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Class: ActiveModel::AttributeMutationTracker

Do not use. This class is for internal use only.
Relationships & Source Files
Extension / Inclusion / Inheritance Descendants
Subclasses:
ForcedMutationTracker
Inherits: Object
Defined in: activemodel/lib/active_model/attribute_mutation_tracker.rb

Constant Summary

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(attributes) ⇒ AttributeMutationTracker

[ GitHub ] 

  


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



def initialize(attributes)
  @attributes = attributes
end


  







Instance Attribute Details



  

    #any_changes?  ⇒ Boolean  (readonly)
  

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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


  








  

    #attributes   (readonly, private)
  

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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 68



attr_reader :attributes


  







Instance Method Details



  

    #attr_names   (private)
  

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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 74



def attr_names
  attributes.keys
end


  








  

    #attribute_changed?(attr_name)  ⇒ Boolean  (private)
  



  

    
  





  


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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 78



def attribute_changed?(attr_name)
  forced_changes.include?(attr_name) || !!attributes[attr_name].changed?
end


  








  

    #change_to_attribute(attr_name)  
  

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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 
  



  

    
  





  


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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  
  

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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 
  



  

    
  





  


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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  
  

  [ GitHub ]


  

  


# 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  
  

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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


  








  

    #fetch_value(attr_name)   (private)
  

  [ GitHub ]


  

  


# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 82



def fetch_value(attr_name)
  attributes.fetch_value(attr_name)
end


  








  

    #force_change(attr_name)  
  

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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


  








  

    #forced_changes   (private)
  

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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 70



def forced_changes
  @forced_changes ||= {}
end


  








  

    #forget_change(attr_name)  
  

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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)  
  

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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


  








  

    #type_cast(attr_name, value)   (private)
  

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# File 'activemodel/lib/active_model/attribute_mutation_tracker.rb', line 86



def type_cast(attr_name, value)
  attributes[attr_name].type_cast(value)
end