Module: ActiveRecord::Store::ClassMethods

# File 'activerecord/lib/active_record/store.rb', line 109

def store_accessor(store_attribute, *keys, prefix: nil, suffix: nil)
  keys = keys.flatten

  accessor_prefix =
    case prefix
    when String, Symbol
      "#{prefix}_"
    when TrueClass
      "#{store_attribute}_"
    else
      ""
    end
  accessor_suffix =
    case suffix
    when String, Symbol
      "_#{suffix}"
    when TrueClass
      "_#{store_attribute}"
    else
      ""
    end

  _store_accessors_module.module_eval do
    keys.each do |key|
      accessor_key = "#{accessor_prefix}#{key}#{accessor_suffix}"

      define_method("#{accessor_key}=") do |value|
        write_store_attribute(store_attribute, key, value)
      end

      define_method(accessor_key) do
        read_store_attribute(store_attribute, key)
      end

      define_method("#{accessor_key}_changed?") do
        return false unless attribute_changed?(store_attribute)
        prev_store, new_store = changes[store_attribute]
        prev_store&.dig(key) != new_store&.dig(key)
      end

      define_method("#{accessor_key}_change") do
        return unless attribute_changed?(store_attribute)
        prev_store, new_store = changes[store_attribute]
        [prev_store&.dig(key), new_store&.dig(key)]
      end

      define_method("#{accessor_key}_was") do
        return unless attribute_changed?(store_attribute)
        prev_store, _new_store = changes[store_attribute]
        prev_store&.dig(key)
      end

      define_method("saved_change_to_#{accessor_key}?") do
        return false unless saved_change_to_attribute?(store_attribute)
        prev_store, new_store = saved_change_to_attribute(store_attribute)
        prev_store&.dig(key) != new_store&.dig(key)
      end

      define_method("saved_change_to_#{accessor_key}") do
        return unless saved_change_to_attribute?(store_attribute)
        prev_store, new_store = saved_change_to_attribute(store_attribute)
        [prev_store&.dig(key), new_store&.dig(key)]
      end

      define_method("#{accessor_key}_before_last_save") do
        return unless saved_change_to_attribute?(store_attribute)
        prev_store, _new_store = saved_change_to_attribute(store_attribute)
        prev_store&.dig(key)
      end
    end
  end

  # assign new store attribute and create new hash to ensure that each class in the hierarchy
  # has its own hash of stored attributes.
  self.local_stored_attributes ||= {}
  self.local_stored_attributes[store_attribute] ||= []
  self.local_stored_attributes[store_attribute] |= keys
end

# File 'activerecord/lib/active_record/store.rb', line 196

def stored_attributes
  parent = superclass.respond_to?(:stored_attributes) ? superclass.stored_attributes : {}
  if local_stored_attributes
    parent.merge!(local_stored_attributes) { |k, a, b| a | b }
  end
  parent
end