init_attributes

# File activerecord/lib/active_record/core.rb, line 564
    def init_attributes(_) # :nodoc:
      attrs = @attributes.deep_dup

      if self.class.composite_primary_key?
        @primary_key.each { |key| attrs.reset(key) }
      else
        attrs.reset(@primary_key)
      end

      attrs
    end