collection_select, undefined method `map' for nil:NilClass

Question

I added in the @user = User.new line to make sure it isn\'t nil. Which object is nil?

undefined method `map\' for nil:NilClass

Extracted source         


        

Answer 1

@user_array is nil. Make sure it's set with an array of users to avoid this error message.

Alternatively, set @user_array to [] (an empty array) if you wish to show no options in the `select, e.g.:

collection_select @user, :full_name, @user_array || [], :id, 
  { prompt: 'true' }, { class: 'select' }