When creating an entry through my controller, I want to be able to add relationships through a relation manager. I'm getting a constraint violation that's being thrown by the relation manager, stating that my foreign key can't be null. This is absolutely true of course, but there must be an (automated) way to postpone the create action of the relation manager.

I know why it's failing, but what I want to know how to get around it. I've read up about deferred bindings and that looks like the thing I need, but I can't figure out how to implement it in such a way that I don't have to write the create actions myself.

Is this possible or am I being lazy?

I just started having this issue too. Started getting integrity constraint violations when creating child relationships. In my case, the parent model is already created. When attempting to save a child, it throws an error. Not really sure why -haven't messed with the relationships in the models lately and the configuration loads the correct form fields for the child.

I believe this has something to do with it:

https://github.com/octobercms/october/commit/af657e9399e3ac74ed70a0b35089b24e07cf56e9

It seems to be fixed in developer branches https://github.com/octobercms/october/commit/c30b34e4d94560a7590104dbce20cabac7262285

Still having this issue on latest system build.