Django: How can I changes values via views.py - django

Question

I am trying to make a "upload" page so that I can upload a file and process to postgres DB using pd.to_sql(). All the data has been succefuly recorded into DB, but cannot change the values of "is_recorded" and "has_issue". Here is the files I am working on so far.
In upload/models.py
from django.db import models
class Upload(models.Model):
file_name = models.FileField(upload_to='uploads', max_length=255)
uploaded = models.DateTimeField(auto_now_add=True)
# When uploaded successfully
is_recorded = models.BooleanField(default=False)
# When it has a problem to fix
has_issue = models.BooleanField(default=False)
def __str__(self):
return f'{self.file_name}: {self.id}'
In views.py
import os
from django.shortcuts import render
from core.db_implements import upload_csv_to_DB
from upload.forms import UploadForm
from upload.models import Upload
def upload_view(request):
error_message = None
success_message = None
form = UploadForm(request.POST or None, request.FILES or None)
if form.is_valid():
form.save()
form = UploadForm()
try:
obj = Upload.objects.get(is_recorded=False)
recorded, issue, success_message, error_message = ***upload_csv_to_DB***(obj)
obj.is_recorded = recorded
obj.has_issue = issue
obj.save()
success_message = success_message
error_message = error_message
except:
error_message = 'Something went wrong.'
context={
'form': form,
'success_message': success_message,
'error_message': error_message,
}
return render(request, 'upload/upload.html', context)
In forms.py
from django import forms
from django.db.models import fields
from django.forms.fields import FileField
from django.forms.models import ModelFormMetaclass
from .models import Upload
class UploadForm(forms.ModelForm):
# file_name = forms.FileField(max_length=255, label=False)
class Meta:
model=Upload
fields = ('file_name',)
widgets = {
'file_name': forms.FileInput(
attrs={
'class': 'form-control',
}
)
}
I am outsource the function (upload_csv_to_DB) which takes file object and convert to dataframe and record into DB. If its success, recorded=True with sucess_message supposed to be returned, however, if somethings wrong, issue=True with error_message supposed to be returned. Anyways recorded and issue are always False, and having error_message from except clause 'Something went wrong.'. Please advise me...

Answer 1

I figured out the reason. I did not initialize the return value of outsourced function, upload_csv_to_DB. After initialize the returned values to be, everything works as intended. Here is the code which solves the problem.
In upload_csv_to_DB.py:
def upload_csv_to_DB(csv_obj):
recorded = False
issue = False
success_message = None
error_message = None
upload_file = csv_obj.file_name.path
...
return (recorded, issue, success_message, error_message)
In views.py:
def upload_view(request):
error_message = None
success_message = None
recorded =False
issue = False
if request.method == 'POST':
form = UploadForm(request.POST, request.FILES)
if form.is_valid():
form.save()
try:
obj = Upload.objects.get(is_recorded=False)
recorded, issue, success_message, error_message = upload_csv_to_DB(obj)
obj.is_recorded = recorded
obj.has_issue = issue
obj.save()
success_message = success_message
error_message = error_message
except:
error_message = 'Something went wrong.'
else:
form = UploadForm()
context={
'form': form,
'success_message': success_message,
'error_message': error_message,
}
return render(request, 'upload/upload.html', context)