Backlink support #996

nielsenko · 2022-10-27T07:51:47Z

We now support named back links

@RealmModel()
class _Source {
  _Target? target
}

@RealmModel()
class _Target {
  @Backlink(#target)
  late Iterable<_Source> backlinks;
}

...
final target = Target();
final source = realm.write(() => realm.add(Source(target: target)));

expect(source.target, target);
expect(target.backlinks, [source]);

Resolves: #693

coveralls · 2022-10-27T08:20:41Z

Pull Request Test Coverage Report for Build 3346094796

92 of 97 (94.85%) changed or added relevant lines in 12 files are covered.
No unchanged relevant lines lost coverage.
Overall coverage increased (+0.2%) to 89.611%

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
generator/lib/src/field_element_ex.dart	29	30	96.67%
generator/lib/src/class_element_ex.dart	2	6	33.33%

Totals
Change from base Build 3343652406:	0.2%
Covered Lines:	2648
Relevant Lines:	2955

💛 - Coveralls

nirinchev · 2022-10-27T10:22:37Z

generator/lib/src/class_element_ex.dart

@@ -161,6 +161,9 @@ extension ClassElementEx on ClassElement {
            todo: 'Remove the @PrimaryKey annotation from the field or set the model type to a value different from ObjectType.embeddedObject.');
      }

+      // Computed fields go last. This is important for the schema generation.
+      mappedFields.sort((a, b) => a.isComputed ^ b.isComputed ? (a.isComputed ? 1 : -1) : -1);


That's a bit too much math. Isn't easier to use sortedby? Like, on line 152, we could do something like:

final mappedFields = fields.realmInfo.sortedBy<num>((f) => f.isComputed ? 0 : 1);

We would need to pull in import 'package:collection/collection.dart and I dislike the need to add <num> bit to sortedBy (<int> won't do).

Also List.sort is in-place, but apparently not stable 🤔 ... nor is sortedBy

Let me think a bit about this. I would like a stable sort, so that we only do the minimal needed changes to the ordering

test/backlinks_test.dart

blagoev

Its good. I have small suggestions.

generator/lib/src/dart_type_ex.dart

generator/test/test_util.dart

test/backlinks_test.dart

CHANGELOG.md

common/lib/src/realm_common_base.dart

generator/lib/src/class_element_ex.dart

generator/lib/src/field_element_ex.dart

generator/test/test_util.dart

lib/src/realm_object.dart

test/backlinks_test.dart

nirinchev · 2022-10-28T13:11:54Z

generator/lib/src/class_element_ex.dart

@@ -149,7 +152,8 @@ extension ClassElementEx on ClassElement {

      final objectType = ObjectType.values[modelInfo.value.getField('type')!.getField('index')!.toIntValue()!];

-      final mappedFields = fields.realmInfo.toList();
+      // Realm Core requires computed properties at the end so we sort them at generation time versus doing it at runtime every time.
+      final mappedFields = fields.realmInfo.toList()..sort((a, b) => a.isComputed ^ b.isComputed ? (a.isComputed ? 1 : -1) : -1);


I'm still not sure this sorting is super readable. How about:

Suggested change

final mappedFields = fields.realmInfo.toList()..sort((a, b) => a.isComputed ^ b.isComputed ? (a.isComputed ? 1 : -1) : -1);

final mappedFields = fields.realmInfo.toList()..sort((a, b) => a.isComputed == b.isComputed ? 0 : (a.isComputed ? 1 : -1));

Or even simpler:

Suggested change

final mappedFields = fields.realmInfo.toList()..sort((a, b) => a.isComputed ^ b.isComputed ? (a.isComputed ? 1 : -1) : -1);

final mappedFields = fields.realmInfo.toList()..sort((a, b) => a.isComputed ? 1 : -1);

Not a dealbreaker though - it should still be correct, just feels a little complicated to understand.

I like to read it like: If a and b are different wrt. computed, then if a is computed, a goes last, otherwise a goes first.

Does it matter that they're different though? I think my last suggestion reads like: "if a is computed, it goes last", which would be equivalent to "sort this array of bools in ascending order".

Co-authored-by: blagoev <lubo@blagoev.com>

Taco55 · 2022-11-06T20:33:12Z

After trying this new feature I get the following error after running the generator:

[SEVERE] realm:realm_generator on lib/schemas/category.dart:

Invalid argument(s): Element (FieldElementImpl) List<$Category> categories is not defined in this library.
#0      ResolvedLibraryResultImpl.getElementDeclaration.<anonymous closure> (package:analyzer/src/dart/analysis/results.dart:251:9)
#1      ListMixin.firstWhere (dart:collection/list.dart:166:38)
#2      ResolvedLibraryResultImpl.getElementDeclaration (package:analyzer/src/dart/analysis/results.dart:247:28)
#3      getDeclarationFromElement (package:realm_generator/src/element.dart:38:34)
#4      FieldElementEx.declarationAstNode (package:realm_generator/src/field_element_ex.dart:40:46)
#5      ElementEx.declarationAstNode (package:realm_generator/src/element.dart:72:43)
#6      ElementEx._annotationsInfoOfExact (package:realm_generator/src/element.dart:79:18)
#7      _SyncStarIterator.moveNext (dart:async-patch/async_patch.dart:710:21)
#8      new _GrowableList._ofOther (dart:core-patch/growable_array.dart:202:26)
#9      new _GrowableList.of (dart:core-patch/growable_array.dart:152:26)
#10     new List.of (dart:core-patch/array_patch.dart:51:28)
#11     Iterable.toList (dart:core/iterable.dart:470:12)
#12     ElementEx.annotationInfoOfExact (package:realm_generator/src/element.dart:89:58)
#13     FieldElementEx.realmInfo (package:realm_generator/src/field_element_ex.dart:250:44)
#14     _extension#0.realmInfo (package:realm_generator/src/class_element_ex.dart:37:22)
#15     _SyncStarIterator.moveNext (dart:async-patch/async_patch.dart:710:21)
#16     new _GrowableList._ofOther (dart:core-patch/growable_array.dart:202:26)
#17     new _GrowableList.of (dart:core-patch/growable_array.dart:152:26)
#18     new List.of (dart:core-patch/array_patch.dart:51:28)
#19     Iterable.toList (dart:core/iterable.dart:470:12)
#20     ClassElementEx.realmInfo (package:realm_generator/src/class_element_ex.dart:156:45)
#21     _extension#0.realmInfo.<anonymous closure> (package:realm_generator/src/realm_object_generator.dart:71:58)
#22     MappedIterator.moveNext (dart:_internal/iterable.dart:391:20)
#23     WhereIterator.moveNext (dart:_internal/iterable.dart:438:22)
#24     CastIterator.moveNext (dart:_internal/cast.dart:61:30)
#25     ExpandIterator.moveNext (dart:_internal/iterable.dart:477:21)
#26     Iterable.join (dart:core/iterable.dart:423:19)
#27     RealmObjectGenerator.generate.<anonymous closure>.<anonymous closure> (package:realm_generator/src/realm_object_generator.dart:61:69)
#28     _rootRun (dart:async/zone.dart:1391:13)
#29     _CustomZone.run (dart:async/zone.dart:1293:19)
#30     _runZoned (dart:async/zone.dart:1829:10)
#31     runZonedGuarded (dart:async/zone.dart:1817:12)
#32     scopeSession (package:realm_generator/src/session.dart:44:16)
#33     RealmObjectGenerator.generate.<anonymous closure> (package:realm_generator/src/realm_object_generator.dart:59:16)
<asynchronous suspension>
#34     measure.<anonymous closure> (package:realm_generator/src/measure.dart:50:18)
<asynchronous suspension>
#35     measure (package:realm_generator/src/measure.dart:47:7)
<asynchronous suspension>
#36     RealmObjectGenerator.generate (package:realm_generator/src/realm_object_generator.dart:56:12)
<asynchronous suspension>
#37     _generate (package:source_gen/src/builder.dart:352:23)
<asynchronous suspension>
#38     Stream.toList.<anonymous closure> (dart:async/stream.dart:1349:9)
<asynchronous suspension>

    ╷
7   │ @RealmModel()
8   │ class $Category {
    │       ━━━━━━━━━ in realm model for 'Category'
... │
32  │   @Backlink(#categories)
33  │   late Iterable<$Item> items;
    │                                 ^^^^^^^^^^^^^^ !
    ╵
Unexpected error. Please open an issue on: https://github.com/realm/realm-dart

I get the same error for Many-to-one and many-to-many relationships. Still anything wrong?

nielsenko · 2022-11-07T06:36:47Z

@Taco55 This is because the backlink is cross file. It was first reported here #1015. A fix is already merged, but not released yet. You can work around the issue by ensuring that the class with the backlink field is defined in the same file as the linking class.

Sorry for the inconvenience.

Taco55 · 2022-11-07T07:17:44Z

@nielsenko Thanks for the quick answer. I will check it out!

cla-bot bot added the cla: yes label Oct 27, 2022

github-actions bot assigned nielsenko Oct 27, 2022

nielsenko force-pushed the kn/backlinks branch from 8483279 to 46bca46 Compare October 27, 2022 08:12

nielsenko force-pushed the kn/backlinks branch 2 times, most recently from dde705d to d795e54 Compare October 27, 2022 09:33

nirinchev reviewed Oct 27, 2022

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nielsenko requested review from blagoev, nirinchev and desistefanova October 27, 2022 17:46

nielsenko marked this pull request as ready for review October 27, 2022 17:46

blagoev suggested changes Oct 28, 2022

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nielsenko added 7 commits October 28, 2022 14:03

Add Backlink annotation

08a9e9e

Support back-links in generator

8f311dd

Test back-link generator support

8d5a817

Support backlinks

04746dd

Backlink tests

55cea96

Update CHANGELOG

a66c5a3

Harden generator wrt. backlinks

ec0e3e5

nielsenko added 2 commits October 28, 2022 14:03

Handle @mapto on backlink targets

bb82cd1

Increase analyzer constraint to 4.7.0^

923bebf

nielsenko force-pushed the kn/backlinks branch 2 times, most recently from b04f002 to 3352c30 Compare October 28, 2022 13:04

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nirinchev approved these changes Oct 28, 2022

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blagoev approved these changes Oct 28, 2022

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Apply suggestions from code review

7bdd8ec

Co-authored-by: blagoev <lubo@blagoev.com>

nielsenko force-pushed the kn/backlinks branch from 3352c30 to 7bdd8ec Compare October 28, 2022 14:14

nielsenko merged commit fcc825b into master Oct 28, 2022

nielsenko deleted the kn/backlinks branch October 28, 2022 14:17

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Backlink support #996

Backlink support #996

nielsenko commented Oct 27, 2022 •

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Taco55 commented Nov 6, 2022 •

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nielsenko commented Nov 7, 2022

Taco55 commented Nov 7, 2022

	final mappedFields = fields.realmInfo.toList()..sort((a, b) => a.isComputed ^ b.isComputed ? (a.isComputed ? 1 : -1) : -1);
	final mappedFields = fields.realmInfo.toList()..sort((a, b) => a.isComputed == b.isComputed ? 0 : (a.isComputed ? 1 : -1));

Backlink support #996

Backlink support #996

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