每个如果不是零 - Rails

Question

我有一个具有付费布尔属性的发票模型.帐户和发票之间存在关联,我只想在视图中显示未付款的发票.

我用它来显示所有发票:

<table class="table">
  <thead>
    <tr>
      <th>Invoice Number</th>
      <th>Invoice Date</th>
      <th>Invoice Total</th>
    </tr>
  </thead>

  <tbody>
    <% @account.invoices.each do |invoice| %>
      <tr>
        <td><%= invoice.id%> </td>
        <td><%= invoice.created_at.time.to_formatted_s(:long)%> Zulu </td>
        <td><%= invoice.total %></td>
      </tr>
    <% end %>
  </tbody>

但我不确定如何将结果限制在只paid显示nil的发票的地方.我试过:<% @account.invoices.each do |invoice| unless @account.invoices.paid == 'nil' %>但是遇到了错误.显然我的语法错了.有什么建议？

Answer 1

你可以named scope在这种情况下使用.

unpaid在invoices模型中创建了一个范围:

scope :unpaid, -> { where( paid: [nil, false] ) }

并在视图中使用它,如下所示:

<% @account.invoices.unpaid.each do |invoice| %>