Hi, I'm having a really incomprehensible error currently. We are working 
with three models here, "DataImport", "Contact" and "Dataset", the 
DataImport model import data from a file to a Dataset object, the data is 
imported as a Contact object , the DataImport model have a foreign key to 
the Dataset model. This is how the app works:

- a user upload a file
- we convert the content of the file to a TablibDataset or TablibDatabook, 
these are tablib (python package) classes, don't worry too much about this, 
tablib have their own Dataset and I have my own, that's why I import the 
tablib classes with aliases
- if the loaded data is a TablibDataset, the import start and create 
contacts from the loaded data (this works)
- if the loaded_data is a TablibDatabook, the databook is split into 
multiple sheet (yes I'm working with excel files) and new Dataset (my 
model)  and DataImport objects are created to handle the import for each  
sheet (here is the issue)

All import are done as async task using the django_q package
The issue I have is that, when I create a new dataset, start the import and 
try to add a new contact I get this:
```
insert or update on table "datasets_contact" violates foreign key 
constraint "datasets_contact_dataset_id_9dda7f76_fk_datasets_dataset_id"
DETAIL:  Key (dataset_id)=(39) is not present in table "datasets_dataset".
```
It seems like the dataset is not save in db that's why I'm getting this 
error when I try to create a new contact, but I'm creating my Dataset 
object with Dataset.objects.create(), I don't understand the problem.

The code for all this is a bit long, so here is a gist with all the 
necessary code 
https://gist.github.com/Tobi-De/411ee7b7fc988864869c8d7ad93ab34f

The method that create the Dataset and DataImpot objects is the class 
method "create_import_from_databook"

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