我有三个模型：user、guideline 和 favourite_guideline（目的是用户可以创建自己喜欢的指南列表）。
尝试添加收藏夹时出现关联错误
ActiveRecord::HasManyThroughSourceAssociationNotFoundError in GuidelinesController#favourite 在模型 FavouriteGuideline 中找不到源关联 :favourite 或 :favourites。试试 'has_many :favourites, :through => :favourite_guidelines, :source => '。它是 :guideline 还是 :user 之一？
class User < ActiveRecord::Base
has_many :guidelines
has_many :favourite_guidelines
has_many :favourites, through: :favourite_guidelines
end
class Guideline < ActiveRecord::Base
belongs_to :user
has_many :favourite_recipes
has_many :favourited_by, through: :favourite_recipes, source: :user
end
class FavouriteGuideline < ActiveRecord::Base
belongs_to :guideline
belongs_to :user
end
指南控制器中我最喜欢的操作是：
def favourite
type = params[:type]
if type == "favourite"
current_user.favourites << @guideline
redirect_to :back, notice: 'You favourited #{@guideline.name}'
elsif type == "unfavourite"
current_user.favourites.delete(@guideline)
redirect_to :back, notice: 'Unfavourited #{@guideline.name}'
else
# Type missing, nothing happens
redirect_to :back, notice: 'Nothing happened.'
end
end