Module: ValidationScopes::ClassMethods

Defined in:
lib/validation_scopes.rb

Instance Method Summary collapse

Instance Method Details

#validation_scope(scope) ⇒ Object 



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# File 'lib/validation_scopes.rb', line 10

def validation_scope(scope)
  base_class = self
  deferred_proxy_class_declaration = Proc.new do
    proxy_class = Class.new(DelegateClass(base_class)) do
      include ActiveRecord::Validations

      def initialize(record)
        @base_record = record
        super(record)
      end

      # Hack since DelegateClass doesn't seem to be making AR::Base class methods available.
      def errors
        @errors ||= ActiveRecord::Errors.new(@base_record)
      end
    end

    yield proxy_class

    proxy_class
  end

  define_method(scope) do
    send("validation_scope_proxy_for_#{scope}").errors
  end

  define_method("no_#{scope}?") do
    send("validation_scope_proxy_for_#{scope}").valid?
  end

  define_method("has_#{scope}?") do
    send("validation_scope_proxy_for_#{scope}").invalid?
  end

  define_method("init_validation_scope_for_#{scope}") do
    unless instance_variable_defined?("@#{scope}")
      klass = deferred_proxy_class_declaration.call
      instance_variable_set("@#{scope}", klass.new(self))
    end
  end

  define_method("validation_scope_proxy_for_#{scope}") do
    send "init_validation_scope_for_#{scope}"
    instance_variable_get("@#{scope}")
  end
end