Module: ActiveRecord::AttributeMethods::Dirty

Extended by:
ActiveSupport::Concern
Includes:
ActiveModel::Dirty
Defined in:
lib/active_record/attribute_methods/dirty.rb

Overview

:nodoc:

Instance Method Summary collapse

Instance Method Details

#attribute_before_last_save(attr_name) ⇒ Object

Returns the original value of an attribute before the last save. Behaves similarly to attribute_was. This method is useful in after callbacks to get the original value of an attribute before the save that just occurred



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# File 'lib/active_record/attribute_methods/dirty.rb', line 165

def attribute_before_last_save(attr_name)
  mutations_before_last_save.original_value(attr_name)
end

#attribute_change ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 219

def attribute_change(*)
  emit_warning_if_needed("attribute_change", "saved_change_to_attribute")
  super
end

#attribute_change_to_be_saved(attr_name) ⇒ Object

Alias for ‘attribute_change`



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# File 'lib/active_record/attribute_methods/dirty.rb', line 185

def attribute_change_to_be_saved(attr_name)
  mutations_from_database.change_to_attribute(attr_name)
end

#attribute_changed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods/dirty.rb', line 224

def attribute_changed?(*)
  emit_warning_if_needed("attribute_changed?", "saved_change_to_attribute?")
  super
end

#attribute_changed_in_place?(attr_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods/dirty.rb', line 127

def attribute_changed_in_place?(attr_name)
  mutation_tracker.changed_in_place?(attr_name)
end

#attribute_in_database(attr_name) ⇒ Object

Alias for ‘attribute_was`



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# File 'lib/active_record/attribute_methods/dirty.rb', line 190

def attribute_in_database(attr_name)
  mutations_from_database.original_value(attr_name)
end

#attribute_was ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 214

def attribute_was(*)
  emit_warning_if_needed("attribute_was", "attribute_before_last_save")
  super
end

#attributes_in_database ⇒ Object

Alias for ‘changed_attributes`



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# File 'lib/active_record/attribute_methods/dirty.rb', line 210

def attributes_in_database
  changes_to_save.transform_values(&:first)
end

#changed ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 234

def changed(*)
  emit_warning_if_needed("changed", "saved_changes.keys")
  super
end

#changed? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods/dirty.rb', line 229

def changed?(*)
  emit_warning_if_needed("changed?", "saved_changes?")
  super
end

#changed_attribute_names_to_save ⇒ Object

Alias for ‘changed`



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# File 'lib/active_record/attribute_methods/dirty.rb', line 205

def changed_attribute_names_to_save
  changes_to_save.keys
end

#changed_attributes ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 97

def changed_attributes
  # This should only be set by methods which will call changed_attributes
  # multiple times when it is known that the computed value cannot change.
  if defined?(@cached_changed_attributes)
    @cached_changed_attributes
  else
    emit_warning_if_needed("changed_attributes", "saved_changes.transform_values(&:first)")
    super.reverse_merge(mutation_tracker.changed_values).freeze
  end
end

#changes ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 108

def changes
  cache_changed_attributes do
    emit_warning_if_needed("changes", "saved_changes")
    super
  end
end

#changes_applied ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 71

def changes_applied
  @previous_mutation_tracker = mutation_tracker
  @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new
  clear_mutation_trackers
end

#changes_internally_applied ⇒ Object

:nodoc:



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# File 'lib/active_record/attribute_methods/dirty.rb', line 65

def changes_internally_applied # :nodoc:
  @mutations_before_last_save = mutation_tracker
  forget_attribute_assignments
  @mutations_from_database = AttributeMutationTracker.new(@attributes)
end

#changes_to_save ⇒ Object

Alias for ‘changes`



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# File 'lib/active_record/attribute_methods/dirty.rb', line 200

def changes_to_save
  mutations_from_database.changes
end

#clear_attribute_changes(attr_names) ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 90

def clear_attribute_changes(attr_names)
  super
  attr_names.each do |attr_name|
    clear_attribute_change(attr_name)
  end
end

#clear_changes_information ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 77

def clear_changes_information
  @previous_mutation_tracker = nil
  @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new
  forget_attribute_assignments
  clear_mutation_trackers
end

#has_changes_to_save? ⇒ Boolean

Alias for ‘changed?`

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods/dirty.rb', line 195

def has_changes_to_save?
  mutations_from_database.any_changes?
end

#initialize_dup(other) ⇒ Object

:nodoc:



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# File 'lib/active_record/attribute_methods/dirty.rb', line 57

def initialize_dup(other) # :nodoc:
  super
  @attributes = self.class._default_attributes.map do |attr|
    attr.with_value_from_user(@attributes.fetch_value(attr.name))
  end
  clear_mutation_trackers
end

#previous_changes ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 115

def previous_changes
  unless previous_mutation_tracker.equal?(mutations_before_last_save)
    ActiveSupport::Deprecation.warn(<<-EOW.strip_heredoc)
      The behavior of `previous_changes` inside of after callbacks is
      deprecated without replacement. In the next release of Rails,
      this method inside of `after_save` will return the changes that
      were just saved.
    EOW
  end
  previous_mutation_tracker.changes
end

#raw_write_attribute(attr_name) ⇒ Object 



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# File 'lib/active_record/attribute_methods/dirty.rb', line 84

def raw_write_attribute(attr_name, *)
  result = super
  clear_attribute_change(attr_name)
  result
end

#reload ⇒ Object

reload the record and clears changed attributes.



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# File 'lib/active_record/attribute_methods/dirty.rb', line 49

def reload(*)
  super.tap do
    @previous_mutation_tracker = nil
    clear_mutation_trackers
    @changed_attributes = ActiveSupport::HashWithIndifferentAccess.new
  end
end

#save ⇒ Object

Attempts to save the record and clears changed attributes if successful.



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# File 'lib/active_record/attribute_methods/dirty.rb', line 34

def save(*)
  if status = super
    changes_applied
  end
  status
end

#save! ⇒ Object

Attempts to save! the record and clears changed attributes if successful.



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# File 'lib/active_record/attribute_methods/dirty.rb', line 42

def save!(*)
  super.tap do
    changes_applied
  end
end

#saved_change_to_attribute(attr_name) ⇒ Object

Returns the change to an attribute during the last save. If the attribute was changed, the result will be an array containing the original value and the saved value.

Behaves similarly to attribute_change. This method is useful in after callbacks, to see the change in an attribute that just occurred

This method can be invoked as ‘saved_change_to_name` in instead of `saved_change_to_attribute(“name”)`



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# File 'lib/active_record/attribute_methods/dirty.rb', line 157

def saved_change_to_attribute(attr_name)
  mutations_before_last_save.change_to_attribute(attr_name)
end

#saved_change_to_attribute?(attr_name, **options) ⇒ Boolean

Did this attribute change when we last saved? This method can be invoked as ‘saved_change_to_name?` instead of `saved_change_to_attribute?(“name”)`. Behaves similarly to attribute_changed?. This method is useful in after callbacks to determine if the call to save changed a certain attribute.

Options

from When passed, this method will return false unless the original value is equal to the given option

to When passed, this method will return false unless the value was changed to the given value

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods/dirty.rb', line 144

def saved_change_to_attribute?(attr_name, **options)
  mutations_before_last_save.changed?(attr_name, **options)
end

#saved_changes ⇒ Object

Returns a hash containing all the changes that were just saved.



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# File 'lib/active_record/attribute_methods/dirty.rb', line 175

def saved_changes
  mutations_before_last_save.changes
end

#saved_changes? ⇒ Boolean

Did the last call to ‘save` have any changes to change?

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods/dirty.rb', line 170

def saved_changes?
  mutations_before_last_save.any_changes?
end

#will_save_change_to_attribute?(attr_name, **options) ⇒ Boolean

Alias for ‘attribute_changed?`

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods/dirty.rb', line 180

def will_save_change_to_attribute?(attr_name, **options)
  mutations_from_database.changed?(attr_name, **options)
end