Invalid source reflection macro :has_many :through

Question

I have such angry associations: financings >- events >- subprograms >- programs. I want to get acces to last_financings from programs through all of them so code is:

<         


        

Answer 1

As far as I remember you can't make association with double (or more) :through. The only thing you can do is write your own sql queries.

Here is my example how to do it:

class Person
  ...
  has_many :teams, :finder_sql =>
    'SELECT DISTINCT teams.* FROM teams
        INNER JOIN team_roles ON teams.id = team_roles.team_id
        INNER JOIN team_members ON team_roles.id = team_members.role_id
        WHERE ((team_members.person_id = #{id}))'

  # other standard associations
  has_many :team_members
  has_many :team_roles,
    :through => :team_members
  # and I couldn't do:
  # has_many :teams, :through => :team_roles

This is for relation Person -> has_many -> team_members -> has_many -> team_roles -> has_one - team.

Hope it helps.