Accepts_nested_attributes_for via a connection table with attributes in the connection

Question

How can I use the ActiveRecord accepts_nested_attributes_for helper in has_many: through association when adding attributes to the connection table?

For example, let's say I have a Team model:

class Team < ActiveRecord::Base
  role = Role.find_by_name('player')
  has_many  :players,
            :through    => :interactions, 
            :source     => :user, 
            :conditions => ["interactions.role_id = ?", role.id] do
              class_eval do
                define_method("<<") do |r|                                                             
                  Interaction.send(:with_scope, :create => {:role_id => role.id}) { self.concat r }
                end
              end
            end
end

The has_many command is playersthrough interactions, because the user can take several roles (player, manager, etc.).

How can I use accepts_nested_attributes_for while adding attributes to the connection table?

If I have an existing command entry teamand an existing user entry user, I can do something like this:

team.players << user
team.players.size 
=> 1

But if I create a new team with an embedded player:

team = Team.create(:name => "New York Lions", 
                   :players_attributes => [{:name => 'John Doe'}])
team.players.size
=> 0

, ( ), interactions.role_id .

Answer 1

class Team < ActiveRecord::Base
  accepts_nested_attributes_for :interactions

class Interaction < ActiveRecord::Base
  accepts_nested_attributes_for :players


team = Team.create(:name => "New York Lions", :interactions_attribues => [{
                   :players_attributes => [{:name => 'John Doe'}]}])

, , . accepts_nested_attributes Team Interaction.