class CommentsController < ApplicationController
   def index
     @comments = Comment.all
     @comments = Comment.joins(:comment_user).where("comment_users.username LIKE ?", "%#{params[:username]}%") if params[:username].present?  
     @total_count = @comments.size
     @comments = @comments.order('created_at desc').page(params[:page]).per(15)
   end

<h2 style='margin: 40px auto 25px 100px;'>
       管理员查看普通用户评论的文章列表
     </h2>
     <div style='margin: auto auto 25px 100px;'>
     <p>评论总数: <%= @total_count %></p>
     <%= paginate @comments %>
     </div>
     <div style='margin-left: 100px;'>
       <%= form_tag comments_path, method: :get do %>                                                 
         用户名: <%= text_field_tag :username, params[:username]%>
         <%= submit_tag "搜索" %>
       <% end %>
     </div>
     <table style='margin: 35px auto 20px 100px;'>
       <tr style='background-color: lightgray;'>
         <td>评论时间:</td>
         <td>评论用户:</td>
         <td>评论文章:</td>
         <td>评论内容:</td>
       </tr>

       <% @comments.each do |comment| %>
         <tr>
           <td><%= comment.created_at.strftime("%Y-%m-%d %I:%M%p")  %></td>
           <td><%= comment.comment_user.try(:username) %></td>
           <% if comment.article %>
             <td><%= link_to comment.article.title, "/articles/#{comment.article_id}" %></td>
           <% else %>
             <td>文章已删除</td>
           <% end %>
           <td><%= comment.content %></td>
         </tr>
       <% end %>
     </table>

   <%= link_to '主页', articles_path, style: 'color: white; text-decoration: none; margin-left: 20px;' %>
   <% if session[:current_user].present? %>
     <%= link_to '查看评论列表', comments_path, style: 'color: white; margin-left: 20px; text-decoration: none;' %>
   <% end %>