You can do this easily by creating creating an object of that model from which you want to get the value or input a value by using 'get_object_or_404' or 'get_list_or_404' by importing from django.shortucts. Reas about these two functions and difference between them in documentation.
Use them, for eg :- derive = get_object_or_404(ModelChild1, ModelDad=request.user) #object created of model ModelChild1 access = derive.number #will give the value of number that has been input by user On Fri, 25 Jan 2019, 17:29 NAveeN Kumar Reddy <knaveenkumarredd...@gmail.com wrote: > You can use this where you want you to link tables with foreign key > > models.ForeignKey(Model_Name,on_delete=models.CASCADE) > > That's it both tables will be in relation after migration of models into > database > > > > On Fri, Jan 25, 2019 at 12:20 PM Mike Dewhirst <mi...@dewhirst.com.au> > wrote: > >> On 24/01/2019 5:28 pm, carlos wrote: >> > Hello, >> > I do not know if I'm asking the question correctly, but I need to call >> > a field of one model in another model >> > example: >> > class ModelDad(models.Model): >> > name = blablabla >> > >> > class ModelChild1(....): >> > fk(ModelDad) >> > number = models.IntegerField() >> > >> > class ModelChild2(....): >> > fk(ModelDad) >> > another_number = models.IntegerField() >> > >> > def make_proces(self): >> > return self.another_number * ModelChild1.number #this is my >> question >> > >> > how can I send a call number within the function (make_proces ) of >> > ModelChild2 >> >> You need a mechanism to find ModelChild1 and the Django ORM provides >> Queries for exactly that. >> >> There is a default model manager called 'objects' which you can use to >> find instances of models. By that I mean you can pinpoint a row in the >> database table which that model represents. For example ... (but to make >> it clearer I'll adjust your models above slightly) >> >> class ModelDad(models.Model): >> name = blablabla >> >> class ModelChild1(models.Model): >> dad = models.ForeignKey(ModelDad) >> number = models.IntegerField() >> >> class ModelChild2(models.Model): >> dad = models.ForeignKey(ModelDad) >> another_number = models.IntegerField() >> >> def make_proces(self): >> child1 = ModelChild1.objects.get(dad=self.dad) >> return self.another_number *child1.number >> >> Visit Django documentation https://docs.djangoproject.com and scroll >> down past "First steps" to "The model layer" and click on a link in the >> "Quersets" line. The answers will be in there. >> >> > >> > is posible???? >> > >> > >> > >> > -- >> > att. >> > Carlos Rocha >> > -- >> > You received this message because you are subscribed to the Google >> > Groups "Django users" group. >> > To unsubscribe from this group and stop receiving emails from it, send >> > an email to django-users+unsubscr...@googlegroups.com >> > <mailto:django-users+unsubscr...@googlegroups.com>. >> > To post to this group, send email to django-users@googlegroups.com >> > <mailto:django-users@googlegroups.com>. >> > Visit this group at https://groups.google.com/group/django-users. >> > To view this discussion on the web visit >> > >> https://groups.google.com/d/msgid/django-users/CAM-7rO125r3pox%3D137GOfmjnmFaf3cekaNj-j%2B9A0Cwc%3DEM0Fg%40mail.gmail.com >> > < >> https://groups.google.com/d/msgid/django-users/CAM-7rO125r3pox%3D137GOfmjnmFaf3cekaNj-j%2B9A0Cwc%3DEM0Fg%40mail.gmail.com?utm_medium=email&utm_source=footer >> >. >> > For more options, visit https://groups.google.com/d/optout. >> >> -- >> You received this message because you are subscribed to the Google Groups >> "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to django-users+unsubscr...@googlegroups.com. >> To post to this group, send email to django-users@googlegroups.com. >> Visit this group at https://groups.google.com/group/django-users. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/django-users/522c40aa-2736-3f57-b23b-9c283c9a59e0%40dewhirst.com.au >> . >> For more options, visit https://groups.google.com/d/optout. >> > > > -- > Naveen Kumar Reddy > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to django-users+unsubscr...@googlegroups.com. > To post to this group, send email to django-users@googlegroups.com. > Visit this group at https://groups.google.com/group/django-users. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/CA%2BC2Q82%2Bp47A92koj2%3Djq4aOvFetD%2BEuSikSCSbofTeSxWz-8Q%40mail.gmail.com > <https://groups.google.com/d/msgid/django-users/CA%2BC2Q82%2Bp47A92koj2%3Djq4aOvFetD%2BEuSikSCSbofTeSxWz-8Q%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Django users" group. 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