[Answered ]-Storing likes and follows informations in different models gives me error: most likely due to a circular import

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Your Product model needs to import the User model and vice versa. As a result the imports got stuck in an infinite loop.

You can however use a string literal to specify to what model your ManyToManyField is pointing. For example:

# no import of the models module where you define User

class Product(models.Model):
    #here are information fields about Product

    likes = models.ManyToManyField(
        'app_name.User', related_name="product_likes", blank=True
    )
    # ⋮

Here app_name is the name of the app where you defined the (custom) user model.

Since it is (likely) the user model, you here can use the AUTH_USER_MODEL setting [Django-doc]:

# no import of the models module where you define User
from django.conf import settings

class Product(models.Model):
    #here are information fields about Product

    likes = models.ManyToManyField(
        settings.AUTH_USER_MODEL, related_name="product_likes", blank=True
    )
    # ⋮
👤willeM_ Van Onsem

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