I have a model having image and reference field (reference is a string value). I need to filter the images list by reference, and a reference can have multiple images.

Now I'm wishing a dropdown menu having reference field values. How can I do that.

Here is the model

class AllImg(models.Model):
    ref_by = models.CharField(max_length=100)
    img_name = models.ImageField(upload_to='uploads/allimg/')

now in my view of showing the list of AllImg model i have to filter them by ref_by field. I'll set the value of the ref_by in session and show the list according to that value. And if nothing is set in that session key, all entries of AllImg model will be shown.