column method
Implementation
ColumnDefinition column(String field) => columns.firstWhere(
(c) => c.field == field,
orElse: () => throw ArgumentError('Unknown field $field in $name'),
);
ColumnDefinition column(String field) => columns.firstWhere(
(c) => c.field == field,
orElse: () => throw ArgumentError('Unknown field $field in $name'),
);