Class: DataMapper::Property::Key

Inherits:
Object
  • Object
show all
Includes:
PassThroughLoadDump
Defined in:
lib/dm-appengine/properties/key.rb

Direct Known Subclasses

AncestorKey

Constant Summary collapse

VALID_KEY_OPTS = 
Set.new([:id, :name, :parent]).freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(model, name, options = {}, type = nil) ⇒ Key

THIS IS A HACK. I’m not sure the best way to do this. The key is not technically required at object creation time, but should be seen as required after that.



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# File 'lib/dm-appengine/properties/key.rb', line 63

def initialize(model, name, options = {}, type = nil)
  super
  @serial = options.fetch(:serial, @key)
end

Class Method Details

.kind(property) ⇒ Object 



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# File 'lib/dm-appengine/properties/key.rb', line 50

def self.kind(property)
  property.model.repository.adapter.kind(property.model)
end

.typecast_to_primitive(property, value) ⇒ Object 



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# File 'lib/dm-appengine/properties/key.rb', line 22

def self.typecast_to_primitive(property, value)
  case value
    when ::AppEngine::Datastore::Key, ::NilClass
      value
    when ::Integer, ::String
      AppEngine::Datastore::Key.from_path(kind(property), value)
    when ::Symbol
      AppEngine::Datastore::Key.from_path(kind(property), value.to_s)
    when ::Hash
      parent = self.typecast_to_primitive(property, value[:parent])
      id = value[:id]
      name = value[:name]
      if id
        id_or_name = id.to_i
      elsif name
        id_or_name = name.to_s
      end
      if parent
        id_or_name ||= 0
        parent.getChild(kind(property), id_or_name)
      else
        self.typecast_to_primitive(property, property.typecast(id_or_name))
      end
    else
      raise ArgumentError, "Unsupported key value #{value.inspect} (a #{value.class})"
  end
end

Instance Method Details

#dump(value) ⇒ Object 



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# File 'lib/dm-appengine/properties/key.rb', line 7

def dump(value)
  typecast(value)
end

#load(value) ⇒ Object 



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# File 'lib/dm-appengine/properties/key.rb', line 10

def load(value)
  value
end

#typecast(value) ⇒ Object 



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# File 'lib/dm-appengine/properties/key.rb', line 14

def typecast(value)
  if value.nil?
    value
  else
    super
  end
end

#typecast_to_primitive(value) ⇒ Object 



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# File 'lib/dm-appengine/properties/key.rb', line 54

def typecast_to_primitive(value)
  self.class.typecast_to_primitive(self, value)
end

#valid?(value, negated = false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/dm-appengine/properties/key.rb', line 70

def valid?(value, negated = false)
  if value.kind_of? Hash
    return false unless value.keys.all?{|k| VALID_KEY_OPTS.include? k}
    !(value[:id] && value[:name])
  else
    super
  end
end