[Breaking change]: Removed migrations from 8.00 to 9.Latest

[bergmania]

Description

The old migrations used to migrate from Umbraco 7 to Umbraco 8 and further to Umbraco 9 have been removed from Umbraco 11.

PR that makes the change: N/A

Version

Umbraco 11.0.0-rc1

Previous behaviour

Migration classes could be inherited and overridden.

New behaviour

Migration classes cannot be inherited and overridden.

Type of breaking change

• Binary incompatible: Existing binaries may encounter a breaking change in behaviour, such as failure to load/execute or different run-time behaviour.

• Source incompatible: Source code may encounter a breaking change in behaviour when targeting the new runtime/component/SDK, such as compile errors or different run-time behaviour.

• Behavioral change: Existing code and binaries may experience different run-time behaviour.

Reason for change

The only migration path expected to work is to update one major at a time. There are other existing code removed earlier that limits the possibility to migrate the data multiple major versions in one go.

Recommended action

If you inherit from the removed classes, it is recommended to copy the code into your own solution.

Affected APIs

N/A

[benmccallum]

It seems like this is also the case from 10 --> 11, as we're on 9 and had to run up 10.4 before 11.

Unfortunately there's no real upgrade guides for 11, from 9 or 10 for that matter.