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copied!<p>Your question is not clear. By "models" you mean database-backed models that use ActiveRecord, right? </p> <p>Usually validation is not a "file" but is a series of statements within the model's file. Same for relationship declarations.</p> <p>You can split a model's contents amongst any number of files. The technique varies depending on whether you want the other files to contain instance methods or class methods. </p> <p>Easiest is to have instance methods in other files. Eg</p> <pre><code># file foo.rb class Foo < ActiveRecord::Base include FooMethods # --- callbacks --- # before_create :record_signup # "before_create" is a "callback". # See http://api.rubyonrails.org/classes/ActiveRecord/Callbacks.html # note that the method could also be from a different class altogether: before_save EncryptionWrapper.new # See section "Types of callbacks" in the api url referred to above # --- relationships --- # belongs_to :foobar has_many :bars # --- Class Methods --- # def Foo.a_method_name(id) ... end end ~~~~~~~~~~~~~~~~~~~~~~~~~~~ # file foo_methods.rb module FooMethods def method1 ... end def method2 ... end private def record_signup # define the callback method self.signed_up_on = Date.today end end </code></pre> <p>Offhand, I don't how to put the callback override </p> <blockquote> <p>before_create</p> </blockquote> <p>in a different file than the model's main class file. Wouldn't be hard to figure out. But no matter how easy it would be to put in a different file, I would not recommend it from the code clarity point of view.</p>

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