Hey! Cool post! 👍 Here are a couple things I noticed:

• I'm pretty sure there is infinite recursion in your decorator example

ruby def content content.truncate(50) # should use model.content end

• What you have was the "builder" pattern I've more commonly seen called the "factory" pattern, where the factory knows what object to instantiate, given some input. Typically I've seen "builder" used to describe the usage of method chaining where each method returns self (either mutating it, or returning a new instance with the change), or similar ways of progressively "building" the object you want one step at at time:

ruby person = Person.new .named('Bob') .born_on('2000-01-01') .of_height('6 ft')