Model.update broken for many-to-many relations

[markerikson]

Model.update() checks to see if a given field to update is a many-to-many relation. If so, it tries to use a function called arrayDiffActions() to determine which IDs have been added or removed from the existing list. It's trying to import that function from utils.js, but the function no longer exists. Looks like it was removed in commit 560c81d on May 9, while working on adding use of the immutable ops lib.

As a result, Model.update() currently breaks due to the undefined function reference.

[tommikaikkonen]

Sorry for the delay here -- was on a trip for a couple of weeks.

Looks like I didn't have a test in place to catch that regression. Wrote test to catch regression and fixed it in 72daf37, will make a new release later today.

[markerikson]

Sure. In the meantime, I wrote a utility function for myself that does fairly similar behavior.

[carlesnunez]

Can u give me more info about that?

I am trying to update a model with a many relationship and im getting with that error:
Possible Unhandled Promise Rejection (id: 0):
Tried to add already existing XXX id(s)

[carlesnunez]

Self response:

If we go to the file Model.js we can see in the line 425

if (idsToAdd.length > 0) {

That is causing a bug on the update of an empty many relationship array. Is not deleting any relationship but instead is adding links to relationships. That is causing a problem on the update process throwing the error that I pasted before

We can avoid that changing the line to that:

if (idsToAdd.length > 0 && currentIds.length > 0)