9 | Django Signals like post save | by Hardik Patel

[@as00060]

I have seen many videos on Signal, but your one is the most closest to what I intend to achieve.

[@pratikrane149]

12:16 SimpleIsBetterThanComplex. That django guy rocks!

[@serdalaydogmus]

amazing explanation. thank you

[@abhishektripathi68]

Can you please explain little bit about foreign key relation

[@HardikPatelN]

Foreign key is storing multiple records for one record in other table. Parent Child - FK(parent I'd) Parent can have multiple children

[@vinodkumarkopperla2217]

when i try to get u.profile it showing that u object doesn't has profile attribute, anything wrong???

[@chip911]

This video tell exactly what i wamted to to but Can u please make a video on M2M key change eg what ids are added and what ids are removed from that M2M field, itll be great

[@chip911]

@@HardikPatelN im new at this so can u refer some thing that will help..

[@hrutujaranpise8482]

while saving : u.save(). am geting this error :IntegrityError: UNIQUE constraint failed: auth_user.username.........can you plz help me to fix it?

[@Magistrado1914]

Excellent course 02/10/2020

[@ashikurrahman8874]

i can't understand user=2 because user is one to one field and may be user = User().here are you assign user=User. id?

[@pratikrane149]

The user.id field automatically increments when the new user is created, therefore you don't have to explicitly enter value of user.id when registering user.

[@85brijesh]

Sir, Thank you for your video. I tried the code for foreign key instead of one-to-one field. Its working when any new object is created but while I am updating the object, its not working. Can you explain it in more detail. It will be very helpful for me. Thank you.

[@85brijesh]

@@HardikPatelN class PlatformFabCost(models.Model): facility = models.ForeignKey(PlatformTonnage,on_delete=models.CASCADE,null=True, blank=True) jacket_fab_cost = models.PositiveIntegerField(null=True, blank=True) def save(self, *args, **kwargs): self.jacket_fab_cost = int(0 if self.facility.jacket is None else self.facility.jacket) * (StrFabRate.objects.filter(active=True,structure_id = 1).values_list('fab_rate',flat=True))[0] @receiver(post_save, sender=PlatformTonnage) def create_platform_fab_cost(sender, instance, created, **kwargs): if created: PlatformFabCost.objects.create(facility=instance) else: instance.platformfabcost_set.all()

[@85brijesh]

@@HardikPatelN While updating jacket field in PlatformTonnage, jacket_fab_cost is not updating

[@85brijesh]

@@HardikPatelN Thank you sir.

[@azerabishov1369]

When i write "if created: Profile.objects.create(user=instance)" i get error such as "class Profile has no objects member". What is a problem?

[@azerabishov1369]

@@HardikPatelN ibb.co/YtKTp7r

[@firstnamelastname4685]

User object has no attribute profile. So, the line of code, else: instance.profile.save() has some problems Could you help me

[@firstnamelastname4685]

i know , i didn't get any problem creating a user, but when i want to access the admin page, this error pop out, But for one to one relationship, i do think User.profile should be working , because it is the feature of one to one, right? one to one automatically give both the User and Profile an additional attribute

[@firstnamelastname4685]

it is very clear , thank you sir

[@firstnamelastname4685]

may i kindly ask you one more question? Now i know how to extend the user. But I would like the user to fill in their additional information(designation, salary) in a different form after the sign up. How to do that?

[@abdull7804]

Hi Hardik, I am getting the error i.e UNIQUE constraint failed: auth_user.username, while giving that c=User(first_name="hardik") c.save()

[@abdull7804]

Ok, Thank you

[@vinaykakanuru]

Hey Aarav I have tried many times but when I'm saving u.first_name i am getting user has no attribute profile attribute error can you please help me how to resolve this error

[@vinaykakanuru]

Thank you Arav for quick reply. It is working now.

[@VivekKBangaru]

this video is hard to understand. can you please clarify it again with the new. I couldn't able to understand..

[@satyveersingh8026]

Sir Kuch video main apki awaaj clear nhi h

[@AnthonyPaulT]

Can’t understand shiet

[@arunsharma4709]

Ist

[@VivekKBangaru]

Not a list. **kwargs is the Dictionary(key value pair parameters to the function!)

[@manunegi5817]

*args is not list its tuple