Rails: form_for with field for Hash

Question

i've got model with:

class Product < ActiveRecord::Base
  attr_accessible :category, :description, :img_url, :name, :price, :quantity, :tags

  serialize :tags, Hash
end

and try to make form for it

<%= form_for @product do |f| %>
    <%= f.label :"tags[:condition]_new", "new" %>
    <%= f.radio_button :"tags[:condition]", "New", checked: true %>
    <%= f.radio_button :"tags[:condition]", "Used" %> 
<% end %>

unfortunately it rails raise

undefined method `tags[:condition]' for #Product:0x007fd26d965810> <%= f.radio_button :"tags[:condition]", "Used" %> <-- ONLY FOR 2ND LINE. first is okey. WHY?!

and I can't figure out why its trying to put method on it. Has anyone idea how to make proper field for hash value? + Why it fails only on 2nd f.radio_button and i passes first one?

Kuldeep · Accepted Answer · 2013-07-12 03:43:20Z

2

This is because you are not setting any value for 2nd radio button, try this and it will work fine.

<%= f.radio_button :"tags[:condition]", "Used", checked: false %>

As if you will not pass any value, then FormHelper class will call 'name[:condition]' method on @product to get its corresponding value, though there is no method defined in the model it raises exception.

edited Jul 12, 2013 at 3:43

answered Jul 12, 2013 at 3:02

Kuldeep

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