我一直在按照本教程acts_as_commentable_with_threading
使用gem实现线程注释。但是,我似乎遇到了质量分配错误,这似乎源于 gem 设置 Comment 模型的方式,我不确定是否应该修改(出于图书馆的初衷)。
错误输出
Can't mass-assign protected attributes: commentable, body, user_id
app/models/comment.rb:20:in `new'
app/models/comment.rb:20:in `build_from'
app/controllers/posts_controller.rb:21:in `show'
post_controller.rb
def show
@post = Post.find(params[:id])
@comments = @post.comment_threads.order('created_at desc')
@new_comment = Comment.build_from(@post, current_user.id, "")
end
评论控制器.rb
class CommentsController < ApplicationController
def create
@comment_hash = params[:comment]
@obj = @comment_hash[:commentable_type].constantize.find(@comment_hash[:commentable_id])
@comment = Comment.build_from(@obj, current_user.id, @comment_hash[:body])
if @comment.save
render :partial => "comments/comment", :locals => { :comment => @comment }, :layout => false, :status => :created
else
flash.now[:error] = 'Comment was not submitted.'
end
end
end
评论.rb
class Comment < ActiveRecord::Base
acts_as_nested_set :scope => [:commentable_id, :commentable_type]
validates :body, :presence => true
validates :user, :presence => true
# NOTE: install the acts_as_votable plugin if you
# want user to vote on the quality of comments.
#acts_as_votable
belongs_to :commentable, :polymorphic => true
# NOTE: Comments belong to a user
belongs_to :user
# Helper class method that allows you to build a comment
# by passing a commentable object, a user_id, and comment text
# example in readme
def self.build_from(obj, user_id, comment)
new \
:commentable => obj,
:body => comment,
:user_id => user_id
end
#helper method to check if a comment has children
def has_children?
self.children.any?
end
# Helper class method to lookup all comments assigned
# to all commentable types for a given user.
scope :find_comments_by_user, lambda { |user|
where(:user_id => user.id).order('created_at DESC')
}
# Helper class method to look up all comments for
# commentable class name and commentable id.
scope :find_comments_for_commentable, lambda { |commentable_str, commentable_id|
where(:commentable_type => commentable_str.to_s, :commentable_id => commentable_id).order('created_at DESC')
}
# Helper class method to look up a commentable object
# given the commentable class name and id
def self.find_commentable(commentable_str, commentable_id)
commentable_str.constantize.find(commentable_id)
end
end