--
class Doctor(models.Model):
name = models.CharField(max_length=35)
username = models.CharField(max_length=15)
class DoctorProfilePic (models.Model):
name = models.CharField(max_length=255, blank=True)
pic = StdImageField(upload_to="data/media/%Y/%m/%d", blank=True, variations={
'large': (600, 400),
'thumbnail': (150, 140, True),
'medium': (300, 200),
})
doctor = models.OneToOneField(Doctor, blank=True,
null=True, on_delete=models.SET_NULL, related_name="profile_pic")
Setting on_delete to SET_NULL doesn't make much sense here, I think. This implies that if a doctor is deleted, the profile pic will be preserved, with the FK to doc being set to NULL in db (which doesn't seem desirable). I think here CASCADE should work good and will not have the issue that the OP is facing.--
…and after saying all that, I wouldn't make a separate model for the profile picture. This is what I would do:
class Doctor(models.Model):
name = models.CharField(max_length=35)
username = models.CharField(max_length=15)
profile_pic = StdImageField(upload_to="data/media/%Y/%m/%d", blank=True, variations={
'large': (600, 400),
'thumbnail': (150, 140, True),
'medium': (300, 200),
})
From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On Behalf Of Joel Mathew
Sent: Tuesday, November 27, 2018 12:24 PM
To: django-users@googlegroups.com
Subject: Unexpected behavior on delete of model
Situation:
I have two Model classes, in two different apps which are part of the same project. class doctor defined in appointments.models is a set of attributes associated with a doctor, like name, username, email, phone etc. class DoctorProfilePic is a Model defined in clinic.models, which has a StdImageField which stores images. doctor has a One to One mapping to DoctorProfilePic.
class doctor(models.Model):
docid = models.AutoField(primary_key=True, unique=True) # Need autoincrement, unique and primary
name = models.CharField(max_length=35)
username = models.CharField(max_length=15)
...
profilepic = models.ForeignKey(DoctorProfilePic, blank=True, null=True, on_delete=models.CASCADE)
...
class DoctorProfilePic (models.Model):
id = models.AutoField(primary_key=True, unique=True)
name = models.CharField(max_length=255, blank=True)
pic = StdImageField(upload_to="data/media/%Y/%m/%d", blank=True, variations={
'large': (600, 400),
'thumbnail': (150, 140, True),
'medium': (300, 200),
})
doc = models.ForeignKey('appointments.doctor', blank=True,
null=True, on_delete=models.CASCADE)
Anticipated response:
When user selects one of the profile pics from a selection box, and clicks Delete, django is supposed to delete the picture from the collection of pictures uploaded by the doctor.
Problem:
When the delete button is clicked, django deletes both the picture and the doctor, instead of just the former.
Code:
def removeprofpic(request, docid):
docid = int(docid)
if not IsOwnerorSuperUser(request, docid):
return HttpResponse("You dont have permissions to do this.")
doc = doctor.objects.get(docid = docid)
if request.method == 'POST':
print(request.POST)
picid = int(request.POST.get('profilepic'))
print(f'doc:{doc} picid:{picid}')
pic = DoctorProfilePic.objects.get(doc = doc, id =picid)
pic.delete()
msg = f"Successfully removed profile picture."
else:
msg = "Not a valid POST"
return HttpResponse(msg)
Now I'm guessing my problem is in defining the on_delete=models.CASCADE? Can someone explain what I've done wrong?
Sincerely yours,
Joel G Mathew
--
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