Created
May 30, 2025 02:31
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Some of the mapping hooks that can be used with the dart mappable (which I currently use)
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| import 'package:dart_mappable/dart_mappable.dart'; | |
| import 'package:intl/intl.dart'; | |
| class DateTimeHook extends MappingHook { | |
| const DateTimeHook(); | |
| @override | |
| Object? beforeEncode(Object? value) { | |
| if (value is DateTime) { | |
| //return in yyyy-MM-dd format | |
| return DateFormat('dd-MM-yyyy').format(value); | |
| } | |
| return super.beforeEncode(value); | |
| } | |
| } | |
| class IntToBooleanHook extends MappingHook { | |
| const IntToBooleanHook(); | |
| @override | |
| Object? beforeDecode(Object? value) { | |
| if (value is int) { | |
| return value == 1; | |
| } | |
| return super.beforeDecode(value); | |
| } | |
| @override | |
| Object? beforeEncode(Object? value) { | |
| if (value is bool) { | |
| return value ? 1 : 0; | |
| } | |
| return super.beforeEncode(value); | |
| } | |
| } | |
| class StringToBooleanHook extends MappingHook { | |
| const StringToBooleanHook(); | |
| @override | |
| Object? beforeDecode(Object? value) { | |
| if (value is String) { | |
| return value == 'True' || value == 'Yes' || value == "Y"; | |
| } | |
| return super.beforeDecode(value); | |
| } | |
| @override | |
| Object? beforeEncode(Object? value) { | |
| if (value is bool) { | |
| return value ? 'True' : 'False'; | |
| } | |
| return super.beforeEncode(value); | |
| } | |
| } | |
| class IgnoreFieldsHook extends MappingHook { | |
| const IgnoreFieldsHook(this.fields); | |
| final List<String> fields; | |
| @override | |
| Object? beforeDecode(Object? value) { | |
| if (value is Map) { | |
| for (var f in fields) { | |
| value.remove(f); | |
| } | |
| } | |
| return value; | |
| } | |
| } | |
| // Hook to convert String to double, handling empty strings or "-" as null | |
| class StringToDoubleOrNullHook extends MappingHook { | |
| const StringToDoubleOrNullHook(); | |
| @override | |
| dynamic beforeDecode(dynamic value) { | |
| if (value is String) { | |
| if (value.isEmpty || value == "-") { | |
| return null; | |
| } | |
| return double.tryParse(value); | |
| } | |
| if (value is num) { | |
| return value.toDouble(); | |
| } | |
| return value; | |
| } | |
| } | |
| // Hook to convert String to int, handling empty strings or "-" as null | |
| class StringToIntOrNullHook extends MappingHook { | |
| const StringToIntOrNullHook(); | |
| @override | |
| dynamic beforeDecode(dynamic value) { | |
| if (value is String) { | |
| if (value.isEmpty || value == "-") { | |
| return null; | |
| } | |
| return int.tryParse(value); | |
| } | |
| if (value is num) { | |
| return value.toInt(); | |
| } | |
| return value; | |
| } | |
| } | |
| class IgnoreLargeNumbers extends MappingHook { | |
| const IgnoreLargeNumbers(); | |
| @override | |
| Object? beforeDecode(Object? value) { | |
| if (value is Map) { | |
| return value.map((key, value) { | |
| if (value is BigInt) { | |
| return MapEntry(key.toString(), null); | |
| } | |
| if (value is double && value.toStringAsFixed(2).length > 16) { | |
| return MapEntry(key.toString(), null); | |
| } | |
| if (value is List) { | |
| return MapEntry( | |
| key.toString(), | |
| value.map((e) { | |
| if (e is Map) { | |
| return e.map((key, value) { | |
| if (value is BigInt) { | |
| return MapEntry(key.toString(), null); | |
| } | |
| if (value is double && value.toString().length > 16) { | |
| return MapEntry(key.toString(), null); | |
| } | |
| return MapEntry(key.toString(), value); | |
| }); | |
| } | |
| return e; | |
| }).toList(), | |
| ); | |
| } | |
| return MapEntry(key.toString(), value); | |
| }); | |
| } | |
| return value; | |
| } | |
| } |
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