ruby 多态find_blablaable

Posted 2021-05-16

class Like < ActiveRecord::Base
    attr_accessible :user, :likeable

    validates :user, :likable,  {
        presence: true
    }
    belongs_to :likeable, :polymorphic => true
    belongs_to :user
    validates_uniqueness_of :user_id, :scope => [:likeable_id, :likeable_type]

end

#controller
#The Ryan Bates:

def create
    @likeable = find_likeable
        @user = current_user
        @like = @user.likes.build(likeable: @likeable)

        if @like.save
            redirect_to @likeable, notice: "Liked!"
        else
            redirect_to @likeable, notice: "Not liked!"
        end
end

private

def load_commentable
    resource, id = request.path.split('/')[1, 2]
    @commentable = resource.singularize.classify.constantize.find(id)
end


#The Single Resource:

private

def find_likeable
  params.each do |name, value|
    if name =~ /(.+)_id$/
      return $1.classify.constantize.find(value)
    end
  end
  nil
end

#The Nested Resource:
def create
    @likeable_parent, @likeable_child = find_likeable
    @user = current_user

    if @likeable_child == nil
      @like = @user.likes.build(likeable: @likeable_parent)
    else
      @like = @user.likes.build(likeable: @likeable_child)
    end

    if @like.save
        redirect_to @likeable_parent, notice: "Liked!"
    else
        redirect_to @likeable_parent, notice: "Not liked!"
    end
end

private

def find_likeable
    likeable = []
    params.each do |name, value|
      if name =~ /(.+)_id$/
        likeable.push($1.classify.constantize.find(value))
      end
    end
    return likeable[0], likeable[1] if likeable.length > 1
    return likeable[0], nil if likeable.length == 1
    nil
end