Good notes posted by insane-dreamer

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July 23, 2010
3 thanks

Moved in Rails 3

In Rails 3, this has moved to ActionDispatch::TestProcess

(Which means, if you want to use it in a test, you need to add the following to test_helper.rb:)

include ActionDispatch::TestProcess
March 21, 2009
4 thanks

Passing optional arguments with defaults to a named_scope

An easy way to do this. (This also shows how you can use joins in a named_scope as well.)

Class User << ActiveRecord::Base
belongs_to :semester 

named_scope :year, lambda { |*year|
  if year.empty? || year.first.nil?
    { :joins => :semester, :conditions => ["year = #{CURRENT_SEMESTER}"]}
    { :joins => :semester, :conditions => ["year = #{year}"]}


You can then call:

User.year     # defaults to CURRENT_SEMESTER constant
User.year()  # same as above
User.year(nil)  # same as above; useful if passing a param value that may or may not exist, ie, param[:year]