如何设置 Rails 站点的通知系统
创建 Model 及 Controller
- 在 Terminal 当中执行：
$ rails g model announcement message:text starts_at:datetime ends_at:datetime$ rails g controller announcements$ rails g controller admin::announcements$ rake db:migrate
- 设定 announcement
# app/models/announcement.rb
def self.current(hidden_ids = nil)
result = where("starts_at <= :now and ends_at >= :now", now: Time.zone.now)
result = result.where("id not in (?)", hidden_ids) if hidden_ids.present?
result
end
Application.html.erb
views/layouts/application.html.erb
<% Announcement.current(cookies.signed[:hidden_announcement_ids]).each do |announcement| %>
<div class="alert alert-dismissable alert-success announcement" id="announcement_<%= announcement.id %>">
<%= announcement.message %>
<%= link_to "不再提醒", hidden_announcement_path(announcement), remote: true %>
</div>
<% end %>
<!-- 在此行上面添加 -->
<%= render "common/flashes" %>
- 设置 css
.announcement {
text-align: center;
a {
float: right;
color: #980905;
}
}
Controller
- 管理员通知管理
# app/controllers/admin/announcements_controller.rb
class Admin::AnnouncementsController < ApplicationController
before_action :authenticate_user!
before_action :admin_required
before_action :find_announcement, only: [:edit, :update, :destroy]
def index
@announcements = Announcement.all
end
def new
@announcement = Announcement.new
end
def create
@announcement = Announcement.new(announcement_params)
if @announcement.save
redirect_to admin_announcements_path, notice: "Announcement Created Succeed."
else
render :new
end
end
def edit
end
def update
if @announcement.update(announcement_params)
redirect_to admin_announcements_path, notice: "Announcement Updated Succeed."
else
render :edit
end
end
def destroy
@announcement.destroy
redirect_to admin_announcements_path
end
private
def announcement_params
params.require(:announcement).permit(:message, :starts_at, :ends_at)
end
def find_announcement
@announcement = Announcement.find(params[:id])
end
end
- 用户通知管理
# app/controllers/announcements_controller.rb
def hide
ids = [params[:id], *cookies.signed[:hidden_announcement_ids]]
cookies.permanent.signed[:hidden_announcement_ids] = ids
respond_to do |format|
format.html { redirect_to :back }
format.js
end
end
路由设定
get '/announcements/:id/hide', to: 'announcements#hide', as: 'hidden_announcement'
用户选择 hide 后的处理
// app/views/announcements/hide.js.erb
$("#announcement_<%= j params[:id] %>").remove();