toJson method
Implementation
Map<String, dynamic> toJson() => {
if (relevant.isNotEmpty)
'relevant': relevant.map((f) => f.toJson()).toList(),
if (coverage.isNotEmpty)
'coverage': coverage.map((c) => c.toJson()).toList(),
if (knowledge.isNotEmpty)
'knowledge': knowledge.map((k) => k.toJson()).toList(),
};