How to write a joins query in rails for polymorphic links?

Question

Ruby on Rails

There are models

class Entry< ActiveRecord::Base
  belongs_to :record, polymorphic: true
end

class EntrySpecial< ActiveRecord::Base
  has_one :entry, as: :record
end

I just can't compose a joins query that would select those Entry that satisfy certain conditions, refer to EntrySpecial, and whose EntrySpecial has certain properties
Ruby 2.0 Rails 414

Answer 1

solved the problem a bit

class Entry< ActiveRecord::Base
  belongs_to :record, polymorphic: true
  belongs_to :entry_special, foregin_key: 'record_id'
end

After that, it became possible to compose a "classic" join via activerecord.
But it looks like a crutch.

Answer 2

I recommend using gem squeel. It's
done like this: Entry.joins { record(EntrySpecial) }
And then you can include selection conditions.