How i can change my query to work in django? - django

Question

I want to make a request from two tables at once, I registered dependencies in the class. But the request does not work for me. What is wrong with him?
views.py
def payments(request):
paymentsss = Transaction.objects.select_related("currency_id")[:5]
return render(request, "payments.html", {"paymentsss": paymentsss})
models.py
class Transaction(models.Model):
id = models.BigIntegerField(blank=True, null=False, primary_key=True)
currency_id = models.ForeignKey(Currency, null=True, on_delete=models.CASCADE)
deal_id = models.ForeignKey(Deal, null=True, related_name='deal', on_delete=models.CASCADE)
service_instance_id = models.ForeignKey(ServiceInstance, null=True, related_name='service_instance', on_delete=models.CASCADE)
payment_source_id = models.ForeignKey(PayerPaymentSource, null=True, related_name='payment_source', on_delete=models.CASCADE)
payment_date = models.DateTimeField(blank=True, null=True)
amount = models.IntegerField(blank=True, null=True)
status = models.CharField(max_length=255, blank=True, null=True)
context = models.TextField(blank=True, null=True) # This field type is a guess.
class Meta:
managed = False
db_table = '"processing"."transaction"'`enter code here`
And Currency for example:
class Currency(models.Model):
id = models.SmallIntegerField(blank=True, null=False, primary_key=True)
name = models.CharField(max_length=128, blank=True, null=True)
iso_name = models.CharField(max_length=3, blank=True, null=True)
minor_unit = models.SmallIntegerField(blank=True, null=True)
class Meta:
managed = False
db_table = '"processing"."currency"'
My Error:
I would be glad if there is an example of how to make a larger request. From 3-4 tables.

Answer 1

Change the db_table
class Meta:
managed = False
db_table = 'processing.transaction'
class Meta:
managed = False
db_table = 'processing.currency'

Answer 2

You need to change the column names for the foreign keys: e.g. currency = ForeignKey(...) and deal = ForeignKey(...).
The field is a reference to the object itself, not to the id of the object. You can see that behind the scenes, Django queries using currency_id_id which doesn't make sense.
If your column name is currency_id (in your database), then your field name should be currency.