Did you know you can refactor this:
# Duplicated :dependent => :destroy option.
class Account < ActiveRecord::Base
has_many :customers, :dependent => :destroy
has_many :products, :dependent => :destroy
has_many :invoices, :dependent => :destroy
has_many :expenses, :dependent => :destroy
end
class Account < ActiveRecord::Base
has_many :customers, :dependent => :destroy
has_many :products, :dependent => :destroy
has_many :invoices, :dependent => :destroy
has_many :expenses, :dependent => :destroy
end
into this?
# Nice and DRY!
class Account < ActiveRecord::Base
with_options :dependent => :destroy do |assoc|
assoc.has_many :customers
assoc.has_many :products
assoc.has_many :invoices
assoc.has_many :expenses
end
end
class Account < ActiveRecord::Base
with_options :dependent => :destroy do |assoc|
assoc.has_many :customers
assoc.has_many :products
assoc.has_many :invoices
assoc.has_many :expenses
end
end
The with_options method is a really cool chunk of code that lets you DRY up duplication that sometimes appear when passing the same options to a series of methods.
But the point of this post is how it works behind the scenes, so check out this 11-minute code walkthrough:
By the way, this is an excerpt of a longer screencast I’m working on about ActiveSupport internals. If you’d like to be notified when the full screencast is released, drop your email in this form. (One email, ever.)
You can also check out the other Rails-related screencasts I’ve already done.