generator - make sure relation fields are not tagged unsigned in the model

Author: Ivan Dlugos

generator/integration-tests/relations/lib/lib.dart

@@ -25,4 +25,4 @@ class C {
 
   String text;
   C(this.text);
-}
+}

generator/lib/src/code_chunks.dart

@@ -208,8 +208,7 @@ class CodeChunks {
             // constructor anyway - there's no Int8List.generate() factory.
             fbReader = 'fb.ListReader<int>(fb.Int8Reader())';
             if (p.fieldIsNullable) {
-              preLines.add(
-                  'final $valueVar = ${readFieldOrNull()};');
+              preLines.add('final $valueVar = ${readFieldOrNull()};');
               return '$valueVar == null ? null : ${p.fieldType}.fromList($valueVar)';
             } else {
               return '${p.fieldType}.fromList(${readFieldNonNull('[]')})';
@@ -229,8 +228,7 @@ class CodeChunks {
       }
       if (p.fieldType == 'DateTime') {
         if (p.fieldIsNullable) {
-          preLines
-              .add('final $valueVar = ${readFieldOrNull()};');
+          preLines.add('final $valueVar = ${readFieldOrNull()};');
           if (p.type == OBXPropertyType.Date) {
             return '$valueVar == null ? null : DateTime.fromMillisecondsSinceEpoch($valueVar)';
           } else if (p.type == OBXPropertyType.DateNano) {

generator/lib/src/entity_resolver.dart

@@ -196,6 +196,9 @@ class EntityResolver extends Builder {
           prop.relationTarget = relTargetName;
           prop.flags |= OBXPropertyFlags.INDEXED;
           prop.flags |= OBXPropertyFlags.INDEX_PARTIAL_SKIP_ZERO;
+
+          // IDs must not be tagged unsigned for compatibility reasons
+          prop.flags &= ~OBXPropertyFlags.UNSIGNED;
         }
 
         // Index and unique annotation.