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copied!<p>I have got a working stand-alone adaptation of your code (see below). I had to make three small changes to get it working the way you were expecting.</p> <p>To get the Observer working at all you have to instantiate it. In my example I needed to add the lines:</p> <pre><code>Mongoid.observers = CommentBadgeObserver Mongoid.instantiate_observers </code></pre> <p>In Rails you can achieve the same thing adding this to config/application.rb (according to the <a href="http://mongoid.org/docs/callbacks/observers.html" rel="noreferrer">docs</a>):</p> <pre><code>config.mongoid.observers = :comment_badge_observer </code></pre> <p>I think there is also a small logic error in <code>CommentBadge.check_conditions_for</code>, the <code>> 1</code> should be <code>> 0</code>. </p> <p>Finally I changed the <code>User#award</code> method to save the badge rather than the user, because the 'foreign key' field that stores the relationship is on the badge side.</p> <pre><code>class Comment include Mongoid::Document field :name belongs_to :user end class CommentBadgeObserver < Mongoid::Observer observe :comment def after_create(comment) CommentBadge.check_conditions_for(comment.user) end end class Badge include Mongoid::Document field :title belongs_to :user end class CommentBadge < Badge def self.check_conditions_for(user) if user.comments.size > 0 badge = CommentBadge.create!(:title => "Comment badge") user.award(badge) end end end class User include Mongoid::Document field :first_name has_many :comments has_many :badges def award(badge) self.badges << badge badge.save! end end Factory.define(:user) do |u| u.first_name 'Bob' end Factory.define(:comment) do |c| c.name 'Some comment...' end # Observers need to be instantiated Mongoid.observers = CommentBadgeObserver Mongoid.instantiate_observers describe CommentBadgeObserver do it 'should create badges' do @user = Factory.build(:user) @comment = Factory(:comment, :user => @user) @user.badges.count.should == 1 @user.badges[0].title.should == "Comment badge" end end </code></pre>

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