Module: ActiveTools::ActiveRecord::WithPermalink::ClassMethods

Defined in:
lib/active_tools/active_record/with_permalink.rb

Instance Method Summary collapse

Instance Method Details



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# File 'lib/active_tools/active_record/with_permalink.rb', line 7

def with_permalink(*args)
  options = args.extract_options!
  unless (column_name = args.first.to_sym) || options[:from].present?
    raise "WithPermalink: column_name and/or options[:from] expected!"
  end

  options[:uniq] ||= true

  cattr_accessor :with_permalink_options unless defined?(with_permalink_options)
  self.with_permalink_options ||= {}
  self.with_permalink_options[column_name] = options

  validates_presence_of column_name
  validates_uniqueness_of column_name, options[:scope] ? {:scope => Array(options[:scope])} : {}

  before_validation do
    self.with_permalink_options.each do |column_name, options|
      eval <<-EOV
        source = @_#{column_name}_demanded
      EOV
      source ||= case options[:from]
      when String, Symbol then send(options[:from])
      when Proc then options[:from].call(self)
      end
      if options[:uniq]
        self.send("#{column_name}=", generate_permalink(column_name, source, options))
      else
        self.send("#{column_name}=", source)
      end
    end
  end

  after_save do
    instance_variable_set(:"@_#{column_name}_demanded", nil)
  end

  class_eval <<-EOV
    def #{column_name}=(value)
      @_#{column_name}_demanded = value if value.present?
      super(value)
    end

    def to_param
      changes["#{column_name}"].try(:first)||#{column_name}
    end        
  EOV

end