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用的has_many保存模型,我为有模型,如轨如何通过关联
// Contains the details of Parties (Users)
class Party < ActiveRecord::Base
has_many :party_races
has_many :races, :through=>:party_races
end
// Contains the party_id and race_id mappings
class PartyRace < ActiveRecord::Base
belongs_to :party
belongs_to :race
end
// Contains list of races like Asian,American,etc..
class Race < ActiveRecord::Base
has_many :party_races
has_many :parties, :through => :party_races
end
现在,让我们说我创建党 party_instance = Party.new
的实例,我怎么加多个种族到party_instance
并保存到数据库?