Module: SuperMappedAttr::ClassMethods

Defined in:
lib/super_mapped_attr.rb

Instance Method Summary collapse

Instance Method Details

#super_mapped_attr(attr, map, options = {}) ⇒ Object

Makes the attribute mapped by a SuperMap, eg. class User

super_mapped_attr :kind, SuperMap.new(
  [:member, 1, "Casual member", { :min_age => 18.years, :welcome_string => "Welcome member!" }],
  [:admin, 2, "Administrator", { :min_age => nil, :welcome_string => "Hello admin!" }]
)

end

u = User.new( :kind => 1 )

u.kind_label # “Casual member”

u.kind_key # :member

u.kind_attr( :member, :min_age ) # 18.years

u.kind_key = :admin

u.kind # 2

User.kinds # #SuperMap:0x.…


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# File 'lib/super_mapped_attr.rb', line 32

def super_mapped_attr( attr, map, options = {} )

  if respond_to?( :validates_inclusion_of )
    validates_inclusion_of attr, { :in => map.values }.merge( options )
  end

  define_method( "#{attr}_key" ) do
    map.key(send(attr))
  end

  define_method( "#{attr}_key=" ) do |key|
    send( "#{attr}=", map.value( key ))
  end

  define_method( "#{attr}_label" ) do
    map.label(send(attr))
  end

  define_method( "#{attr}_attr" ) do |key|
    map.attribute(send(attr), key)
  end

  (class << self; self; end).instance_eval do
    define_method attr.to_s.pluralize, lambda { map }
  end

end