http://api.rubyonrails.org/

Module
ActiveRecord::Callbacks

Callbacks are hooks into the lifecycle of an Active Record object that 
allow you to trigger logic before or after an alteration of the object 
state. This can be used to make sure that associated and dependent 
objects are deleted when destroy is called (by overwriting 
before_destroy) or to massage attributes before they‘re validated (by 
overwriting before_validation). As an example of the callbacks 
initiated, consider the Base#save call for a new record:

Perhaps an after_save method for your Project class could create a 
default set of Tasks...
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