2.6.0 Many-to-many Models Not Backwards Compatible Wrt Id

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Serverpod 2.6.0: Many-to-Many Models Not Backwards Compatible

Introduction

Serverpod is a powerful framework for building scalable and efficient applications. However, with the release of version 2.6.0, some users have encountered issues with many-to-many models not being backwards compatible. In this article, we will delve into the details of this issue, explore the possible causes, and provide a solution to resolve the problem.

Describe the Bug

After upgrading to Serverpod 2.6.0 from version 2.4.0 and fetching the new packages using pub get, users have reported the following errors:

../../project/project_server/lib/src/generated/first.dart:113:8: Error: The field 'First.id' has type 'int?', which does not match the corresponding type, 'dynamic', in the overridden setter, 'TableRow.id'.
  int? id;
       ^
/home/flutter/.pub-cache/hosted/pub.dev/serverpod-2.6.0/lib/src/database/concepts/table.dart:13:8: Context: This is the overridden method ('id').
  T_ID id;
       ^
../../project/project_server/lib/src/generated/first_second_map.dart:55:8: Error: The field 'FirstSecondMap.id' has type 'int?', which does not match the corresponding type, 'dynamic', in the overridden setter, 'TableRow.id'.
  int? id;
       ^
/home/flutter/.pub-cache/hosted/pub.dev/serverpod-2.6.0/lib/src/database/concepts/table.dart:13:8: Context: This is the overridden method ('id').
  T_ID id;
       ^
../../project/project_server/lib/src/generated/second.dart:47:8: Error: The field 'Second.id' has type 'int?', which does not match the corresponding type, 'dynamic', in the overridden setter, 'TableRow.id'.
  int? id;
       ^
/home/flutter/.pub-cache/hosted/pub.dev/serverpod-2.6.0/lib/src/database/concepts/table.dart:13:8: Context: This is the overridden method ('id').
  T_ID id;

To Reproduce

To reproduce this issue, follow these steps:

  1. Add a many-to-many relation: Create a many-to-many relation as described in the Serverpod documentation using version 2.4.0.
class: First
table: first
fields:
    name: String,
    second: List<Second>?, relation(name=second_relation)

class: Second
table: second
fields:
    name: String
    first: List<First>?, relation(name=first_relation)

class: FirstSecondMap
table: first_second_map
fields:
  first: First?, relation(name=second_relation)
  second: Second?, relation(name=first_relation)
indexes:
  first_second_idx:
    fields: firstId, secondId
    unique: true
  1. Generate the code: Generate the code using the Serverpod CLI.
  2. Update Serverpod to 2.6.0: Update Serverpod to version 2.6.0 and fetch the new packages using pub get.
  3. See errors reported by pub get: Run pub get and observe the errors reported.

Expected Behavior

There should be no reports of backwards incompatibility, and the code should work as expected.

Library Version

Serverpod: 2.6.0 from 2.4.0 Dart: Dart SDK version: 3.7.0 (stable) (Wed Feb 5 04:53:58 2025 -0800) on "linux_x64"

Platform Information

Ubuntu 25.4 running as a VS code devcontainer.

Additional Context

Regenerating the code fixes the errors.

How Experienced are you with this Library?

None

Are you interested in working on a PR for this?

  • [ ] I want to work on this

Solution

The solution to this issue is to regenerate the code using the Serverpod CLI. This will update the code to match the new version of Serverpod and resolve the errors.

Conclusion

In conclusion, the many-to-many models in Serverpod 2.6.0 are not backwards compatible with version 2.4.0. However, regenerating the code using the Serverpod CLI resolves the issue and allows the code to work as expected. We hope this article has provided valuable insights into this issue and has helped users resolve the problem.

Future Work

In the future, we recommend that Serverpod developers provide a clear migration guide for users upgrading from version 2.4.0 to 2.6.0. This will help users understand the changes and ensure a smooth transition.

References

Introduction

In our previous article, we explored the issue of many-to-many models not being backwards compatible in Serverpod 2.6.0. In this article, we will provide a Q&A section to address some of the common questions and concerns related to this issue.

Q: What is the cause of this issue?

A: The cause of this issue is due to changes in the Serverpod database schema in version 2.6.0. The new schema introduces a new type for IDs, which is not backwards compatible with the previous version.

Q: How can I resolve this issue?

A: To resolve this issue, you can regenerate the code using the Serverpod CLI. This will update the code to match the new version of Serverpod and resolve the errors.

Q: What are the benefits of regenerating the code?

A: Regenerating the code provides several benefits, including:

  • Updated schema: The regenerated code will use the new schema introduced in Serverpod 2.6.0.
  • Resolved errors: The regenerated code will resolve the errors reported by pub get.
  • Improved performance: The regenerated code may improve performance due to the updated schema.

Q: Can I avoid regenerating the code?

A: Unfortunately, no. Regenerating the code is the only way to resolve the issue and ensure that your code works as expected.

Q: What if I have custom code that relies on the old schema?

A: If you have custom code that relies on the old schema, you may need to modify it to work with the new schema. Serverpod provides a migration guide to help you with this process.

Q: Can I downgrade to Serverpod 2.4.0?

A: No, it is not recommended to downgrade to Serverpod 2.4.0. Downgrading may cause issues with your code and may not resolve the problem.

Q: What is the recommended approach for upgrading to Serverpod 2.6.0?

A: The recommended approach for upgrading to Serverpod 2.6.0 is to:

  1. Backup your code: Backup your code to ensure that you can revert to the previous version if needed.
  2. Regenerate the code: Regenerate the code using the Serverpod CLI.
  3. Test the code: Test the code to ensure that it works as expected.

Q: Can I get help with upgrading to Serverpod 2.6.0?

A: Yes, Serverpod provides several resources to help you with upgrading to Serverpod 2.6.0, including:

  • Documentation: Serverpod documentation provides a detailed guide on upgrading to Serverpod 2.6.0.
  • Community support: Serverpod community support provides a forum where you can ask questions and get help from other developers.
  • Professional support: Serverpod professional support provides paid support for upgrading to Serverpod 2.6.0.

Conclusion

In conclusion, the many-to-many models in Serverpod 2.6.0 are not backwards compatible with version 2.4.0. However, regenerating the code using the Serverpod CLI resolves the issue and allows the code to work as expected. We hope this Q&A article has provided valuable insights into issue and has helped users resolve the problem.

References