Update mutation pattern in GraphQL - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is an update mutation in GraphQL?

An update mutation is a GraphQL operation that changes existing data on the server, such as modifying a record's fields.

beginner

In an update mutation, why do we usually provide an id or unique identifier?

The id tells the server which specific record to update, ensuring the correct data is changed.

beginner

What does the input argument typically contain in an update mutation?

It contains the new values for the fields you want to change in the record.

beginner

Why is it important to specify the fields you want back in the response after an update mutation?

To confirm the update worked and to get the latest data from the server.

beginner

Show a simple example of an update mutation to change a user's email.

mutation { updateUser(id: "123", input: { email: "[e-mail]" }) { id email } }

What is the main purpose of an update mutation in GraphQL?

A To change existing data on the server

B To delete data from the server

C To create new data on the server

D To retrieve data from the server

Update mutations are used to change existing data, not to retrieve, delete, or create new data.

Which argument usually identifies the record to update in a mutation?

A id

B input

C fields

D type

The 'id' argument uniquely identifies which record to update.

What should you include in the mutation response to verify the update?

A Only the id

B The updated fields

C The server status code

D Nothing, response is empty

Including updated fields in the response confirms the changes.

In the mutation syntax, where do you put the new values for the update?

A In the query name

B In the response fields

C In the input argument

D In the variables section only

New values are passed inside the input argument.

Which of these is a valid update mutation example?

A mutation { deleteUser(id: "1") { id } }

B query { updateUser(id: "1") { name } }

C mutation { createUser(input: { name: "Alice" }) { id } }

D mutation { updateUser(id: "1", input: { name: "Alice" }) { id name } }

Option D correctly shows an update mutation with id and input.

Explain the steps to write an update mutation in GraphQL.

Think about what you need to tell the server to change and what you want back.

Describe why it is helpful to request updated fields in the mutation response.

Imagine you want to see the changes immediately after updating.