Wednesday, September 23, 2020

RE: Help me with the view please

I cant seem to put together this template for adding fee, for roll#, tuition fee and remaining fee, I have managed only to create the form, can you help me with that

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From: coolguy
Sent: Tuesday, September 22, 2020 6:10 PM
To: Django users
Subject: Re: Help me with the view please

 

how about following outputs... 

On Tuesday, September 22, 2020 at 4:44:45 AM UTC-4 dex9...@gmail.com wrote:

Thanks for your previous tips, and I have already created the get_absolute_url for my DetailView and It is working just fine

    def get_absolute_url(self):

        return reverse("student_detail", kwargs={"pk": self.pk})

I think now I can learn from you how use views to generate my output

 

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From: coolguy
Sent: Tuesday, September 22, 2020 4:32 AM
To: Django users
Subject: Re: Help me with the view please

 

I have made some changes to the model.py and now methods/functions are properties(@property). It's of personal preference and you will find programmers prefer properties and functions for their own understanding.    google it you will see...

 

Since these functions are not doing big calculations with no parameter/argument and are very basic so we can use property instead. 

 

What you need to do is.. wherever you called the method with () brackets... remove them like example below...

 

fee = self.student.get_remaining_fee()

to

fee = self.student.get_remaining_fee

 

There is one get_absolute_url method that you can use to reverse to student_detail view (if you have create one). We can later talk about how you are using views to generate your output...

On Monday, September 21, 2020 at 2:58:14 PM UTC-4 dex9...@gmail.com wrote:

Hi @coolguy, thanks for your attachments,  have created all the views and templates, and I have been working on them for my new web app, for this new models will it be easy for more implement or auto check paid all checkbox all payments have been completed, please, how?

 

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From: coolguy
Sent: Thursday, September 17, 2020 6:26 AM
To: Django users
Subject: Re: Help me with the view please

 

If you are using sqllite3 then make a copy of it and delete the existing sqllite3 file from your project. Keep the old file as you may need it.

 

Here are project files... i quickly make them but these are working..

 

 

 

 

On Wednesday, September 16, 2020 at 3:57:22 PM UTC-4 dex9...@gmail.com wrote:

Since model design is where I very much struggle, and I think  my fee management system models are not well design, so I need your help in redesigning my models please

 

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From: coolguy
Sent: Wednesday, September 16, 2020 5:31 PM
To: Django users
Subject: Re: Help me with the view please

 

There are a lot of courses but those are very basic and keep on talking about same thing that you might have learned before... even after taking courses you will have to think yourself how to structure your tables....

 

I would suggest don't start any big project rather start with a simple Student, Payment and Class models. Keep master information in your Student and class models and all transaction in Payment model.

 

I can help you in designing the models.

 

Let me know...

 

On Wednesday, September 16, 2020 at 12:43:06 AM UTC-4 dex9...@gmail.com wrote:

Thanks for your valuable information, it seems my models are not well constructed, I will first work on them.

Don't you have a YouTube channel or website or paid course somewhere like Udemy where I can learn more

 

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From: coolguy
Sent: Tuesday, September 15, 2020 10:57 PM
To: Django users
Subject: Re: Help me with the view please

 

Isn't this 'paid_fee' used to record the quarterly/monthly payments from students? and this field will have multiple records? 

 

It seems you are looking to save an accumulated paid_fee (total_paid_fees) somewhere in table. 

If i am corrected then... this type of structure is okay when you are working on spreadsheet solution e.g. microsoft excel, and save/calculate the result in a separate column for the user info but when we deal with the database and UI solution we don't use this approach... rather we show such calculation on template. We persist initial setup values like student name, school_fees etc and the recurring transactions in database.

 

If you really want to save this type of information in your database you get to change your database structure and create a parent and child relationship between Fee (being parent) and Student_Payments (being child). 'Fee' would have all setup information as well as calculated fields like total_fees, total_paid_fees, remaining_fees etc. 'Student_payments' would only carry number of payments over the periods. When you have this structure ready then you can think of maintaining totals in parent table per student.

 

anyways, to your question following line would not work in save() method

>>> self.paid_fees = student.fee_set.aggregate(total_paid_fees=sum('paid_fees'))  

 

since you don't have 

>>> student = Student.objects.get(id=pk)

 

even if you want to save then which record in the table would you update... so logically its wrong.

 

On Tuesday, September 15, 2020 at 2:04:57 AM UTC-4 dex9...@gmail.com wrote:

    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:

            self.completed = True

        else:

            self.completed = False

            

        super().save(*args, **kwargs)

I have tried doing it like this, perhaps maybe you can see what I'm trying to do

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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"] 

 

 

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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:

            self.completed = True

        else:

            self.completed = False

            

        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

 my template

 

 

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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.

 

views.py

=======

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,

               "paid_fees": paid_fees,

               "school_fees": school_fees,

               "balance_fees": balance_fees, }

 

    return render(request, "student_details.html", context)

 

template

=======

<body>

    <h1>Student Detail</h1>

    <p>Student name: {{ student.name }}</p>

    <p>School fees: {{ school_fees }}</p>

    <p>Paid fees: {{ paid_fees.total_paid_fees }}</p>

    <p>Remaining fees: {{ balance_fees }}</p>

</body>

 

Output:

================

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

 

 

 

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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)

 

Template e.g.

<body>

    <h1>Student Detail</h1>

    <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>

</body>

 

Result:

Student Detail

Student name: student1

School fees: 100000.0

Paid fees: 25000.0

Remaining fees: 75000.0

I hope this helps!

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

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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)

 

    def __str__(self):

        return self.name

 

    def get_total_fee(self):

        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

 

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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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