ruby-on-rails - f.collection_select 来自 rails 3 中的 2 个表

Question

我有这个代码行 <%= f.collection_select :owner_ids, Owner.order(:id), :id, :name, {}, {multiple: true} %>，它以大众媒体形式返回所有者列表，但我还需要在这个领域也包括公司，所以我也可以在同一个列表中包含公司，因为可以拥有大众媒体频道由个人或公司。

公司.rb

class Company < ActiveRecord::Base

  has_many :ownerships
  has_many :massmedia, through: :ownerships
  has_many :owners, through: :ownerships
end

所有者.rb

class Owner < ActiveRecord::Base

  has_many :ownerships
  has_many :massmedia, through: :ownerships
  has_many :companies, through: :ownerships
end

大众媒体.rb

class Massmedium < ActiveRecord::Base
  belongs_to :category

  has_many :ownerships
  has_many :owners, through: :ownerships
  has_many :companies, through: :ownerships

end

Answer 1

= f.select :owners, options_for_select((Owner.all + Company.all)
  .collect{|o| [o.name, "#{o.class},#{o.id}"], {multiple: true}

您必须在模型中定义owners=(values)方法，该方法将解析 ["Company,1","Owner,2"] 等值