Query by Content Relationship
To query by a particular Content Relationship / Document link value, you must use the ID of the document you are looking for.
You must use the document ID
Note that you must use the document ID to make this query. It does not work if you try to query using a UID value.
The following example queries all the "blog_post" custom type documents with the "category_link" field (a Content Relationship) equal to the category document with the ID of "WNje3SUAAEGBu8bc".
response = api.query([
Prismic::Predicates.at("document.type", "blog_post"),
Prismic::Predicates.at("my.blog_post.category_link", "WNje3SUAAEGBu8bc")]
)
# response contains the response object, response.results holds the documents
If your Content Relationship field is inside a group, you just need to specify the Group, then the Content Relationship field.
Here is an example that queries all the "blog_post" custom type documents with the "category_link" field (a Content Relationship) equal to the category with a document ID of "WNje3SUAAEGBu8bc". In this case, the Content Relationship field is inside a Group field with the API ID of "categories".
response = api.query([
Prismic::Predicates.at("document.type", "blog_post"),
Prismic::Predicates.at("my.blog_post.categories.category_link", "WNje3SUAAEGBu8bc")]
)
# response contains the response object, response.results holds the documents