AttributeError type object Chat has no attribute objects

This error occurs when you try to access the objects attribute on a model class that does not have a default manager defined.

To fix this error, you need to define a default manager for your Chat model. You can do this by adding the following code to your model:

class Chat(models.Model):
    # your model fields here
    
    objects = models.Manager()  # define default manager
    
    # your model methods here

By defining a default manager, you can now access the objects attribute on your Chat model without getting the AttributeError exception.