Django foreignkey between two databases - django

Question

I'm looking to connect two SQLite tables together (oh dear).
I found this solution : How to use django models with foreign keys in different DBs? , I adapted it to my models and my code (I think). I have no bad answers from django. However, I would like to modify the entry with the admin view of django, and when I try to add the entry with the foreign key of another database, I get this answer:
Exception Type: OperationalError at /admin/users/character/add/
Exception Value: no such table: books
How to adapt to fix it?
models database default
from django.db import models
from users.related import SpanningForeignKey
from books.models import Books
class Character(models.Model):
last_name = models.fields.CharField(max_length=100)
first_name = models.fields.CharField(max_length=100)
book = SpanningForeignKey('books.Books', null=True, on_delete=models.SET_NULL)
def __str__(self):
return f'{self.first_name} {self.last_name}'
models external database
from django.db import models
# Create your models here.
class Books(models.Model):
title = models.TextField()
sort = models.TextField(blank=True, null=True)
timestamp = models.TextField(blank=True, null=True) # This field type is a guess.
pubdate = models.TextField(blank=True, null=True) # This field type is a guess.
series_index = models.FloatField()
author_sort = models.TextField(blank=True, null=True)
isbn = models.TextField(blank=True, null=True)
lccn = models.TextField(blank=True, null=True)
path = models.TextField()
flags = models.IntegerField()
uuid = models.TextField(blank=True, null=True)
has_cover = models.BooleanField(blank=True, null=True)
last_modified = models.TextField() # This field type is a guess.
class Meta:
managed = False
db_table = 'books'
app_label = 'books'
class Languages(models.Model):
lang_code = models.TextField()
class Meta:
managed = False
db_table = 'languages'
app_label = 'books'
class BooksLanguagesLink(models.Model):
book = models.ForeignKey(Books, null=True, on_delete=models.SET_NULL, db_column='book')
lang_code = models.ForeignKey(Languages, null=True, on_delete=models.SET_NULL, db_column='lang_code')
item_order = models.IntegerField()
class Meta:
managed = False
db_table = 'books_languages_link'
app_label = 'books'
admin books
from django.contrib import admin
from books.models import Books, Languages
class BooksModelAdmin(admin.ModelAdmin):
using = 'calibre_db'
def save_model(self, request, obj, form, change):
obj.save(using=self.using)
def delete_model(self, request, obj):
obj.delete(using=self.using)
def get_queryset(self, request):
return super().get_queryset(request).using(self.using)
def formfield_for_foreignkey(self, db_field, request, **kwargs):
return super().formfield_for_foreignkey(db_field, request, using=self.using, **kwargs)
def formfield_for_manytomany(self, db_field, request, **kwargs):
return super().formfield_for_manytomany(db_field, request, using=self.using, **kwargs)
# Register your models here.
admin.site.register(Books, BooksModelAdmin)