Rails: Undefined method `truncate' in model

In rails include:

 include ActionView::Helpers::TextHelper

but if you want to tested in Ruby irb:

 require 'action_view'
 include ActionView::Helpers::TextHelper

You're using it wrong, you should be calling this method on a String. See truncate's signature.

Use:

if description.length > nb_words_max
  description.truncate(nb_words_max, :separator => ' ') + " ..."
else
  ...

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