Ruby on Rails：发现不允许的参数：_method、authenticity_token

Question

我使用本指南作为从头开始创建消息传递系统的起点。

一切正常。但出于某种原因，每当我现在尝试通过在我的视图中单击以下链接来创建新对话时

<%= link_to 'Message me', conversations_path(sender_id: current_user.id, recipient_id: @user.id), class: 'btn btn-primary', method: :post %>

我遇到错误：

found unpermitted parameters: _method, authenticity_token

这里是参数：

{"_method"=>"post", "authenticity_token"=>"BL2XeA6BSjYliU2/rbdZiSnOj1N5/VMRhRIgN8LEXYPyWfxyiBM1SjYPofq7qO4+aqMhgojvnYyDyeLTcerrSQ==", "recipient_id"=>"1", "sender_id"=>"30", "controller"=>"conversations", "action"=>"create"}

我被定向到params.permit我的控制器中的行：

class ConversationsController < ApplicationController
  before_action :authenticate_user!

  # GET /conversations
  # GET /conversations.json
  def index
    @users = User.all

    # Restrict to conversations with at least one message and sort by last updated
    @conversations = Conversation.joins(:messages).uniq.order('updated_at DESC')
  end

  # POST /conversations
  # POST /conversations.json
  def create
    if Conversation.between(params[:sender_id], params[:recipient_id]).present?
      @conversation = Conversation.between(params[:sender_id], params[:recipient_id]).first
    else
      @conversation = Conversation.create!(conversation_params)
    end

    redirect_to conversation_messages_path(@conversation)
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def conversation_params
      params.permit(:sender_id, :recipient_id)
    end
end

奇怪的是，我之前没有这个问题，我也没有做任何改变。可能是什么问题？

Answer 1

你的参数可能应该这样定义：

def conversation_params
  params.require(:conversation).permit(:sender_id, :recipient_id)
end

这应该确保表单自动生成的其他隐藏参数不会被阻止。