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ruby-on-rails - Rails & Devise：删除用户帐户后聊天崩溃

问题描述

我将 Devise 用于我的应用程序身份验证，然后将聊天（对话/消息）功能集成到我的应用程序中。聊天工作正常，但是一旦我删除了与之聊天的用户，聊天页面就会崩溃，因为它“找不到用户 id = 1”（ActiveRecord 错误）

我的conversations controller：

class ConversationsController < ApplicationController
    before_action :authenticate_user!

    def index
        @users = User.all
        @conversations = Conversation.all
    end

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

我的mesages controller：

class MessagesController < ApplicationController
    before_action do
    @conversation = Conversation.find(params[:conversation_id])
    end

    def index
        @messages = @conversation.messages
        @message = @conversation.messages.new
    end

    def new
        @message = @conversation.messages.new
    end

    def create
        @message = @conversation.messages.new(message_params)
        if @message.save
            redirect_to conversation_messages_path(@conversation)
        end
    end

    private
    def message_params
        params.require(:message).permit(:body, :user_id)
    end
end

我的conversation model：

class Conversation < ActiveRecord::Base
    belongs_to :sender, :foreign_key => :sender_id, class_name: 'User'
    belongs_to :recipient, :foreign_key => :recipient_id, class_name: 'User'

    has_many :messages, dependent: :destroy
    validates_uniqueness_of :sender_id, :scope => :recipient_id

    scope :between, -> (sender_id, recipient_id) do
        where("(conversations.sender_id = ? AND conversations.recipient_id = ?) OR (conversations.sender_id = ? AND conversations.recipient_id = ?)", sender_id, recipient_id, recipient_id, sender_id)
    end
end

我的message model：

class Message < ActiveRecord::Base
    belongs_to :conversation
    belongs_to :user

    validates_presence_of :body, :conversation_id, :user_id

    def message_time
        created_at.strftime("%m/%d/%y at %l:%M %p")
    end
end

我添加了基于文档的标准方式设计，然后添加了聊天。

更新：

代码在这一行崩溃：（views/conversations/index.html.erb）

<% @conversations.each do |conversation| %>
      <% if conversation.sender_id == current_user.id || conversation.recipient_id == current_user.id %>
       <% if conversation.sender_id == current_user.id %>
         <% recipient = User.find(conversation.recipient_id) %>
       <% else %>
         <% recipient = User.find(conversation.sender_id) %>
       <% end %>
       <h3><%= link_to recipient.email, conversation_messages_path(conversation)%></h3>
      <% end %>
     <% end %>

具体在<% recipient = User.find(conversation.sender_id) %>

关于删除用户功能的工作原理，我没有编写代码，我只是让 Devise 做它的事情

标签： ruby-on-railsdevise

解决方案

  1. 添加到对话中，您可以belongs_to选择：true。因为发件人/收件人可以被删除
  2. 处理它们是“nil”并显示“deleted”标签
  3. 尝试做recipient = User.find_by(id: conversation.recipient_id) %> or conversation.recipient（只使用关联）......并检查对象是否为零

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