Rails join with where using AND instead of OR - ruby-on-rails

Question

I have a scope (where title is an array)
scope :with_label, ->(title) { joins(:labels).where(labels: { title: title }) }
By default this does an AND query. How can I get this to do an OR query? I can't seem to find any examples of this.
I believe this is the SQL that is generated:
Label Load (0.1ms) SELECT "labels".* FROM "labels" WHERE "labels"."project_id" = $1 AND "labels"."title" = $2 ORDER BY "labels"."title" ASC LIMIT 1 [["project_id", 8], ["title", "label1,label2,label3"]]

Answer 1

Rails/ActiveRecord only supports OR queries in Rails 5. In earlier versions, you need to use a SQL string to achieve an OR query:
Widget.where("name = ? OR name = ?", "foo", "bar") # postgres
When there are many possibilities, the same thing can be accomplished more efficiently with an IN query, which is generated in ActiveRecord by passing an array with more than one element to the #where method:
arr = ["foo", "bar", "baz"]
Widget.where(name: arr)
As for the SQL output you've posted:
Label Load (0.1ms) SELECT "labels".* FROM "labels" WHERE "labels"."project_id" = $1 AND "labels"."title" = $2 ORDER BY "labels"."title" ASC LIMIT 1 [["project_id", 8], ["title", "label1,label2,label3"]]
The AND here is coming from the fact that a query is being made against the product_id as well as the title, not because of anything to do with title.