python - How to update Django model fields in MySQL database

Question

I created a model for posts in Django and I'm trying to update one of the fields in the database (MySQL). I have the following block of code: model.py

class Post (models.Model):
    title = models.CharField()
    preamble = models.CharField()
    body = models.TextField ()
createdAt = models.DateTimeField(auto_now_add=True, blank=True)

I want to add another field called author author=models.ForeignKey(User, on_delete=models.CASCADE Also, I want to change the name of one of the fields from preamble to introduction

Whenever I run the command python manage.py makemigrations and then python manage.py migrate, I get an error which terminates the migration process. it's telling me that the field preamble which I have in my database is not recognized. Is it possible to update preamble to introduction?

Answer 1

• Ensure you have a migration of the initial state of your app, before any modifications.
• Rename the preamble field to introduction in your model, making no other changes.
• Run makemigrations. It should ask you whether it was a rename.
• Add the author foreign key.
• Run makemigrations. It should ask you for a default for the user field if it's not nullable; 1 should hopefully refer to the first user created in your system.
• Run migrate.