Hello there i was trying to migrate my database from SQLite to PostgreSQL 
following the docs steps but it seems that i encountered a problem wich i 
can't resolve.

I have a base model called Producto wich has no dependencies.

I have another model called Preaprobado that has the following field:

    productos = models.ManyToManyField(Producto, related_name = 
"preaprobados", default = Producto.objects.get(CMS_id = 1))


The thing is that in order for the app to work i need one mandatory Product 
with CMS_id field = 1.

I managed to dumpdata from every model separatedly succesfully, then i 
changed the DB config in settings.py and was able to run the migrate 
command succesfully.

The problem is that when i try to loaddata InitialProducts.json the console 
returns an error displaying that the query 
Producto.objects.get(CMS_id = 1)
has no value.

I tried disabling the signals as it says in the loaddata docs 
<https://docs.djangoproject.com/es/2.2/ref/django-admin/#loaddata> but 
honestly i don't know where should i add the code disabling the signals 
since the error is raised when defining the models.py

Any help is more than welcomed.

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