我有一个带有实习消息系统的rails应用程序。用户可以向其他用户发送消息。示例：用户1发送消息用户2可以回答反之亦然。
一切都很完美。但我想用notfications functionnality升级这个系统。我想输入通知：
1）在导航栏上 2）通过邮件
问题：我不知道如何做到这一点。
你能帮助我吗？
对话表
class CreateConversations < ActiveRecord::Migration
def change
create_table :conversations do |t|
t.integer :sender_id
t.integer :recipient_id
t.timestamps
end
end
end
消息表。在这段代码中我有一个布尔值：read。我认为解决方案可以在这里。你怎么看待这个？
class CreateMessages < ActiveRecord::Migration
def change
create_table :messages do |t|
t.text :body
t.references :conversation, index: true
t.references :user, index: true
t.boolean :read, :default => false
t.timestamps
end
end
end
conversation.rb
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
Message.rb
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
conversations_controller.rb
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[:conversation][:sender_id], params[:conversation][:recipient_id]).present?
@conversation = Conversation.between(params[:conversation][:sender_id], params[:conversation][: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.require(:conversation).permit(:sender_id, :recipient_id)
end
end
messages_controller.rb
class MessagesController < ApplicationController
before_action do
@conversation = Conversation.find(params[:conversation_id])
end
def index
@messages = @conversation.messages
if @messages.length > 10
@over_ten = true
@messages = @messages[-10..-1]
end
if params[:m]
@over_ten = false
@messages = @conversation.messages
end
if @messages.last
if @messages.last.user_id != current_user.id
@messages.last.read = true;
end
end
@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
/conversations/index.html.erb
<div class="ui segment">
<h3>Mailbox</h3>
<div class="ui list">
<div class="item">
<% @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 %>
Conversation avec <%= link_to recipient.prenom, conversation_messages_path(conversation)%>
<% end %>
<% end %>
</div>
</div>
</div>
<div class="ui segment">
<h3>All Users</h3>
<div class="ui list">
<% @users.each do |user| %>
<% if user.id != current_user.id %>
<div class="item">
<%= user.prenom %> <%= button_to 'Message me', conversations_path(conversation: { sender_id: current_user.id, recipient_id: user.id }), class: 'btn btn-primary m-t' %>
</div>
<% end %>
<% end %>
</div>
</div>
消息/ index.html.erb
<% if @over_ten %>
<%= link_to 'Show Previous', "?m=all" %>
<% end %>
<div class="ui segment">
<% @messages.each do |message| %>
<% if message.body %>
<% user = User.find(message.user_id) %>
<div class="item">
<div class="content">
<div class="header"><strong><div class="imageavatarmessage"><%= image_tag user.avatar(:thumb), class:"imageavatarmessage" %></div><%= user.prenom %></strong> <%= message.message_time %></div>
<div class="list">
<div class="item">
<i class="right triangle icon"></i>
<%= message.body %>
</div>
</div>
</div>
</div>
<% end %>
<% end %>
</div>
<%= form_for [@conversation, @message], html: {class: "ui reply form"} do |f| %>
<div class=”field”>
<%= f.text_area :body, class: "form-control" %>
</div>
<%= f.text_field :user_id, value: current_user.id, type: "hidden" %>
<div>
<%= f.submit "Add Reply", class: "ui blue labeled submit icon button" %>
</div>
<% end %>
答案 0 :(得分：1)
我建议你通过本教程来构建一个不错的通知系统 https://www.devwalks.com/lets-build-instagram-part-6-notifications/
基本上，您必须创建新模型，使用Message模型设置依赖关系并集成到控制器
对于电子邮件通知，它甚至更简单。
只需创建新的邮件程序，然后在messages_controller
def create
@message = @conversation.messages.new(message_params)
if @message.save
SendMessageMailer.new_message(@message).deliver_later
redirect_to conversation_messages_path(@conversation)
end
end
修改 要创建邮件程序，您应该执行以下操作：
rails g mailer SendMessage
转到/app/mailers/send_message_mailer.rb并添加操作，与控制器相同类型的建筑物
def new_message(message)
@message = message
mail(to: @message.user.email, subject: 'Hey! Here is what you missed')
end
另外，创建一个视图（电子邮件模板）和带有erb代码的代码
app/views/send_message_mailer/new_message.html.erb
我不会深入研究这个问题，我想你可以弄明白如何通过间隔（如果用户在线或已经阅读过该消息，请说不要发送）并区分接收者/发送者用户
再一次，梅勒就是同一类型的控制器。您可以根据需要传递尽可能多的参数，并在邮件程序控制器和视图中使用模型嵌套邮件收发器
def new_message(message, sender, receiver)
end
控制器
SendMessageMailer.new_message(@message, @message.user, params[:receiver]).deliver_later