Exercise: Implement a Mutation

Exercise source code

To get the source code for this exercise, run the following command in the project’s repository:

git checkout categories-mutation-exercise

How to start the project

To start the project, follow the same steps from the previous lesson.

Add a new mutation definition

First, we need to add a definition to a new mutation that will allow the creation of a new category. To create a category, our new mutation needs the slug and name parameters, both of type String!.

We add the definition in the server/src/schema.graphql file. We can either pass both parameters separately or combine them in an input type.

Here’s one version of a mutation schema definition: