Error classification in GraphQL - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define a GraphQL error type with a message field.

GraphQL

type Error { message: [1] }

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AInt

BString!

CBoolean

DFloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using Int or Boolean instead of String for error messages.

Forgetting the exclamation mark to make the field required.

The message field should be a non-nullable string to hold error messages.

2fill in blank

medium

Complete the code to define a GraphQL query that returns a list of errors.

GraphQL

type Query { errors: [[1]!]! }

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ABoolean

BString

CError

DInt

Attempts:

3 left

💡 Hint

Common Mistakes

Using String or Int instead of the Error type.

Not marking the list or its items as non-nullable.

The query returns a non-nullable list of non-nullable Error objects.

3fill in blank

hard

Fix the error in the mutation definition to accept an error message as input.

GraphQL

type Mutation { addError(message: [1]): Error }

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AString

BBoolean

CInt

DFloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-string types for the message argument.

Omitting the argument type.

The message argument should be a string to accept text input.

4fill in blank

hard

Fill both blanks to define an input type for error classification with a code and message.

GraphQL

input ErrorInput { code: [1] message: [2] }

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AInt!

BString

CString!

DBoolean

Attempts:

3 left

💡 Hint

Common Mistakes

Using nullable types when fields should be required.

Using Boolean for message instead of String.

The code is a non-nullable integer and message is a non-nullable string.

5fill in blank

hard

Fill all three blanks to define a mutation that accepts ErrorInput and returns an Error.

GraphQL

type Mutation { createError(input: [1]): [2] }

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AErrorInput!

BError

CError!

DErrorInput

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting exclamation marks for required input or output.

Mixing input and output types.

The mutation takes a non-nullable ErrorInput and returns a non-nullable Error.