如何在 Ruby on Rails 的 form_for 中使用 hidden_field？
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How do I use hidden_field in a form_for in Ruby on Rails?
提问by ben
I've read this, but I'm new to RoR so I'm having a little trouble understanding it. I'm using a form to create a new request record, and all of the variables that I need to send exist already. Here is the data I need to send (this is in a do loop):
我读过这个，但我是 RoR 的新手，所以我在理解它时有点困难。我正在使用一个表单来创建一个新的请求记录，并且我需要发送的所有变量都已经存在。这是我需要发送的数据（这是在执行循环中）：
:user_id => w[:requesteeID]
:requesteeName => current_user.name
:requesteeEmail => current_user.email
:info => e
Here's my form, which works so far, but only send NULL values for everything:
这是我的表单，到目前为止有效，但只为所有内容发送 NULL 值：
<% form_for(:request, :url => requests_path) do |f| %>
<div class="actions">
<%= f.submit e %>
</div>
<% end %>
How do I use hidden_fields to send the data I already have? Thanks for reading.
如何使用 hidden_fields 发送我已有的数据？谢谢阅读。
回答by Salil
Ref hidden_fieldor hidden_field_tag
参考hidden_field或hidden_field_tag
<% form_for(:request, :url => requests_path) do |f| %>
<div class="actions">
<%= f.hidden_field :some_column %>
<%= hidden_field_tag 'selected', 'none' %>
<%= f.submit e %>
</div>
<% end %>
then in controller
然后在控制器中
params[:selected]="none"
params[:request][:some_column] = request.some_column
Note when you used
使用时注意
<%= f.hidden_field :some_column %>
it change to html
它更改为 html
<input type="hidden" id="request_some_column" name="request[some_column]" value="#{@request.some_column}" />
and when you used
当你使用
<%= hidden_field_tag 'selected', 'none' %>
it change to html
它更改为 html
<input id="selected" name="selected" type="hidden" value="none"/>
回答by Bruno Paulino
You can send a custom value as a hidden input for your model like that:
您可以像这样发送自定义值作为模型的隐藏输入：
<%= f.hidden_field :your_model_field_name, value: 12 %>
Where value: 12is just a demo, but you can pass whatever value you need.
Wherevalue: 12只是一个演示，但您可以传递您需要的任何值。
