Contents

require 'glue/validation'

module Glue 

# Extend the Validation methods defined in glue/validation.rb with 
# extra db related options.

module Validation

  # Encapsulates a list of validation errors.
  
  class Errors
    cattr_accessor :not_unique, 'The value is already used'
    cattr_accessor :invalid_relation, 'Invalid relations'
  end

  module MetaLanguage 

    # Validate the value of this attribute is unique
    # for this class.
    #
    # The Og libraries are required for this methdod to 
    # work. You can override this method if you want to
    # use another OR mapping library.
    #
    #--
    # TODO: :unique should implicitly generate 
    # validate_unique.
    #++

    def validate_unique(*params)
      c = { 
        :msg => Glue::Validation::Errors.not_unique, 
        :on => :save 
      }
      c.update(params.pop) if params.last.is_a?(Hash)

      for name in params
        # FIXME: improve the generated code.
        code = %{
          others = obj.class.find_by_#{name}(obj.#{name})
          unless (others.is_a?(Array) and others.empty?)
            errors.add(:#{name}, '#{c[:msg]}')
          end;
        }

        __meta[:validations] << [code, c[:on]]
      end
    end

    # Validate the related object or objects. Works
    # with all relations.
    
    def validate_related(*params)
      c = { 
        :msg => Glue::Validation::Errors.invalid_relation, 
        :on => :save 
      }
      c.update(params.pop) if params.last.is_a?(Hash)
      
      for name in params
        code = %{
          unless (obj.#{name}.is_a?(Array) ? obj.#{name} : [obj.#{name}]).inject(true) { |memo, obj| (obj.nil? or obj.valid?) and memo }
            errors.add(:#{name}, '#{c[:msg]}')
          end;
        }

        __meta[:validations] << [code, c[:on]]
      end
    end
    alias_method :validate_associated, :validate_related

  end
  
end 

end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
og-0.21.0	lib/og/validation.rb
og-0.21.2	lib/og/validation.rb
og-0.22.0	lib/og/validation.rb
og-0.23.0	lib/og/validation.rb