Module: ActiveRecord::ActsAs::HasEav::InstanceMethods

Defined in:
lib/has_eav.rb

Overview

/ClassMethods

Instance Method Summary collapse

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_symbol, *args, &block) ⇒ Object

override method missing, but only kick in when super fails with a NoMethodError



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# File 'lib/has_eav.rb', line 95

def method_missing method_symbol, *args, &block
  super
rescue NoMethodError => e
  method_name    = method_symbol.to_s
  attribute_name = method_name.gsub(/[\?=]$/, '')

  raise e unless eav_attributes_list.include? attribute_name

  attribute = self.eav_attributes.select { |a|
    a.name == attribute_name
  }.first

  if method_name =~ /\=$/
    value = args[0]

    if attribute
      if value
        return attribute.send(:write_attribute, "value", value)

      elsif value.nil?
        return attribute.destroy

      end

    else
      @eav_attributes << eav_class.new(
        :name  => attribute_name,
        :value => "#{value}"
      )

      return cast_eav_value(value, attribute_name)

    end
  elsif method_name =~ /\?$/
    return ( attribute and attribute.value == true ) ? true : false

  else
    return attribute ?
      cast_eav_value(attribute.value, attribute_name) :
      nil

  end

  raise e
end

Instance Method Details

#changed? ⇒ Boolean

override changed - if any of the eav_attributes has changed, the object has changed.

Returns:

  • (Boolean) 


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# File 'lib/has_eav.rb', line 178

def changed?
  eav_attributes.each do |attribute|
    return true if ( attribute.changed? || attribute.new_record? )
  end

  super
end

#class_eav_attributes ⇒ Object

get the class eav attributes



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# File 'lib/has_eav.rb', line 81

def class_eav_attributes
  self.class.class_eav_attributes
end

#eav_attributes ⇒ Object

get all the eav attribute instances available for this model instance

eg: if you model says ‘has_eav :through => :post_attribute’ these are all PostAttribute’s



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# File 'lib/has_eav.rb', line 158

def eav_attributes
  @eav_attributes ||= eav_class.all(
    :conditions => { self_key => self.id }
  )
end

#eav_attributes_list ⇒ Object

get a complete list of eav_attributes (class + instance)



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# File 'lib/has_eav.rb', line 187

def eav_attributes_list # :nodoc:
  (
    self.instance_eav_attributes + self.class_eav_attributes.keys
  ).collect { |attribute| attribute.to_s }.uniq
end

#eav_class ⇒ Object

get to the eav class



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# File 'lib/has_eav.rb', line 76

def eav_class
  self.class.eav_class
end

#instance_eav_attributes ⇒ Object

Override this to get some usable attributes

Cowardly refusing to adhere to all



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# File 'lib/has_eav.rb', line 88

def instance_eav_attributes
  []
end

#respond_to?(method_symbol, is_private = false) ⇒ Boolean

override respond_to?

Returns:

  • (Boolean) 


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# File 'lib/has_eav.rb', line 142

def respond_to? method_symbol, is_private=false
  if super == false
    method_name = method_symbol.to_s.gsub(/[\?=]$/, '')
    return true if eav_attributes_list.include? method_name

    false
  else
    true
  end
end