and method

SelectorBuilder and(
  1. SelectorBuilder other
)

Combine current expression with expression in parameter. See MongoDB doc SelectorBuilder provides implicit and operator for chained queries so these two expression will produce identical MongoDB queries

where.eq('price', 1.99).lt('qty', 20).eq('sale', true);
where.eq('price', 1.99).and(where.lt('qty',20)).and(where.eq('sale', true))

Both these queries would produce json map:

{'\$query': {'\$and': [{'price':1.99},{'qty': {'\$lt': 20 }}, {'sale': true }]}}

Implementation

SelectorBuilder and(SelectorBuilder other) {
  if (_query.isEmpty) {
    throw StateError('`And` operation is not supported on empty query');
  }
  _addExpressionMap(other._query);
  return this;
}