Rails Cookie和session使用

Rails通过cookies方法来操作cookie。这和session的操作有点相似

class CommentsController < ApplicationController
  def new
    # 假如cookie中有评论者的姓名，则自己主动调用
    @comment = Comment.new(author: cookies[:commenter_name])
  end

  def create
    @comment = Comment.new(params[:comment])
    if @comment.save
      flash[:notice] = "Thanks for your comment!"
      if params[:remember_name]
        # 设置cookie
        cookies[:commenter_name] = @comment.author
      else
        # 删除cookie中的变量
        cookies.delete(:commenter_name)
      end
      redirect_to @comment.article
    else
      render action: "new"
    end
  end
end

这里须要注意的是，和操作session不一样。删除cookie中的变量时不能简单的设置值为nil，而是须要显示的调用cookie.delete(:key)方法