Django Custom Primary Key Tries to insert Null - django

Question

There are some constraints to this problem. We currently use a production database, with live Virtual Machine Statistics. We are trying to create a django interface, that interfaces with the tables we want our administrators to be able to edit. Thus, migrations are out of the question, for unless I have come to understand migrations wrong it will affect the current database structure and or data.
I matched the database structure exactly in my models.py file. However I have run into a few issues. One of the issues I have run into is when I try to add a new item under the admin control panel it will give me an integrity error as it is attempting to insert a null value for the field I have set as the primary key in the models.py file.
We are currently using an oracle database.
My Models.py not all of it but a sample of it.
class License(models.Model):
license_id = models.AutoField(primary_key = True, editable = False, db_column='license_id')
license_authority_id = models.ForeignKey(License_authoritie, on_delete = models.PROTECT, db_column='license_authority_id')
product = models.CharField(max_length = 20)
class Meta:
managed = False
db_table = 'licenses'
ordering = ['product']
def __unicode__(self): # Python 3: def __str__(self):
return self.product
class Vm_license(models.Model):
vm_license_id = models.AutoField(primary_key = True, db_column='vm_license_id')
vm_id = models.ForeignKey(Vm, on_delete = models.PROTECT, db_column='vm_id')
license = models.ManyToManyField(License)
class Meta:
managed = False
db_table = 'vm_licenses'
The error I get:
Request Method: POST
Request URL: http://127.0.0.1:8000/admin/portal/vm_license/add/
Django Version: 1.6.5
Exception Type: IntegrityError
Exception Value:
ORA-01400: cannot insert NULL into ("DEV"."VM_LICENSES"."VM_LICENSE_ID")
On top of that I have run into another problem.
For these two tables, under the vm_licenses section in the admin panel which is a table that holds all VM's and their assigned licenses. I need the ability to select multiple licenses at a time for each vm_id under the add section of the admin panel but i'm not quite sure how to do this.
admin.py code
class vm_license_admin(admin.ModelAdmin):
#list_display = ('vm_id', 'license_id')
list_display = ('vm_id',)
search_fields = ('vm_id__vm_name',)
ordering = ('vm_id',)
filter_horizontal = ('license',)
admin.site.register(Vm_license, vm_license_admin)
I also made an oracle trigger to auto increment a primary key if there is none, but im still getting the same error.
CREATE OR REPLACE TRIGGER license_trigger
BEFORE INSERT ON vm_licenses
FOR EACH ROW
BEGIN
SELECT vm_license_seq.nextval
INTO :new.vm_license_id
FROM dual;
END;
to be more percise I am using a manytomany field and it displays correctly when I goto add a new item before clicking save and getting the null error, however if I goto an existing item it will say table or view doesnt exist.

Answer 1

I was going to comment on your question, but I do not have the reputation yet...
but can I suggest you post your relevant admin.py code? Perhaps there is something within it relating to the Null PK error.
With regards to the second part, a ManyToManyField sounds more suitable.