Django: String format using class field

Question

I want to upload photos to different directories. The directory name should have a title from a model class field. I tried this:

image = models.ImageField(upload_to=f"image/posts/{title}")

It created this:

I wanted to see the post's title where I get <django.db.models.fields.CharField>.

How can I get the text from this field. To set the text, I used the Django admin panel.

models.py

class Post(models.Model):
    # ...
    title = models.CharField(max_length=250)
    image = models.ImageField(upload_to=f"image/posts/{title}")

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For clarification: In my image field, I set the upload address. This address is different for every post. One directory per post. The directory name should be the value of the title field.

Answer 1

In order to get the value of title for the instance of Post to which you are uploading the image, upload_to needs to be a callable. That callable will receive the instance as an argument and you can then get the title.

Something like this:

def post_image_path(instance, filename):
    title = instance.title
    return f"image/posts/{title}/{filename}"

class Post(models.Model):
    # ...
    title = models.CharField(max_length=250)
    image = models.ImageField(upload_to=post_image_path)