Class: Maintain::Backend::ActiveRecord

Inherits:
Base
  • Object
show all
Defined in:
lib/maintain/backend/active_record.rb

Instance Attribute Summary

Attributes inherited from Base

#maintainer

Instance Method Summary collapse

Instance Method Details

#aggregate(maintainee, name, attribute, states, options = {}) ⇒ Object 



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# File 'lib/maintain/backend/active_record.rb', line 4

def aggregate(maintainee, name, attribute, states, options = {})
  # named_scope will handle the array of states as "IN" in SQL
  state(maintainee, name, attribute, states, options.merge(:dirty => false))
end

#on(maintainee, attribute, event, state, method, options) ⇒ Object 



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# File 'lib/maintain/backend/active_record.rb', line 9

def on(maintainee, attribute, event, state, method, options)
  attribute_check = "#{attribute}#{"_was" if event == :exit}_#{state}?"
  maintainee.before_save method, :if => lambda {|instance|
    if instance.send("#{attribute}_changed?") && instance.send(attribute_check)
      if options[:if]
        if options[:if].is_a?(Proc)
          instance.instance_eval(&options[:if])
        else
          instance.send(options[:if])
        end
      elsif options[:unless]
        if options[:unless].is_a?(Proc)
          !instance.instance_eval(&options[:unless])
        else
          !instance.send(options[:unless])
        end
      else
        true
      end
    else
      false
    end
  }
end

#read(instance, attribute) ⇒ Object 



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# File 'lib/maintain/backend/active_record.rb', line 34

def read(instance, attribute)
  instance.read_attribute(attribute)
end

#state(maintainee, name, attribute, value, options = {}) ⇒ Object 



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# File 'lib/maintain/backend/active_record.rb', line 38

def state(maintainee, name, attribute, value, options = {})
  options = {:dirty => true}.merge(options)
  conditions = {:conditions => {attribute => value}}
  named_scope_method = defined?(::ActiveRecord::VERSION) && ::ActiveRecord::VERSION::STRING >= '3' ? :scope : :named_scope
  maintainee.send(named_scope_method, name, conditions) if !maintainee.respond_to?(name) || options[:force]
  maintainee.send(named_scope_method, "#{attribute}_#{name}", conditions)
  if options[:dirty]
    maintainee.class_eval <<-dirty_tracker
      def #{attribute}_was_#{name}?
        #{attribute}_was == self.class.maintainers[:#{attribute}].value(self).value_for(:#{name})
      end
    dirty_tracker
  end
end

#write(instance, attribute, value) ⇒ Object 



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# File 'lib/maintain/backend/active_record.rb', line 53

def write(instance, attribute, value)
  instance.send(:write_attribute, attribute, value)
end