Develop Reference

How to integrate python script in a django project

So I am extremely new to programming, and am stuck at this issue, I am using python with Django and Mongodb for database. I need to write a service that assigns an ID (not the one assigned by mongodb) upon each user form submission. for example entry 1's ID will be [Prefix entered by user] 2101, entry 2's ID will be [Prefix entered by user] 2102, so its basically adding in the number 2100.
I have no idea how and where to integrate this logic in my code. I have tried a few solutions on the internet but nothing seems to work.
my code:
Model.py
class Writeups(Document):
blog_id = 2100
title = fields.StringField(max_length=120)
date_created = fields.DateField(blank=True, null=True)
date_modified = fields.DateField(blank=True, null=True)
version_number = fields.DecimalField(null= True , max_digits=1000, decimal_places=2)
storage_path = fields.StringField(max_length=120)
STRIKE_READY_BRIEF = 'SRB'
STRIKE_READY_THREAT_REPORT = 'SRTR'
PREFIX_CHOICES = [
(STRIKE_READY_BRIEF, 'SRB'),
(STRIKE_READY_THREAT_REPORT, 'SRTR'),
]
prefix = fields.StringField(
max_length=4,
choices=PREFIX_CHOICES,
null=False,
blank=False,
)
views.py:
#csrf_exempt
def writeups_request(request):
"""
Writeup Request
"""
if request.method == 'GET':
try:
data = {
'form-TOTAL_FORMS': '1',
'form-INITIAL_FORMS': '0',
}
writeups = WriteupsFormset(data)
# print(writeup)
return render(request, "writeups/writeups.html", {'writeups_forms': writeups})
except Exception as e:
print(e)
response = {"error": "Error occurred"}
return JsonResponse(response, safe=False)
if request.method == 'POST':
writeup_data = WriteupsFormset(request.POST)
if writeup_data.is_valid():
flag = False
logs = []
for writeups_data in writeup_data:
print(writeups_data)
if writeups_data.cleaned_data.get('DELETE'): # and malware_data._should_delete_form(form):
continue
title = writeups_data.cleaned_data.get('title')
date_created = writeups_data.cleaned_data.get('date_created')
date_modified = writeups_data.cleaned_data.get('date_modified')
version_number = writeups_data.cleaned_data.get('version_number')
storage_path = writeups_data.cleaned_data.get('storage_path')
prefix = writeups_data.cleaned_data.get('prefix')
try:
writeups = Writeups(),
title=title,
date_created=date_created,
date_modified=date_modified,
version_number=version_number,
storage_path=storage_path,
prefix=prefix)
writeups.save()

In order to implement your custom script at all submissions, Django's Signals are the solution for your use case. Look into post_save and pre-save signals and use them as per your problem.
https://docs.djangoproject.com/en/3.2/ref/signals/
If you have an existing database and you want a script to iterate through it and update the dataset, you can take a look at Management Commands
https://docs.djangoproject.com/en/4.0/howto/custom-management-commands/

Djangos data cannot be imported into the database, is my code wrong?

I am new to Django, and I'd like to ask some questions
I used the model layer to create the model with fields in it,it can create user_id,movie_id field in the database.
class Rating(models.Model):
user_id = models.CharField(max_length=16)
movie_id = models.CharField(max_length=16)
rating = models.DecimalField(decimal_places=2, max_digits=4)
rating_timestamp = models.DateTimeField()
type = models.CharField(max_length=8, default='explicit')
def __str__(self):
return "user_id: {}, movie_id: {}, rating: {}, type: {}".format(self.user_id, self.movie_id, self.rating, self.type)
class Cluster(models.Model):
cluster_id = models.IntegerField()
user_id = models.IntegerField()
def __str__(self):
return "{} in {}".format(self.user_id, self.cluster_id)
Execute this statement using Python xxx.py,I want to populate the database but it doesn't work
import os
import urllib.request
import django
import datetime
import decimal
from tqdm import tqdm
os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'mysite.settings')
django.setup()
from analytics.models import Rating
def create_rating(user_id, content_id, rating, timestamp):
rating = Rating(
user_id=user_id, movie_id=content_id,
rating=decimal.Decimal(rating),
rating_timestamp=datetime.datetime.fromtimestamp(
float(timestamp)
)
)
rating.save()
return rating
def download_ratings():
URL = 'https://gitee.com/zhangyoushang/wokkk/blob/master/latest/ratings.dat'
response = urllib.request.urlopen(URL)
data = response.read()
print('download finished')
return data.decode('utf-8')
def delete_db():
print('truncate db')
Rating.objects.all().delete()
print('finished truncate db')
def populate():
delete_db()
ratings = download_ratings()
for rating in tqdm(ratings.split(sep="\n")):
r = rating.split(sep="::")
if len(r) == 4:
create_rating(r[0], r[1], r[2], r[3])
if __name__ == '__main__':
print("Starting MovieGeeks Population script..." )
populate()
But I found that my database was empty and there was no data in it.
No error is reported, execute as follows:

How to get Filename in DjangoWebApp based on a Model containing FileField?

I making a email delivery WebApp, I have an Email Class with uploadcsvfile to upload the .csv contact file from the user's computer to server at location CONTACT_DIR, what I'm unable to figure out is how to get the saved contacts_some_char.csv name in my views.py, the purpouse of getting it's name is so that I can parse the email list and send email to them.
I have my model.py as follows :
class Email(models.Model):
fromemail = models.EmailField(blank = False, max_length = 254)
uploadcsvfile = models.FileField(upload_to = 'Contacts', blank = False)
subject = models.CharField(blank=False,max_length = 254)
bodyHeading = models.CharField(blank = False,max_length = 254)
bodytext = models.TextField(blank = False)
name = models.CharField(blank = False,max_length = 254)
Here is my views.py :
def index(request):
if request.method == 'POST':
email_form = EmailForm(request.POST, request.FILES)
if email_form.is_valid():
email_form.save(commit = True)
print(Email.uploadcsvfile)
contacts = Contacts()
#path = settings.CONTACT_DIR
f = open(settings.CONTACT_DIR+"/"+str(uploaded_file_name))
csv_f = csv.reader(f)
Emails = []
Names= []
L_Names = []
for x in csv_f:
Emails.append(x[0])
Names.append(x[1])
L_Names.append(x[2])
f.close()
contacts.ListOfEmails = json.dumps(Emails)
contacts.ListOfFirstNames = json.dumps(Names)
contacts.ListOfLastNames = json.dumps(L_Names)
contacts.save()
Here is forms.py for the same :
from django import forms
from dcsvreader.models import Email
class EmailForm(forms.ModelForm):
class Meta():
model = Email
fields = "__all__"
A.K.A How do i get uploaded_file_name in views.py, I'm reading in various QnA at S.O that this is related to FileDescriptor but can't find how exactly also, print(Email.uploadcsvfile) gives <django.db.models.fields.files.FileDescriptor object at 0x03F7DF90> as output.

request.FILES is a dictionary-like object containing all uploaded files and the uploadcsvfile is the key in which you are making a POST request. Hence, request.FILES['uploadcsvfile'] will hold the particular file as InMemoryUploadedFile and it has a variable .name which holds the filename
Try this,
file_name = request.FILES['uploadcsvfile'].name
Reference
uploadfile.name
request.FILES

I'm pretty new to django myself but it looks like here:
print(Email.uploadcsvfile)
You're trying to print a class attribute rather than an attribute of an instance.
Have you tried the following?
print(email_form.uploadcsvfile.name)

TypeError: object is not JSON serializable in DJango 1.8 Python 3.4

I'm using DJango 1.8 and Python 3.4
When the below view is being ran, Django throws Type Error - Object is not JSON Serializable
Views.py
from django.http import HttpRequest,HttpResponse
from django.http import JsonResponse
from json import dumps
def get_stats(request):
if request.method == "POST":
srch_dropV = request.POST['srch_dropAJ']
else:
srch_dropV = ''
if(srch_dropV == 'Green'):
students = GreenBased.objects.all()
if(srch_dropV == 'Yellow'):
students = YellowBased.objects.all()
response_data = {}
try:
response_data['result'] = 'Success'
response_data['message'] = list(students)
except:
response_data['result'] = 'Ouch!'
response_data['message'] = 'Script has not ran correctly'
return HttpResponse(JsonResponse(response_data), content_type="application/json")
I'm trying to read couple of rows from mysql database and display it on the html file, I'm facing below error message when above view is being ran
TypeError: YellowBased: YelloBased object is not JSON serializable
In HTML Page, I have a drop down list.. based on the option that is selected, my Ajax would return me the records that were fetched from mysql table.
Models.py
class GreenBased(models.Model):
NumOfStudents = models.CharField(max_length=300,blank=True)
Green = models.CharField(max_length=300,blank=True)
class Meta:
managed = False
db_table = "GreenStats"
class YelloBased(models.Model):
NumOfStudents = models.CharField(max_length=300,blank=True)
Yellow = models.CharField(max_length=300,blank=True)
class Meta:
managed = False
db_table = "YellowStats"
GreenStats and YellowStats tables contains only 2*2 rows in mysql
Can someone please help me to identify this issue ?

You have to serialize your student objects list, try something like this:
from django.http import HttpRequest,HttpResponse
from django.http import JsonResponse
from json import dumps
from django.core import serializers
def get_stats(request):
if request.method == "POST":
srch_dropV = request.POST['srch_dropAJ']
else:
srch_dropV = ''
if(srch_dropV == 'Green'):
students = GreenBased.objects.all()
if(srch_dropV == 'Yellow'):
students = YellowBased.objects.all()
response_data = {}
try:
response_data['result'] = 'Success'
response_data['message'] = serializers.serialize('json', students)
except:
response_data['result'] = 'Ouch!'
response_data['message'] = 'Script has not ran correctly'
return JsonResponse(response_data)
Notice the line change in :
response_data['message'] = serializers.serialize('json', students)
Also JsonResponse does the trick on its own, so no need to wrap it in a HttpResponse.
check the docs for more customization:
https://docs.djangoproject.com/en/1.8/topics/serialization/
Hope this helps!

In Django 1.6.x how to get data of associated models in views?

After so much googling I did'nt found any relevant solution for getting the associated models data in views.
Things is I am requesting to the server via Ajax and want to fetch the folders and folder creator name(from User model). But it did'nt return me the first_name of the creator. Here's the code
models.py
class UserFolder(models.Model):
creator = models.ForeignKey(User)
name = models.CharField(blank=False, max_length=150)
is_shared = models.BooleanField(default=False)
created_date = models.DateTimeField(auto_now_add=True)
modified_date = models.DateTimeField(auto_now=True)
def __str__(self):
return self.name
views.py
def pagination(obj, request):
max = request.GET.get('max') if 'max' in request.GET else 1
paginator = Paginator(obj, max) # Show 25 contacts per page
page = request.GET.get('page')
try:
return paginator.page(page)
except PageNotAnInteger:
# If page is not an integer, deliver first page.
return paginator.page(1)
except EmptyPage:
return ""
def folder_list(request): #called via ajax
folders = UserFolder.objects.filter(creator=request.user.id).order_by('-modified_date')
folders = pagination(folders, request) #for pagination
folders = json.dumps({}) if not folders else serializers.serialize("json", folders)
return HttpResponse(folders)
I have tried .select_related('creator') too but it did'nt work.
In js I am fetching the data like this :
$.each(data, function(i, v) {
var t = fldrTpl, id = v.pk;
v = v.fields
t = t.replace(/\{(ID)\}/g, id);
t = t.replace(/\{(NAME)\}/g, v.name);
t = t.replace(/\{(C_SIZE)\}/g, (v.current_size == null?0:v.current_size));
t = t.replace(/\{(C_ID)\}/g, v.creator.first_name);
t = t.replace(/\{(C_DATE)\}/g, v.created_date);
$(".my-folder-table").append(t);
});
v.creator.first_name always return undefined.
Any help would be really appreciated.
Thanks

You can always create a dictionary of the data you want to use on your client side:
def folder_list(request): #called via ajax
folders_obj = UserFolder.objects.filter(creator=request.user).select_related('creator').order_by('-modified_date').all()
folders_dict = []
for folder in folders_obj:
d = {}
for k, v in folder.__dict__.items():
d[k] = str(v)
d["creator__first_name"] = folder.creator.first_name
folders_dict.append(d)
folders = pagination(folders_dict, request) #for pagination
folders = json.dumps({}) if not folders else serializers.serialize("json", folders)
return HttpResponse(folders)
And in your js:
t = t.replace(/\{(C_ID)\}/g, v.creator__first_name);