method
associated
v7.1.3.2 -
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- Class:
ActiveRecord::QueryMethods::WhereChain
associated(*associations)public
Returns a new relation with joins and where clause to identify associated relations.
For example, posts that are associated to a related author:
Post.where.associated(:author) # SELECT "posts".* FROM "posts" # INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" # WHERE "authors"."id" IS NOT NULL
Additionally, multiple relations can be combined. This will return posts associated to both an author and any comments:
Post.where.associated(:author, :comments) # SELECT "posts".* FROM "posts" # INNER JOIN "authors" ON "authors"."id" = "posts"."author_id" # INNER JOIN "comments" ON "comments"."post_id" = "posts"."id" # WHERE "authors"."id" IS NOT NULL AND "comments"."id" IS NOT NULL
