保存 Django Model 表单并在选择外键后刷新 Object

Question

I have the following models:

class Pic(models.Model):
    name = models.CharField(max_length=50)
    img = ImageField(upload_to='images/', default=None, null=True, blank=True)

class InputTest(models.Model):
    pic_id = models.ForeignKey(Pic, on_delete=models.CASCADE)
    image_field_crop = CropperImageField(upload_to='images/', default=None, null=True, blank=True)

When adding a new InputTest object, the admin selects a PicID Object (foreign key) from the existing ones. I want right after selecting it, the object to save and refresh.

For example:

• When adding a new InputTest object, I select PIC#1 as foreign key. The program will run this overwritted method:

   def save(self, force_insert=False, force_update=False, using=None, update_fields=None): super(InputTest, self).save(force_insert, force_update, using, update_fields) self.image_field_crop = self.pic_id.img super(InputTest, self).save(force_insert, force_update, using, update_fields)

• Then when the pages refreshes, the image_field_crop is auto-completed with the PIC#1.img and I can use it in CropperJS (using CropperImageField)

Is it possible to do this? To auto-save the object and refresh the page right after selecting the pic_id when adding a new InputTest.

Answer 1

Hi you can use below save method in InputTest model after you select a pic_id in InputTest admin and select save button image_field_crop filed filled automatically

def save(self, *args, **kwargs):
        self.image_field_crop = self.pic_id.img
        super(InputTest, self).save(*args, **kwargs)

I hope it helps you