groupByDesc method
Group rows by column in descending order.
var userEloquent = UserEloquent();
// group users by 'name' column
userEloquent.groupByDesc('name').get();
Implementation
/// ```dart
/// var userEloquent = UserEloquent();
///
/// // group users by 'name' column
/// userEloquent.groupByDesc('name').get();
/// ```
Generator groupByDesc(String? columnName) {
_groupBy = columnName;
_sort = Sort.descending;
return this;
}