Querying any member of a Postgres array type in Rails 4

Question

Everywhere I looked there were 2 examples

either

Book.where("'history' = ANY (subjects)")

to query a book with a specific subject in the subject array

or

 Book.where("subjects @> ?", '{'history', 'drama'}')

to query books that the subjects array has both history and drama

How do I query for books that has either history or drama or both?

Answer 1

At the moment I am solving this using

query = subject_list.map do |subject|
                "'#{subject}' = ANY(subjects)"
            end.join(" OR ")

Book.where(query)