blanks, or click blank then click option'

AID!

BString

CInt

DBoolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using String instead of ID for unique identifiers.

Omitting the non-nullable exclamation mark.

The ID! type is used to uniquely identify a user and is non-nullable.

2fill in blank

medium

Complete the code to add a posts field to the User type representing a list of posts.

GraphQL

type User { posts: [1] }

Drag options to blanks, or click blank then click option'

A[Post!]

BPost

C[Post]

DPost!

Attempts:

3 left

💡 Hint

Common Mistakes

Using a single Post type instead of a list.

Not marking the posts as non-nullable inside the list.

The [Post!] syntax means a list of non-null Post objects, modeling multiple posts related to a user.

3fill in blank

hard

Fix the error in the Post type by completing the author field to link back to the User type.

GraphQL

type Post { author: [1] }

Drag options to blanks, or click blank then click option'

A[User]

BID

CUser!

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using a list of users instead of a single user.

Using String or ID instead of User type.

The User! type means each post must have exactly one author, linking the post to a user.

4fill in blank

hard

Fill both blanks to define a Comment type with an author and a post it belongs to.

GraphQL

type Comment { author: [1] post: [2] }

Drag options to blanks, or click blank then click option'

AUser!

BPost!

C[User]

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Using lists instead of single types.

Using String instead of User or Post types.

Each comment has one author (User!) and belongs to one post (Post!), modeling real relationships.

5fill in blank

hard

Fill all three blanks to define a schema with User, Post, and Comment types showing their relationships.

GraphQL

type User { posts: [1] } type Post { author: [2] comments: [3] }

Drag options to blanks, or click blank then click option'

A[Post!]

BUser!

C[Comment!]

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up lists and single types.

Using nullable types where non-null is needed.

The User has many posts ([Post!]), each Post has one author (User!) and many comments ([Comment!]), modeling real-world data relationships.