Saving many-to-many fields from the excel file in Django - django

Question

I'm trying to save the student data from an excel file. I'm reading the excel file row-wise and mapping the data to the model fields. Now the problem is that there is a foreign key and a many-to-many field which I don't know how to save. Though I figured out the foreign key part but not able to solve the second part.
Here are the files.
views.py
def fileUpload(request):
if request.method=="POST":
form= UserDataUploadView(request.POST, request.FILES)
try:
excel_file= request.FILES["excel_file"]
except MultiValueDictKeyError: # In case the user uploads nothing
return redirect('failure_page')
# Checking the extension of the file
if str(excel_file).endswith('.xls'):
data= xls_get(excel_file, column_limit=10)
elif str(excel_file).endswith('.xlsx'):
data= xlsx_get(excel_file, column_limit=10)
else:
return redirect('failure_page')
studentData= data["Sheet1"]
print("Real Data", studentData)
# reading the sheet row-wise
a_list= studentData
list_iterator= iter(a_list)
next(list_iterator)
for detail in list_iterator:
# To find out empty cells
for data in detail:
if data==" ":
print('A field is empty')
return redirect('user_upload')
print("DATA: ", detail)
user=User.objects.create(
firstName = detail[6],
lastName = detail[7],
password = detail[8],
username = detail[9],
)
# instance=user.save(commit=false)
# Student.batch.add(detail[0])
student=Student.objects.create(
user = user,
email = detail[1],
rs_id = detail[2],
dob = detail[3],
address = detail[4],
age = detail[5],
)
student.save()
return render(request, 'classroom/admin/success_page.html', {'excel_data':studentData})
# iterating over the rows and
# getting value from each cell in row
# for row in worksheet.iter_rows():
# row_data= list()
# for cell in row:
# row_data.append(str(cell.value))
# excel_data.append(row_data)
# return render(request, 'classroom/admin/excel.html', {'excel_data':excel_data})
else:
form=UserDataUploadView()
return render(request, 'classroom/admin/fill_users.html', {
'form':form,
# 'excel_data':excel_data,
})
models.py
class Subject(models.Model):
school = models.CharField(max_length=50, null=True)
name = models.CharField(max_length=30)
color = models.CharField(max_length=7, default='#007bff')
def __str__(self):
return self.name
def get_html_badge(self):
name = escape(self.name)
color = escape(self.color)
html = '<span class="badge badge-primary" style="background-color: %s">%s</span>' % (color, name)
return mark_safe(html)
class Batch(models.Model):
name = models.CharField(max_length=30, unique=True)
school = models.CharField(max_length=50)
amount_of_fees = models.IntegerField(null=True)
subjects = models.ManyToManyField(Subject)
#property
def students(self):
return self.student_set.all()
def __str__(self):
return self.name
class Student(models.Model):
user = models.OneToOneField(User, on_delete=models.CASCADE, primary_key=True, default=None)
batch = models.ManyToManyField(Batch)
email = models.EmailField(null=True)
phone_number = models.CharField(max_length=10, null=True)
dob = models.DateField(blank=True, null=True, help_text="Enter in the following format : YYYY-MM-DD")
address = models.TextField(max_length=150, null=True)
age = models.IntegerField(blank=True)
image = models.ImageField(upload_to='profile_pictures', default='student_image.png', blank=True)
rs_id = models.IntegerField(blank=True,default=0)
I don't know how to put the data for batch in the excel sheet. Kindly give insight for that too.

Answer 1

Assuming detail[0] is the name field for the Batch model, you would do:
student_batch = Batch.objects.get(name=detail[0])
student=Student.objects.create(
user = user,
email = detail[1],
rs_id = detail[2],
dob = detail[3],
address = detail[4],
age = detail[5],
)
student.batch.add(student_batch)
student.save()
You will also need to update your Batch field on the Student model to:
batch = models.ManyToManyField(Batch, blank=True)