before_save :strip_strings
validates_uniqueness_of :username validates_presence_of :username private def strip_strings self.username = username.gsub!(" ","") end
example:
username = " gissmoh@gissmoh.de "
becomes gissmoh@gissmoh.de and is stored in the datbase as gissmoh@gissmoh.de
"gissmoh @gissmoh. de"
becomes gissmoh@gissmoh.de and is stored in the datbase as gissmoh@gissmoh.de
So I have duplicate entries!!