From: Greg Ma <gregorylepacha@...>
Date: 2010-02-15T05:37:13+09:00
Subject: Mon proprety isn't a string?

Hi,
I would simply like to remove spaces of the property "name" before save
and update.
So i did the code below, but i get this error when I save or update a
tag.
#error
undefined method `strip' for nil:NilClass



#Tag class
class Tag < ActiveRecord::Base
  has_and_belongs_to_many :students

  attr_accessible :name

  validates_uniqueness_of :name

  before_save :remove_spaces
  before_update :remove_spaces

  private
  def remove_spaces
    name = name.strip
  end

end



This is how i save or update my tag
#From another class
  def tag_attributes=(tags_att)
    splits = tags_att.split(',')
    splits.each do |tag|
      if !tags.find_by_name(tag)
        tags.build(:name => tag)
      end
    end
  end
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