delegate - khanhld

Delegatein Ruby on Rails

● Delegate● Options● Demo

Delegate

● Easily expose contained objects’ public methods as your own.

● Useful with ActiveRecord associations● delegate :method_name, to: :target

Delegate

● Multiple delegates to the same target are allowed

● delegate :method1, :method2, to: :target● Methods can be delegated to instance

variables, class variables, or constants

Delegate

● Delegate a method to the class by using :class

● delegate :hello, to: :class

Options

● :allow_nil● If the target is nil and does not respond to

the delegated method a NoMethodError is raised

● delegate :name, to: :profile, allow_nil: true● Returns nil

Options

● delegate :name, to: :profile, prefix: true● Delegate methods are prefixed with the

name of the object being delegated to.● delegate :name, to: :client, prefix: :customer● Supply a custom prefix

Thank you

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