Why is the prettus repository package shit at handling mass inserts. The documentation says:

$this->repository->create(Input::all())

WTF does that even mean.

Make sure that you have $fillable property in model that your repository inherits

that is the first the comes in my mind, can you describe you problem further?

i think if you didn't override create() method in your repository or model it will do the same as eloquents create()

https://laravel.com/docs/5.8/...

I’ve got the field that’s retiring out in the table, but the error coming back is coming back as “join_id does not have a default value” but going through the array of rows to insert, it’s got a value assigned to it.

I’ve not overwritten the create method, but going through the model works. I don’t want to do that as it’s bypassing the cache

damn, that is inconsistent, you can try with laravel telescope, and see exact query that is going on, see if you have "join_id" in insert query...
you were right, if Model::create(Input::all()) works but this doesn't it's definitively problem with packages mass assignment