toJson method
Converts a Venue object to JSON object
Implementation
Map<String, dynamic> toJson() {
return {
'location': location.toJson(),
'title': title,
'address': address,
'foursquare_id': foursquareId,
'foursquare_type': foursquareType,
'google_place_id': googlePlaceId,
'google_place_type': googlePlaceType,
}..removeWhere(_nullFilter);
}