Class: QuickClass

Inherits:
Object
  • Object
show all
Defined in:
lib/quick_class.rb

Overview

a quick and easy class factory

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ QuickClass

configure attributes from #initialize. note that defaults are not set here. Use .default for that.



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# File 'lib/quick_class.rb', line 19

def initialize(opts={})
  opts.each { |k,v| instance_variable_set("@#{k}", v) }
end

Class Method Details

.attributes ⇒ Object

read default attributes



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# File 'lib/quick_class.rb', line 16

def self.attributes; @attributes; end

.attributes=(**keyvals) ⇒ Object

main public method - define attributes for a class



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# File 'lib/quick_class.rb', line 4

def self.attributes=(**keyvals)
  # if attributes is already defined, delete the attr_accessor methods
  @attributes&.each_key { |k| [:"#{k}", :"#{k}="].each &method(:undef_method) }
  # define attributes at the keyvals passed to this method as an argument,
  # merged with the attributes of the superclass, if there is one.
  @attributes = keyvals.merge(superclass&.attributes || {})
  # define public attr_accessor methods for all the attributes
  attr_accessor *@attributes.keys
  # define a .default method that invokes #initialize with .attributes
  define_singleton_method(:default) { new @attributes }
end