Class: Datamappify::Repository::UnitOfWork::PersistentStates::Object

Inherits:
Object
  • Object
show all
Includes:
ActiveModel::Dirty
Defined in:
lib/datamappify/repository/unit_of_work/persistent_states/object.rb

Overview

an object that mirrors an entity’s attributes and their initial (clean) values

Instance Method Summary collapse

Constructor Details

#initialize(entity) ⇒ Object

Returns a new instance of Object.

Parameters:



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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 10

def initialize(entity)
  @entity = entity

  attributes = attributes_for(@entity)
  attributes.each do |name, value|
    construct_attribute(name)
    set_value(name, value)
  end

  self.class.define_attribute_methods(attributes.keys)

  mark_as_dirty if new?
end

Instance Method Details

#attributes_for(entity) ⇒ Hash (private)

Entity attributes, based on whether the entity is lazy loaded

Parameters:

Returns:

  • (Hash) 


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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 115

def attributes_for(entity)
  entity.lazy_loaded? ? entity.cached_attributes : entity.attributes
end

#construct_attribute(name) ⇒ void (private)

This method returns an undefined value.

Constructs an attribute with a getter, setter and ‘_changed?’ method



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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 48

def construct_attribute(name)
  construct_getter(name)
  construct_setter(name)
  construct_changed(name)
end

#construct_changed(name) ⇒ void (private)

This method returns an undefined value.

Constructs the attr_changed? method

Parameters:

  • name (Symbol) 


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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 84

def construct_changed(name)
  define_singleton_method "#{name}_changed?" do
    changed_attributes.include?(name)
  end
end

#construct_getter(name) ⇒ void (private)

This method returns an undefined value.

Constructs an attribute getter

Parameters:

  • name (Symbol) 


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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 59

def construct_getter(name)
  define_singleton_method name do
    instance_variable_get "@#{name}"
  end
end

#construct_setter(name) ⇒ void (private)

This method returns an undefined value.

Constructs an attribute setter, the setter itself does NOT need to set the value as the value is never going to be used.

The setter sets the attr_will_change! flag when necessary.

Parameters:

  • name (Symbol) 


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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 73

def construct_setter(name)
  define_singleton_method "#{name}=" do |value|
    send(:attribute_will_change!, name) unless send(name) == value
  end
end

#mark_as_dirty ⇒ void (private)

This method returns an undefined value.

Mark all attributes as dirty, useful for a non-persisted object



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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 104

def mark_as_dirty
  attributes_for(@entity).each do |name, _|
    send(:attribute_will_change!, name)
  end
end

#new? ⇒ Boolean

Is the object new (not persisted yet)?

Returns:

  • (Boolean) 


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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 39

def new?
  @entity.id.nil?
end

#set_value(name, value) ⇒ any (private)

Sets an attribute value by making a copy of the data

Parameters:

  • name (Symbol)
  • value (any)

Returns:

  • (any) 


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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 97

def set_value(name, value)
  instance_variable_set "@#{name}", Marshal.load(Marshal.dump(value))
end

#update_values(entity) ⇒ void

This method returns an undefined value.

Updates all the attribute values according to the entity

Parameters:



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# File 'lib/datamappify/repository/unit_of_work/persistent_states/object.rb', line 29

def update_values(entity)
  attributes_for(entity).each do |name, value|
    construct_attribute(name)
    send("#{name}=", value)
  end
end