How to resolve circular dependency error in django models

Question

I have 2 apps in my django project

customer app
trades app

Customer app has following tables in models.py

customer_table
trade_plan_table
service_plan_table
customer_payments

trades app has following table in models.py

trade_details_table
service_details_table

Below are my dependencies:

service_plan_table has foreign key ref to service_details_table
customer_payments has foreign key ref to customer_table, trade_plan_table, service_plan_table
trade_details_table has foreign key ref to customer_table
service_details_table has foreign key ref to customer_table

Since there is dependency from customer model to trades model and vice versa, I'm facing circular dependency error. Instead of importing I tried 'string reference' but it did not help.

how to solve this issue?

please post the stack trace of the error?

Abhyudai
– Abhyudai

2025-02-27 05:43:13 +00:00
Commented Feb 27 at 5:43 — Abhyudai
– Abhyudai, Commented Feb 27 at 5:43

twrought · Accepted Answer · 2025-03-09 19:55:06Z

0

Without seeing the models themselves, I'm guessing that you probably just need to lazy reference (https://docs.djangoproject.com/en/5.1/ref/models/fields/#lazy-relationships) via strings the models that the fk fields point to rather than importing the model and using the class directly:

class TradeDetail(models.Model):
    customer = models.ForeignKey('customers.Customer', on_delete=models.CASCADE)

instead of

from customers.models import Customer

class TradeDetail(models.Model):
    customer = models.ForeignKey(Customer, on_delete=models.CASCADE)

answered Mar 9 at 19:55

twrought

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