在Rails中访问表单参数

Question

I have a form with hidden field:

 <%= f.hidden_field(:equipment_id, :value => " ") %> 

The value for this field is submitted via js. So that my generated html looks like this:

 <input value="2" type="hidden" name="programm[equipment_id]" id="programm_equipment_id"> 

When i submit my form my parameters look like this:

 "programm"=>{ .. some other params .., "equipment_id"=>"2" } 

In my controller's create method I try to assign equipment_id parameter to @programm.equipment_id:

 @programm.equipment_id = params[:programm => :equipment_id ] 

like that. Where equipment_id is an integer column in database. The problem is that nothing gets assigned. If i try to cast .to_i "0" is being assigned and stored in database. I also tried to do:

 @programm.equipment_id = params[:equipment_id ] 

But the problem is the same.

Answer 1

The params are nested. You can access it like this:

@programm.equipment_id = params[:programm][:equipment_id]

Answer 2

这应该可以解决问题：

@programm.equipment_id = params[:programm][:equipment_id]

Answer 3

for the view like this:-

<%= form_for(@programm) do |f|%>
  <%= f.hidden_field(:equipment_id, :value => " ") %>
<%end%>

Upon form submission the value entered by the user will be stored in params[:programm][:equipment_id] and can be used to access the value.