はじめ

FontAweSomeで削除アイコンを導入

qiita.rb

  
<head>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
</head>

xxx.html.erb

  <i class="fa fa-trash-o fa-lg" aria-hidden="true"></i>

Destroy一例

photos_controller.rb

  def destroy
    @photo = Photo.find(params[:id])
    room = @photo.room

    @photo.destroy
    @photos = Photo.where(room_id: room.id)

    respond_to :js

respond_to :jsのファイル

photos/destroy.js.erb

$('#photos').html("<%= j render 'photos_list' %>")