Rails hidden field undefined method 'merge' error

Question

I wanna do something like this in rails

Here is what I have so far in rails:

<%= form_for @order do |f| %>
  <%= f.hidden_field :service,          


        

Answer 1

You are using a hidden_field instead of a hidden_field_tag. Because you are using the non-_tag version, it is assumed that your controller has already set the value for that attribute on the object that backs the form. For example:

controller:

def new
  ...
  @order.service = "test"
  ...
end

view:

<%= form_for @order do |f| %>
  <%= f.hidden_field :service %>
  <%= f.submit %>
<% end %>