sonic-pi

Object#with_options

An elegant way to factor duplication out of options passed to a series of
method calls. Each method called in the block, with the block variable as
the receiver, will have its options merged with the default +options+ hash
provided. Each method called on the block variable must take an options
hash as its final argument.

Without <tt>with_options></tt>, this code contains duplication:

  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

Using <tt>with_options</tt>, we can remove the duplication:

  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

It can also be used with an explicit receiver:

  I18n.with_options locale: user.locale, scope: 'newsletter' do |i18n|
    subject i18n.t :subject
    body    i18n.t :body, user_name: user.name
  end

<tt>with_options</tt> can also be nested since the call is forwarded to its receiver.
Each nesting level will merge inherited defaults in addition to their own.

Source | Google | Stack overflow