Module: ClassAttributes

Extended by:
ClassAttributes
Included in:
ClassAttributes
Defined in:
lib/common/class_attributes.rb

Overview

User.current = User.first

Constant Summary collapse

CA_DEFAULTS = 
{}

Instance Method Summary collapse

Instance Method Details

#define(klass, name, default = nil, &block) ⇒ Object

defines class variable

Raises:

  • (ArgumentError) 


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# File 'lib/common/class_attributes.rb', line 31

def define klass, name, default=nil, &block
  raise ArgumentError, 'name must be symbol' unless name.class == Symbol

  default ||= block if block

  ::ClassAttributes::CA_DEFAULTS[name] = { 'Object'=>default }

  klass.define_singleton_method('%s=' % name) { |*args| send name, *args}
  klass.define_singleton_method(name) do |*args|
    root = ::ClassAttributes::CA_DEFAULTS[name]

    # set and return if argument defined
    return root[to_s] = args[0] if args.length > 0

    # find value and return
    ancestors.map(&:to_s).each do |el|
      value = root[el]
      if value || el == 'Object'
        value = instance_exec(&value) if value.is_a?(Proc)
        return value
      end
    end
  end
end