Categories and Tags
Learn how to interact with Categories and Tags using WPGraphQL
Categories and Tags are core Taxonomy Types in WordPress and allow content to be grouped. Each individual Category or Tag is known as a "Term".
Terms are exposed to the WPGraphQL Schema by default. On this page are some examples of interacting with Categories and Tags using WPGraphQL.
Queries
WPGraphQL comes with RootQuery fields built-in to query Tags and Categories. You can query for lists of Terms, an individual term, and even Post Objects related to Terms.
List Of Tags
In this example, we query a list of Tag nodes. By default, WPGraphQL will return 10 items.
GraphiQL Loading...In this example, we query a list of Category nodes. By default, WPGraphQL will return 10 items.
GraphiQL Loading...Related Objects
Tags are associated with Posts (and possibly other Post Types). Any Post Type that is registered to be connected with Tags can be queried for as a connection to tags.
Below is an example of asking for a list of Tags, and on each Tag, a list of posts it's connected to.
GraphiQL Loading...The same can be done with categories:
GraphiQL Loading...Hierarchical Taxonomies
One key difference between Tags and Categories is that Categories are hierarchical, meaning they can have parent and child relationships.
When querying Categories, by default all terms will be returned regardless of their hierarchy. Both parent and child terms will be returned.
Executing the query below will show terms with no parent and terms with a parent. It is then the client's responsibility to convert the flat list back into hierarchy if necessary for the consuming application.
GraphiQL Loading...Sometimes, it makes sense to query for terms in a hierarchical manner, accessing just the top level nodes first, then the children and so on. That can be done by asking for just the top level terms using the parent, like so:
GraphiQL Loading...Mutations
Categories and Tags can also be created, updated and deleted via GraphQL mutations.
PostObjects can also be associated with Categories and Tags.
Create Tag
This is an example of creating a tag:
GraphiQL Loading...Create Category
This is an example of creating a category:
GraphiQL Loading...Update Tag
In order to update a Tag, you must pass the ID.
This is an example of updating a tag:
GraphiQL Loading...Update Category
In order to update a Category, you must pass the ID.
This is an example of updating a category:
GraphiQL Loading...Delete Tag
In order to delete a Tag, you must pass the ID.
This is an example of deleting a tag:
GraphiQL Loading...Delete Category
In order to delete a Category, you must pass the ID.
This is an example of deleting a category:
GraphiQL Loading...Add Tag to Post
This is an example of a mutation to update a Post and add a tag to it.
Here we pass the ID of the Post we want to update, and an array of Tag nodes we want to append to the Post. We can use tag names or tag IDs to attach to posts.
You can also attach terms in the createPost mutation.