Created
September 26, 2011 09:35
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Create instance-based validation
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require 'rubygems' | |
gem 'activemodel', '3.0.10' | |
require 'active_model' | |
class ChildValidator < ActiveModel::EachValidator | |
def validate_each(object, attribute, child) | |
klass = "#{object.process}_child_validator".camelize.constantize rescue nil | |
child.validates_with klass unless klass.nil? | |
unless child.errors.empty? | |
object.errors[attribute] << child.errors.full_messages | |
end | |
end | |
end | |
class ClassicChildValidator < ActiveModel::Validator | |
def validate(child) | |
child.validates_presence_of :city | |
end | |
end | |
class FvkChildValidator < ActiveModel::Validator | |
def validate(child) | |
child.validates_presence_of :name | |
end | |
end | |
class A | |
include ActiveModel::Validations | |
attr_accessor :child, :process | |
def initialize | |
@process = 'classic' | |
end | |
validates :child, :child=>true | |
validates_inclusion_of :process, :in=>%w{classic fvk fdb} | |
end | |
class ChildOfA | |
include ActiveModel::Validations | |
attr_accessor :name, :city | |
end | |
a = A.new.tap{ |a| a.process = 'classic' } | |
a.child = ChildOfA.new.tap { |c| c.name = "Hubi" } | |
puts a.valid? ? "Valid" : a.errors.full_messages.join(', ') | |
b = A.new.tap{ |a| a.process = 'fvk' } | |
b.child = ChildOfA.new.tap { |c| c.city = "Aachen" } | |
puts b.valid? ? "Valid" : b.errors.full_messages.join(', ') | |
c = A.new.tap{ |a| a.process = 'invalid_process' } | |
c.child = ChildOfA.new | |
puts c.valid? ? "Valid" : c.errors.full_messages.join(', ') |
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