toJson method
Implementation
Map<String, dynamic> toJson() {
final contains = this.contains;
final eq = this.eq;
final exists = this.exists;
final neq = this.neq;
return {
if (contains != null) 'contains': contains,
if (eq != null) 'eq': eq,
if (exists != null) 'exists': exists,
if (neq != null) 'neq': neq,
};
}