Working With Rails

No Peeping Toms

This plugin disables observers in your specs, so that model specs can run in complete isolation.

You can choose to run some code with observers turned on. This is useful when spec’ing an observer. For example, if you write the following observer:

class PersonObserver < ActiveRecord::Observer
  def before_update(person)
    old_person = Person.find person.id
    if old_person.name != person.name
      NameChange.create! :person => person, :old_name => old_person.name, :new_name => person.name
    end
  end
end

You can spec the Person class in complete isolation.

describe Person, " when changing a name" do
  before(:each) do
    @person = Person.create! :name => "Pat Maddox" 
  end
end

1. By default, don’t run any observers it “should not register a name change” do lambda { @person.update_attribute :name, “Don Juan Demarco” }.should_not change(NameChange, :count) end

1. Run only a portion of code with certain observers turned on it “should register a name change with the person observer turned on” do Person.with_observers(:person_observer) do lambda { @person.update_attribute :name, “Don Juan Demarco” }.should change(NameChange, :count).by(1) end

   lambda { @person.update_attribute :name, “Man Without a Name” }.should_not change(NameChange, :count)

   end

Copyright© 2007 Pat Maddox, released under the MIT license

NOTE: This description has been extracted from the Plugin README and so the formatting may need updating to make browser friendly