anchor.diff:    <div class="card-header">
       <h4 class="card-title"><%= I18n.t('.prizes.title') %></h4>
     </div>
  -  <div class="card-body">
  +  <div class="card-body" id="prizes">
       <form method="post" action="/groups/<%= group.id %>/prizes" id="prize-form">
         <input type="hidden" name="_method" value="PUT">
  -      <table class="table" id="prizes">
  +      <table class="table">
           <tr v-for="(prize, index) in prizes">
             <td class="prize-edit-cell">
               <input type="text" class="form-control" v-model="prize['name']" name="prizes[]">
  
positive.code:         </tr>
          <tr>
            <td class="prize-edit-cell">
              <input type="text" class="form-control" v-model="newItem">
            </td>
            <td class="text-right prize-actions-cell">
              <a href="#" class="btn-link btn-info" @click.stop="add">
  
negative.code:           this.$set(this.prizes, key+1, this.prizes[key])
            this.$set(this.prizes, key, temp)
          }
        }
      })
    </script>
  