ids

ids()

Instance Public methods

Pluck all the ID's for the relation using the table's primary key

Person.ids # SELECT people.id FROM people
Person.joins(:companies).ids # SELECT people.id FROM people INNER JOIN companies ON companies.person_id = people.id

Links:

https://github.com/rails/rails/blob/0ef8a244231c355cab7f4d032efed51ef5ddfe99/activerecord/lib/active_record/relation/calculations.rb#L195

doc_ruby_on_rails

2015-06-20 00:00:00

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