Branch merge failure on many-to-many assignments

[jeremystretch]

Plugin Version

v0.2.0

NetBox Version

v4.1-dev

Python Version

3.10

Steps to Reproduce

1. Create & activate a branch
2. Edit an existing interface and assign one or more VLANs
3. Attempt to merge the branch

Expected Behavior

The branch should be merged successfully.

Observed Behavior

The merge job fails with the following error:

TypeError('Direct assignment to the forward side of a many-to-many set is prohibited. Use tagged_vlans.set() instead.')

Private Preview Participant Links

Bloomberg: https://netdev-community.slack.com/archives/C07CP24P6AX/p1721395501733989

[linear]

BRA-7 Branch merge failure on many-to-many assignments

Plugin Version

v0.2.0

NetBox Version

v4.1-dev

Python Version

3.10

Steps to Reproduce

1. Create & activate a branch
2. Edit an existing interface and assign one or more VLANs
3. Attempt to merge the branch

Expected Behavior

The branch should be merged successfully.

Observed Behavior

The merge job fails with the following error:

TypeError('Direct assignment to the forward side of a many-to-many set is prohibited. Use tagged_vlans.set() instead.')

[jeremystretch]

AFAICT this only occurs when changing both an M2M field and some other type of field on the object; changing either alone works as expected. My guess at this point is that it has to do with calling save() on the object after modifying M2M relationships, but I'm not sure why. Still digging into this.