Sorry for bothering you @coolguy, you’re the only person who seems to be nice to a Django beginner developer like me, and I would like to bother you one more time Your solution for using methods in models is perfectly fine You see I want school_fees to be a fixed amount, example $300 So when a student pays more than once(student.fee_set), lets say this month student 1 pays $50 And another month pays $100 dollars, I want payments to added and subtracted from fixed schools_fees($300) Remainingfees to be $300 – (($50)+($100)) BUT what “ fees = student.fee_set.aggregate(total_paid_fees=Sum('paid_fees'), total_school_fees=Sum('school_fees'))” does is that it sums both paid fees school fees every time a student pays, I want only paid fees to added every time a student pays but not school fees ![]()
Sent from Mail for Windows 10 From: coolguy
Sent: Friday, September 11, 2020 4:27 AM
To: Django users
Subject: Re: Help me with the view please If i choose to go with your way of calculation, i would do this... def student_detail(request, pk): student = Student.objects.get(id=pk) fees = student.fee_set.aggregate(total_paid_fees=Sum('paid_fees'), total_school_fees=Sum('school_fees')) balance_fees = fees["total_school_fees"] - fees["total_paid_fees"] context = {"student": student, "fees": fees, "balance_fees": balance_fees, } return render(request, "student_details.html", context) <p>Student name: {{ student.name }}</p> <p>School fees: {{ fees.total_school_fees }}</p> <p>Paid fees: {{ fees.total_paid_fees }}</p> <p>Remaining fees: {{ balance_fees }}</p> Student Detail Student name: student1 School fees: 100000.0 Paid fees: 25000.0 Remaining fees: 75000.0 On Thursday, September 10, 2020 at 2:16:27 PM UTC-4 dex9...@gmail.com wrote: ![]()
Thanks for helping me @coolguy,but it seems I ran into another problem, the school fees and remaining fees somehow sums together, I want students to pay school fees in phases, i.e, first quarter, second etc, and I want remaining fee to be the difference between the initial school fees which is 1000000 and total fee paid. Thanks in advance My views.py for student ![]()
Sent from Mail for Windows 10 From: coolguy
Sent: Tuesday, September 8, 2020 11:58 PM
To: Django users
Subject: Re: Help me with the view please I see now what you are asking... I never do such calculations in views rather I create methods in models.py to do so and call them in the template... Like what you could do is.. class Student(models.Model): name = models.CharField(max_length=200, null=True, blank=True) classroom = models.ForeignKey(Classroom, _on_delete_=models.DO_NOTHING, blank=True, null=True) return sum(student.school_fees for student in self.fee_set.all()) def get_total_paid_fee(self): return sum(student.paid_fees for student in self.fee_set.all()) def get_remaining_fee(self): total_fee = self.get_total_fee() total_paid = self.get_total_paid_fee() return float(total_fee - total_paid) and in template you can call... {{ student.get_remaining_fee }} On Tuesday, September 8, 2020 at 1:35:56 PM UTC-4 dex9...@gmail.com wrote: Thank you for your help @coolguy..but my real problem lies in writing the code for “fee_remaining”, can you help me with that also..thanks Sent from Mail for Windows 10 From: coolguy
Sent: Tuesday, September 8, 2020 7:45 PM
To: Django users
Subject: Re: Help me with the view please In your return line of code, you are referring to context variable but I don't see you assigned any value to this context variable in your code. Or if you want to send three variables i.e. "fees", "total_fees" and "fee_remaining"... you need to send them separately like return render(request, 'website/students.html', {"fees": fees, "total_fees": total_fees, "fee_remaining": fee_remaining }) then use these variables on your students.html template. On Tuesday, September 8, 2020 at 12:21:21 PM UTC-4 dex9...@gmail.com wrote: My Models
class Student(models.Model):
name = models.CharField(max_length=200, null=True, blank=True)
classroom = models.ForeignKey(‘Classroom’,
_on_delete_=models.DO_NOTHING,blank=True, null=True)
class Classroom(models.Model):
name = models.CharField(max_length=40,blank=True, null=True) class Fee(models.Model):
student = models.ForeignKey(Student, _on_delete_=models.CASCADE, null=True,)
classroom = models.ForeignKey(Classroom, _on_delete_=models.CASCADE, null=True)
school_fees = models.FloatField(default=1000000)
paid_fees = models.FloatField(null=False)
remaining_fees = models.FloatField(blank=True)
completed = models.BooleanField(null=False, default=False) views.py
def student(request, pk):
student = Student.objects.get(id=pk) fees = student.fee_set.all().order_by('-publish_date') total_fees = student.fee_set.all().filter(student__id=pk) .aggregate(sum=Sum('paid_fees', flat=True)['sum'] fees_remaining = () return render(request, 'website/students.html', context)
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