def save(self, *args, **kwargs): self.paid_fees = student.fee_set.aggregate(total_paid_fees=sum('paid_fees')) self.school_fees = first_record.school_fees self.remaining_fees = self.school_fees - self.paid_fees if self.remaining_fees == 0: super().save(*args, **kwargs) I have tried doing it like this, perhaps maybe you can see what I’m trying to do Sent from Mail From: coolguy
Sent: Monday, September 14, 2020 11:53 PM
To: Django users
Subject: Re: Help me with the view please not sure what are you looking for... but based on your model setup... school fees is setup once so we picked it up from first object/record from table, while paid fees are collected quarterly or whatever means there will be more than one transaction in fee table. We have already calculated the "paid_fees" from fee table like this >>> paid_fees = student.fee_set.aggregate(total_paid_fees=Sum('paid_fees')) I definitely want to help as long as i know what you are looking for :) On Monday, September 14, 2020 at 4:26:48 PM UTC-4 dex9...@gmail.com wrote: Thanks it has worked, but it doesn’t work with my total_paid_fees, I want to be automatically checked when school_fees substracts summation of all paid_fees, just like this solution you provided me with the last time first_record = student.fee_set.first() school_fees = first_record.school_fees paid_fees = student.fee_set.aggregate(total_paid_fees=Sum('paid_fees')) balance_fees = school_fees - paid_fees["total_paid_fees"] Sent from Mail for Windows 10 From: coolguy
Sent: Monday, September 14, 2020 9:09 PM
To: Django users
Subject: Re: Help me with the view please Its simple... in your fee models' save method check that self.remaining_fees is zero then make self.completed field to true... I added else clause in case if admin make changes to paid fees and after changes student still has some dues. def save(self, *args, **kwargs): self.remaining_fees = self.school_fees - self.paid_fees if self.remaining_fees == 0: super().save(*args, **kwargs) On Monday, September 14, 2020 at 7:11:51 AM UTC-4 dex9...@gmail.com wrote: Thank you brother @coolguy, I have put to work your latest solution and it has worked like a charm.I have been learning a lot from you lately, as you know i am still a beginner, i would love to learn one more thing from you..i have a boolean field "completed", and i want django to automatically check it when balance_fees or remaining_fees is equal to zero, Here is my model
Sent from Mail for Windows 10 From: coolguy
Sent: Friday, September 11, 2020 8:51 PM
To: Django users
Subject: Re: Help me with the view please Technically your Fee model is designed incorrectly. You should have separate models for 'fees' and 'fees_paid' where fee would have been the foreign key in 'fees_paid. Fee should have a property like annual fee etc for each student as fee may be different based on student discounts etc. Then when student pays the fees, fees should go in a separate transactional table i.e. 'fees paid'. In your scenario, does each row in fee table carries the annual/school fee? if so then yes summing them up will definitely cause incorrect figure. Here is what i would do if i don't change my models structure. def student_detail(request, pk): student = Student.objects.get(id=pk) # in your case pick the first record from fee_set first_record = student.fee_set.first() school_fees = first_record.school_fees paid_fees = student.fee_set.aggregate(total_paid_fees=Sum('paid_fees')) balance_fees = school_fees - paid_fees["total_paid_fees"] context = {"student": student, "school_fees": school_fees, "balance_fees": balance_fees, } return render(request, "student_details.html", context) <p>School fees: {{ school_fees }}</p> <p>Paid fees: {{ paid_fees.total_paid_fees }}</p> <p>Remaining fees: {{ balance_fees }}</p> Student name: student1 School fees: 100000.0 Paid fees: 35000.0 Remaining fees: 65000.0 On Friday, September 11, 2020 at 5:25:28 AM UTC-4 dex9...@gmail.com wrote: 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>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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