dbSubCategories constant

List<List<String>> const dbSubCategories = const <List<String>> [const <String> ['alcohol', 'soft_drinks'], const <String> ['simple_food'], const <String> ['to_eat', 'to_drink']]

Paths for the different subcategories

Implementation 

static const List<List<String>> dbSubCategories = const <List<String>>[
  const <String>['alcohol', 'soft_drinks'],
  const <String>['simple_food'],
  const <String>['to_eat', 'to_drink'],
]