视图中的条件显示

Question

在我的 index.html.erb 上，我想根据记录的值显示两个内容之一。

我的拆分有一个名为“默认”的列，如果该列的内容 = 1，那么我想显示一个挂锁图标，指示用户无法更改该项目。如果该值是其他值，我想显示一个复选框。

在我的拆分控制器中，我创建了“@default”：

def index
    @splits = Split.all
    @chosen_splits = Issue.find(1).splits.order('updated_at desc')
    @split = Split.first
    @default = Split.find_by default: "1"
    # @balance = @split.balance
end

在我看来，我有以下代码：

<% @chosen_splits.each do |split| %>

<tr>
  <td> <!-- trying to have conditional presentation -->
    <% if @default == '1' %>
    <i class="fa fa-2x fa-lock"></i>
    <% else %>
    <input type="checkbox" value>
    <% end %>
  </td> <!-- end of trying to have conditional presentation -->
  <td><%= link_to split.name, split_path(split) %></td>
  <td class="text-right"><%= number_with_delimiter(split.quantity) %></td>
  <td><%= link_to 'Edit', edit_split_path(split), :class => 'btn btn-xs btn-default' %></td>
  <td><%= link_to 'Delete', split, method: :delete, data: { confirm: 'Are you sure?'}, :class => 'btn btn-xs btn-danger' %></td>
</tr>
<% end %>

从我看到的here 来看，这应该可以工作。但是，事实并非如此。

我的日志文件正在显示：

Processing by SplitsController#index as HTML
  [1m[35mIssue Load (0.4ms)[0m  SELECT  "issues".* FROM "issues" WHERE "issues"."id" = $1 LIMIT 1  [["id", 1]]
  [1m[36mSplit Load (0.3ms)[0m  [1mSELECT  "splits".* FROM "splits"  ORDER BY "splits"."id" ASC LIMIT 1[0m
  [1m[35mSplit Load (0.2ms)[0m  SELECT  "splits".* FROM "splits" WHERE "splits"."default" = $1 LIMIT 1  [["default", 1]]
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT  "issues".* FROM "issues" WHERE "issues"."id" = $1 LIMIT 1[0m  [["id", 1]]
  [1m[35m (0.3ms)[0m  SELECT SUM("splits"."quantity") FROM "splits"
  [1m[36mCACHE (0.0ms)[0m  [1mSELECT SUM("splits"."quantity") FROM "splits"[0m
  [1m[35mSplit Load (0.2ms)[0m  SELECT "splits".* FROM "splits"
  [1m[36mSplit Load (0.3ms)[0m  [1mSELECT "splits".* FROM "splits" WHERE "splits"."issue_id" = $1  ORDER BY updated_at desc[0m  [["issue_id", 1]]
  Rendered splits/index.html.erb within layouts/application (7.5ms)
Completed 200 OK in 625ms (Views: 620.9ms | ActiveRecord: 1.6ms)

非常感谢所有帮助。

Answer 1

@default 不包含带有“1”的字符串，它包含一个Split 对象，即default 列包含“1”的对象。

或者，如果找不到该对象，则它包含nil。

也许你想做的事情最好用...来完成

<% @chosen_splits.each do |split| %>
    <tr>
      <td> <!-- trying to have conditional presentation -->
        <% if split.default == '1' %>
          <i class="fa fa-2x fa-lock"></i>
        <% else %>
          <input type="checkbox" value>
        <% end %>