There are various expressions in redmine's Plugin Tutorial, but I personally think that find () should be used only for id.

Why can i do it?

Because it is overridden in the Redmine code as follows.

app/models/project.rb

  def self.find(*args)
    if args.first && args.first.is_a?(String) && !args.first.match(/^\d*$/)
      project = find_by_identifier(*args)
      raise ActiveRecord::RecordNotFound, "Couldn't find Project with identifier=#{args.first}" if project.nil?
      project
    else
      super
    end
  end

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