I have a Model called Category and other Model Product. They have has_many and belongs_to relation. But code in my view

    <p><%= f.collection_select(:product, :category_id, Category.all, :id, :name)%>

is giving me 

 undefined method `merge' for :name:Symbol

Any clue what is wrong with it?

ruby-on-rails-3 ruby-1.9.2 form-helpers
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