Rails3 form_for hidden_field undefined method ‘merge’

capybara-webkitcucumberruby-on-rails-3

My attempt to place a hidden_field within a form_for is crashing within cucumber on an ActionView helper error. Something also about FixNum which escapes me since I haven't dug through the source code. My prices_controller shows this:

 @price = Price.new
  @commodity = Commodity.find(params[:id])

I want to make the link between price and commodity with this hidden_field:

 <%= form_for (@price), :url => prices_path  do |f| %>
  <% f.hidden_field :commodity_id, @commodity.id %>
 .
 .
 <div class="actions">
 <%= f.submit "Submit" %>
   </div>

Looked at the form_for api and the above should work. Reading other replies on stackoveflow, I have put the hidden_field in its own div within the form, added a Hidden_field_tag, and placed it within the actions div before the submit line. Looking at the merge msg, I guess it doesn't like something about the line, but it appears OK to me. The commodity_id field is the match field, sam

Best Answer

If you could paste the error message itself, and the relevant lines of the trace, it could help us. Right now, the only thing I see is that the ERB tag before f.hidden_field should be <%=, and I'm not sure about it since I don't use ERB. For what it's worth, merge is usually used with Hash objects. Maybe it can point you in the right direction

EDIT Ok I get it. You have to write f.hidden_field :commodity_id, :value => @commodity.id.

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