ActiveModel::ForbiddenAttributesError

Question

我一直在遵循rails指南创建和安装一个引擎这里.Created博客文章，当我试图评论时，它返回了"ActiveModel::ForbiddenAttributesError in Blorgh::CommentsController#create“错误。注释控制器

    require_dependency "blorgh/application_controller"

module Blorgh
  class CommentsController < ApplicationController
    def create
      @post = Post.find(params[:post_id])
      @comment = @post.comments.create(params[:comment])
      flash[:notice] = "Comment has been created!"
      redirect_to posts_path
    end
  end
end

下面是评论模型

 module Blorgh
  class Comment < ActiveRecord::Base

  end
end

如何解决这个问题？

Answer 1

我猜您使用的是rails 4。您需要在这里标记所有必需的参数，如下所示：

   def create
      @post = Post.find(params[:post_id])
      @comment = @post.comments.create(post_params)
      flash[:notice] = "Comment has been created!"
      redirect_to posts_path
    end

    def post_params
      params.require(:blorgh).permit(:comment)
    end

希望此链接能帮上忙。

Answer 2

我也犯了同样的错误。因此，如果您删除了params，那么很容易看到带有文本键的嵌套注释params。似乎本教程是针对Rails 3的，因此对于rails 4方法，需要进行的更改是添加comment_params方法，如下所示。

Parameters:

  {"utf8"=>"✓",
  "authenticity_token"=>"uOCbFaF4MMAHkaxjZTtinRIOlpMj2QSOYf+Ugn5EMUI=",
  "comment"=>{"text"=>"asfsadf"},
  "commit"=>"Create Comment",
  "post_id"=>"1"}

    def create
      @post = Post.find(params[:post_id])
      @comment = @post.comments.create(comment_params)
      flash[:notice] = "Comment has been created!"
      redirect_to posts_path
    end

    private

      # Only allow a trusted parameter "white list" through.
      def comment_params
        params.require(:comment).permit(:text)                
      end