问题
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?
回答1:
Chances are you have something like this:
<%= form_for @product do |f| %>
Because f is already tied to product, you don't need to include it as your first argument, so it should just be:
<%= f.collection_select :category_id, Category.all, :id, :name %>
Or, you could not use f.:
<%= collection_select :product, :category_id, Category.all, :id, :name %>
来源：https://stackoverflow.com/questions/8147069/collection-select-method-gives-error-in-rails-3-1-1