如何设置表标签中的视图限制？

Question

这是我的视图文件的代码，它显示了表的多个列。

限制正在进行，但列数是多个。

    

<table class="table table-responsive">
    <tr>
        <th>Title</th>
        <th>Description</th>

    <% obj.each do |article| %>
        <% if logged_in? && current_user == article.user %>
            <th>Edit</th>
            <th>Show</th>
            <th>Delete</th>
            <th>Created By</th>
            <th>Created At</th>
            <th>Updated At</th>
        <% end %>

    <% end %>
    </tr>


    <% obj.each do |article| %>
    <tr>
    <td><%= article.title %></td>
    <td><%= article.description %></td>
    <% if logged_in? && current_user == article.user %>

        <td><%= link_to "Edit", edit_article_path(article), class: "btn btn-primary" %> </td>
        <td><%= link_to "show", article_path(article), class: "btn btn-success" %></td>
        <td><%= link_to "Delete", article_path(article), method: :delete, data: {confirm: "Are you Sure?"}, class: "btn btn-danger" %></td>

        <td> <%= article.user.username if article.user %> </td>
        <td> <%= time_ago_in_words(article.created_at) %> ago.</td>
        <td> <%= time_ago_in_words(article.updated_at) %> ago.</td>
        </tr>
    <% end %>

    <% end %>
</table>

<%= link_to 'Back', root_path, class: "btn btn-primary btn-lg" %>

Answer 1

根据thead的值打印obj，尝试只留下第二次迭代，打印每个tr，可能是这样的：

<% if logged_in? && current_user == article.user %>
  <tr>
    <th>Edit</th>
    <th>Show</th>
    <th>Delete</th>
    <th>Created By</th>
    <th>Created At</th>
    <th>Updated At</th>
  </tr>

  <tbody>
    <% obj.each do |article| %>
      <tr>
        <td><%= article.title %></td>
        <td><%= article.description %></td>
        <% if logged_in? && current_user == article.user %>
          <td><%= link_to "Edit", edit_article_path(article), class: "btn btn-primary" %> </td>
          <td><%= link_to "show", article_path(article), class: "btn btn-success" %></td>
          <td><%= link_to "Delete", article_path(article), method: :delete, data: {confirm: "Are you Sure?"}, class: "btn btn-danger" %></td>
          <td> <%= article.user.username if article.user %> </td>
          <td> <%= time_ago_in_words(article.created_at) %> ago.</td>
          <td> <%= time_ago_in_words(article.updated_at) %> ago.</td>
        <% end %>
      </tr>
    <% end %>
  </tbody>
<% end %>

Answer 2

我对您的标题问题的理​​解是，您希望阻止查看所有表格。所以

<% if logged_in? && current_user == article.user %>
   <table class="table table-responsive">
      <tr>
         ...
         the rest of the code for show the table
         ....
   </table>
<% end %>

这将隐藏整个表的视图，它只会显示给文章作者

Answer 3

问题是，您正在迭代article中的每个obj，并在每个时间输出标题当前登录用户是文章用户：

<% obj.each do |article| %>
    <% if logged_in? && current_user == article.user %>
        <th>Edit</th>
        <th>Show</th>
        <th>Delete</th>
        <th>Created By</th>
        <th>Created At</th>
        <th>Updated At</th>
    <% end %>
<% end %>

如果用户已登录并且是任何 article的用户，您可能只想显示一次标题，Ruby有一个方法，{{3} }。所以这样的事情应该是你正在寻找的东西：

<% if logged_in? && obj.any? { |article| current_user == article.user } %>
  <th>Edit</th>
  <th>Show</th>
  <th>Delete</th>
  <th>Created By</th>
  <th>Created At</th>
  <th>Updated At</th>
<% end %>

如果用户已登录并且是页面上任何文章的作者，则应该只输出一组标题，而不是每篇文章创作的一组标题。