Method: Sequel::Plugins::List::InstanceMethods#before_validation

Defined in:
lib/sequel/plugins/list.rb

#before_validation ⇒ Object

Set the value of the position_field to the maximum value plus 1 unless the position field already has a value. If the list is empty, the position will be set to the model’s top_of_list value.



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# File 'lib/sequel/plugins/list.rb', line 190

def before_validation
  unless get_column_value(position_field)
    current_max = list_dataset.max(position_field)
    value = current_max.nil? ? model.top_of_list : current_max.to_i + 1
    set_column_value("#{position_field}=", value)
  end
  super
end