Schema linting in GraphQL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a GraphQL type with a non-nullable String field called 'name'.

GraphQL

type User { name: [1] }

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

AFloat

BInt

CBoolean

DString!

Attempts:

3 left

💡 Hint

Common Mistakes

Using just 'String' without the exclamation mark.

Using a wrong type like 'Int' or 'Boolean' for a name field.

The exclamation mark ! after String means the field is non-nullable, which is required here.

2fill in blank

medium

Complete the code to add a description to the 'User' type using GraphQL schema comments.

GraphQL

"""[1]"""
type User { id: ID! }

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AList of users

BUser ID field

CUser represents a system user

DQuery for users

Attempts:

3 left

💡 Hint

Common Mistakes

Putting a field name instead of a description.

Using single quotes instead of triple quotes.

Triple quotes """""" are used to add descriptions in GraphQL schemas. The description should explain the type.

3fill in blank

hard

Fix the error in the schema by completing the code to define a list of non-nullable 'Post' types inside 'User'.

GraphQL

type User { posts: [[1]]! }

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

APost

BPost!

CPost[]

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'Post' without exclamation mark inside the list.

Using invalid syntax like 'Post[]'.

The Post! inside the list means each post cannot be null. The list itself is non-nullable because of the exclamation mark after the brackets.

4fill in blank

hard

Fill both blanks to define a mutation 'createUser' that takes a non-nullable 'name' argument of type String and returns a 'User'.

GraphQL

type Mutation { createUser(name: [1]): [2] }

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

AString!

BUser

CBoolean

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting the exclamation mark on the argument type.

Returning a wrong type like Boolean or Int.

The argument 'name' must be a non-nullable String, so use String!. The mutation returns a User type.

5fill in blank

hard

Fill all three blanks to define a query 'getUser' that takes a non-nullable 'id' argument of type ID and returns a nullable 'User'.

GraphQL

type Query { getUser(id: [1]): [2] }

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

AID!

BUser

CUser!

DString

Attempts:

3 left

💡 Hint

Common Mistakes

Making the return type non-nullable with an exclamation mark.

Using wrong argument type like String instead of ID.

The 'id' argument must be a non-nullable ID, so use ID!. The query returns a nullable User, so no exclamation mark after User.