Class: ActiveModel::AttributeMutationTracker

Inherits:
Object
  • Object
show all
Defined in:
activemodel/lib/active_model/attribute_mutation_tracker.rb

Overview

:nodoc:

Direct Known Subclasses

ForcedMutationTracker

Constant Summary collapse

OPTION_NOT_GIVEN = 
Object.new

Instance Method Summary collapse

Constructor Details

#initialize(attributes) ⇒ AttributeMutationTracker

Returns a new instance of AttributeMutationTracker.



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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 10

def initialize(attributes)
  @attributes = attributes
end

Instance Method Details

#any_changes? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 40

def any_changes?
  attr_names.any? { |attr| changed?(attr) }
end

#change_to_attribute(attr_name) ⇒ Object 



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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 34

def change_to_attribute(attr_name)
  if changed?(attr_name)
    [original_value(attr_name), fetch_value(attr_name)]
  end
end

#changed?(attr_name, from: OPTION_NOT_GIVEN, to: OPTION_NOT_GIVEN) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 44

def changed?(attr_name, from: OPTION_NOT_GIVEN, to: OPTION_NOT_GIVEN)
  attribute_changed?(attr_name) &&
    (OPTION_NOT_GIVEN == from || original_value(attr_name) == type_cast(attr_name, from)) &&
    (OPTION_NOT_GIVEN == to || fetch_value(attr_name) == type_cast(attr_name, to))
end

#changed_attribute_names ⇒ Object 



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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 14

def changed_attribute_names
  attr_names.select { |attr_name| changed?(attr_name) }
end

#changed_in_place?(attr_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 50

def changed_in_place?(attr_name)
  attributes[attr_name].changed_in_place?
end

#changed_values ⇒ Object 



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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 18

def changed_values
  attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result|
    if changed?(attr_name)
      result[attr_name] = original_value(attr_name)
    end
  end
end

#changes ⇒ Object 



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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 26

def changes
  attr_names.each_with_object({}.with_indifferent_access) do |attr_name, result|
    if change = change_to_attribute(attr_name)
      result.merge!(attr_name => change)
    end
  end
end

#force_change(attr_name) ⇒ Object 



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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 63

def force_change(attr_name)
  forced_changes[attr_name] = fetch_value(attr_name)
end

#forget_change(attr_name) ⇒ Object 



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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 54

def forget_change(attr_name)
  attributes[attr_name] = attributes[attr_name].forgetting_assignment
  forced_changes.delete(attr_name)
end

#original_value(attr_name) ⇒ Object 



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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 59

def original_value(attr_name)
  attributes[attr_name].original_value
end