我有一个模特:
class Comment
include DataMapper::Resource
property :id, Serial
property :comment, Text, :required => true
belongs_to :user
belongs_to :lecture
has n, :replies, :child_key => [:source_id]
has n, :comments, self, :through => :replies, :via => :target
end
我想添加评论作为对另一个已经创建的评论的回复。当我尝试:
lecture = Lecture.get(params[:lecture_id])
comment = Comment.new(:comment => params[:text])
@user.comments << comment
lecture.comments << comment
if !params[:parent].nil? then
parent = Comment.get(params[:parent])
parent.replies << comment
end
第parent.replies << comment
行引发错误:
NoMethodError - undefined method source_id=' for #<Comment @id=nil @comment="asd" @user_id=1 @lecture_id=1>
我的回复模式是:
class Reply
include DataMapper::Resource
belongs_to :source, 'Comment', :key => true
belongs_to :target, 'Comment', :key => true
end
如何正确添加评论作为“回复”?感谢。
答案 0 :(得分:1)
您确定要Reply
型号吗?注释树可以仅构建在一个具有自我关联的模型Comment
上。
class Comment
...
has n, :replies, 'Comment', :child_key => :source_id
belongs_to :source, 'Comment', :required => false
end