Develop Reference

Django Form processing files

So I have the following code:
# the view
class UpdateDateView(LoginRequiredMixin, UpdateView):
model = Date
form_class = DateForm
template_name = 'app/form/date_edit_form.html'
def save_photos(self, date) -> None:
photos = self.request.FILES.getlist('photo')
current_photos = self.request.FILES.getlist('custom-photo-name') # this is not working
for photo in photos:
Photo.objects.create(date=date, photo=photo)
def form_valid(self, form):
date = form.save()
self.save_photos(date)
return super().form_valid(form)
# the form
class DateForm(forms.ModelForm):
photo = forms.ImageField(required=False)
class Meta:
model = Date
exclude = ('user',)
# the Edit form
<form action="{% url 'app:edit-date' date.slug %}" method="post" enctype="multipart/form-data">{% csrf_token %}
<div class="form-container">
...
<tr>
<th><label for="id_photo">Image:</label></th>
<td>
<input type="file" name="photo" accept="image/*" id="id_photo" multiple>
</td>
</tr>
<div class="current-photos">
{% for photo in date.photos.all %}
<div class="photo-wrapper-{{ forloop.counter }}">
<img src="{{ photo.photo.url }}" width="200px"><a class="delete-photo" id="{{ forloop.counter }}">Delete</a>
<input type="file" name="custom-photo-name" value="{{ photo }}" class="hide" id="photo_{{ forloop.counter }}">
</div>
{% endfor %}
</div>
</div>
<div class="buttons">
<input type="submit" value="Save" class="create-button redirection no_decoration">
Back
</div>
</form>
# js (jquery)
$('.delete-photo').on('click', function() {
const id = $(this).attr('id');
const div_class = `.photo-wrapper-${id}`;
$(div_class).remove()
});
I have a CreateView and UpdateView. The ImageField is not required, it is optional.
Let's assume I have created a new date with photos. Then I wanted to edit its pictures (delete some and add some new). When I click on tag (Delete), the div wrapper for that photo is being removed. When I try to save my edits, I want to access 2 different lists with photos (ones which were added in the past, and the new photos).
This self.request.FILES.getlist('custom-photo-name') seems to do nothing with current photos. Please help, maybe my code logic is bad in general? What I am missing here? What html form looks for when I submit the form, whether for the tag or maybe name attribute? Huge thanks in advance!

Transferring user input from one page to another

I am making a website that allows students to find upcoming study sessions for their courses. I am doing this in Django and HTML. A student uploads their courses to the site and they are shown on the courses page as buttons (ex. CS 101 - Intro to CS). When a student clicks on one of their courses (button), it is supposed to bring them to a page that shows available study sessions for that course. I am stuck because I do not know how to properly filter the available study sessions on the next page based on which course is clicked. Is there a way to store the info of the course as a variable so when the button is clicked I can use that variable to filter the results? EDIT: I have made these changes and now I am getting a ValueError too many values to unpack expected 2. I am almost certain it is happening in my views.
Here is the page that shows a user's courses:
<div class="container h-100" style="top:50%; bottom:50%; width:100%;">
<div class="row">
{% if courses_list %}
{% for course in courses_list %}
<a type="button" class="btn btn-outline-secondary" href="{% url 'study:course-session'%}" >{{ course.subject }} {{ course.number}}-{{course.name}} </a>
<br><br><br>
{% endfor %}
{% else %}
<p class="text-center">You have not added any courses yet!</p>
{% endif %}
</div>
</div>
And here is the page that I am trying to filter the list of study sessions (which have a field course that is a ForeignKey to the Courses model):
<h1><center>Upcoming Study Sessions</center></h1>
<div>
<a class="btn btn-success" style="position:absolute; margin-right:2px; top:15%; right:0;" href="{% url 'study:courses' %}" role="button" >Back to My Courses</a>
</div>
<br><br>
<div class="container h-100" style="top:50%; bottom:50%; width:100%;">
<div class="row">
<button type="button" class="btn btn-outline-secondary" >Date/Time: {{ session.date }} <br> Location: {{ session.location }} </button>
<br><br><br>
</div>
</div>
View for the template:
def CourseSessionView(request, course_pk):
course_wanted = Course.objects.get(id=course_pk)
try:
return Study.objects.filter(course=course_wanted)
except:
return messages.error(request, 'There are no upcoming study sessions at this time for the requested course.')
Model for course and session:
class Course(models.Model):
SUBJECT_CHOICES = [
('AAS', 'AAS')
]
subject = models.CharField(
max_length=4, choices=SUBJECT_CHOICES, default='')
number = models.PositiveSmallIntegerField(
validators=[MaxValueValidator(9999)], default=0)
name = models.CharField(max_length=100, default='')
roster = models.ManyToManyField(
Student, blank=True, related_name="courses")
# Use [Student object].courses.all() to see all of a student's courses
def __str__(self):
return f"{self.subject} {self.number} - {self.name}"
class Study(models.Model):
organizer = models.ForeignKey(Student, on_delete=models.CASCADE)
date = models.DateTimeField()
# Use [Student object].studies.all() to see all of a student's study sessions
attendees = models.ManyToManyField(Student, related_name="studies")
location = models.CharField(max_length=30)
course = models.ForeignKey(Course, on_delete=models.CASCADE)
def __str__(self):
return f"{self.date} - {self.location}"
Url:
path('<int:course_pk>/sessions/',
views.CourseSessionView, name='course-session')

Note: The function based views' name doesn't require to be in PascalCase as in your case, it should be in snake_case.
The page that show the user's courses, there you need to pk of courses:
<div class="container h-100" style="top:50%; bottom:50%; width:100%;">
<div class="row">
{% if courses_list %}
{% for course in courses_list %}
<a type="button" class="btn btn-outline-secondary" href="{% url 'study:course-session' course.pk %}" >{{ course.subject }} {{ course.number}}-{{course.name}} </a>
<br><br><br>
{% endfor %}
{% else %}
<p class="text-center">You have not added any courses yet!</p>
{% endif %}
</div>
</div>
Your view for the template, i am defining it in snake_case, since its recommended way.
def course_session(request, course_pk):
course_wanted = Course.objects.get(id=course_pk)
study_courses=''
try:
study_courses= Study.objects.filter(course=course_wanted)
except:
messages.error(request, 'There are no upcoming study sessions at this time for the requested course.')
else:
return render(request,'anyfolder/anyfile.html',{'study_courses':study_courses})
return render(request,'anyfolder/anyfile.html') #then it will show only your error message.
Your url in urls.py be like:
path('any_route_name/<int:course_pk>/', views.course_session, name='course_session')
Note: Never forget to pass / at the end of your url or route_name.
Then, in your any template file you can access it and run loop:
{% for study in study_courses %}
{{study.organizer}},{{study.date}}
{% endfor %}
Then, you can access all its properties, and take benefit of ManyToOne relation.

This is going to be a very general type of answer since you are not providing your models or your views, but I think the idea would be the following.
First, in your template you can pass a parameter for the course number in the url:
your_template.html
<a class="btn btn-outline-secondary"
href="{% url 'study:course-session' course.pk %}">
{{ course.subject }} {{ course.number}}-{{course.name}}
</a>
Then in your view you can access that value, and from it get the course:
views.py
def the_view_name(request, course_pk):
# Here you now have access to the course's primary key, pk, so you can get the
# course and filter the study sessions by that course, etc...
You will need to modify the urls.py so the view can accept this new parameter:
urls.py
path('the_view_name/<int:course_pk>', views.the_view_name, name='the_view_name'),
EDIT
Make the following changes:
First to your views.py:
def CourseSessionView(request, course_pk):
try:
course_wanted = Course.objects.get(id=course_pk)
except:
return messages.error(request, 'course not found')
study_sessions = Study.objects.filter(course=course_wanted)
if study_sessions.count() < 1:
return messages.error(request, 'There are no upcoming study sessions at this time for the requested course')
context = {
'study_sessions': study_sessions,
}
return render(request, 'study/your_template_file.html', context)
Then in your html
<h1><center>Upcoming Study Sessions</center></h1>
<div>
<a class="btn btn-success" style="position:absolute; margin-right:2px; top:15%; right:0;" href="{% url 'study:courses' %}" role="button" >Back to My Courses</a>
</div>
<br><br>
<div class="container h-100" style="top:50%; bottom:50%; width:100%;">
{% for session in study_sessions %}
<div class="row">
<button type="button" class="btn btn-outline-secondary" >Date/Time: {{ session.date }} <br> Location: {{ session.location }} </button>
<br><br><br>
</div>
{% endfor %}
</div>

crispy_forms.exceptions.CrispyError: |as_crispy_field got passed an invalid or inexistent field - models.ForeignKey

I'm trying to create a frontend data entry page for an existing model. However, when clicking the link, I get an error:
crispy_forms.exceptions.CrispyError: |as_crispy_field got passed an invalid or inexistent field
Just to be clear, adding the data from Django Admin works with no issues at all.
Having looked through a number of answered questions here, one did highlight what I believe could be problem, but it was out of context and did not provide much of an explanation.
I am trying to create a frontend entry form for users that corresponds with a foreign key.
models.py
class NewHandoff(models.Model):
handoff_pk = models.AutoField(primary_key=True)
handoff_date = models.DateField(auto_now_add=True,verbose_name="Handoff Date")
shift1_pri = models.ForeignKey(Engineer,on_delete=models.CASCADE,verbose_name="Shift 1 Primary")
shift1_sec = models.ForeignKey(Engineer,on_delete=models.CASCADE,verbose_name="Shift 1 Secondary")
def __str__(self):
return f"{self.handoff_date}"
class Meta:
verbose_name_plural = 'Handoffs'
# New Handoff Form
class NewHandoffForm(forms.ModelForm):
class Meta:
model = NewHandoff
fields = ['shift1_pri','shift1_sec']
views.py
from django.shortcuts import redirect, render
from django.views import View
from django.contrib.auth.mixins import LoginRequiredMixin
from django.http.response import HttpResponse
from django.contrib import messages
from .models import AttentionForm, NewHandoffForm
# Handoff View Page
class NewHandoffView(LoginRequiredMixin,View):
def get(self, request):
greeting = {}
greeting['heading'] = "New Handoff"
greeting['pageview'] = "Handoff"
return render (request,'handoff/handoff-new.html')
def post(self, request):
if request.method == "POST":
if "add-new-handoff-button" in request.POST:
create_new_handoff_form = NewHandoffForm(request.POST)
create_new_handoff_form.save()
return redirect("/handoff/handoff-create")
handoff-new.html
{% extends 'partials/base.html' %}
{% load static %}
{% load humanize %}
{% load crispy_forms_tags %}
{% block extra_css %}
<link href="{% static 'libs/bootstrap-datepicker/dist/css/bootstrap-datepicker.min.css' %}" rel="stylesheet">
{% endblock %}
{% block contents %}
<div class="row">
<div class="col-12">
<div class="card">
<div class="card-body">
<!-- New Form -->
<form method="POST">
{% csrf_token %}
<div class="row">
<div class="row-fluid pb-1">
<!-- Field 1 -->
<div class="mb-3">
{{ form.shift1_pri|as_crispy_field }}
</div>
<!-- End of Field 1 -->
</div>
</div>
<div class="d-flex flex-wrap gap-2">
<button type="submit" class="btn btn-primary waves-effect waves-light" name="add-new-handoff-button">Create New Handoff</button>
</div>
</form>
<!-- End of New Form -->
</div>
</div>
</div>
</div>
{% endblock %}
{% block extra_javascript %}
{% endblock %}
Someone mentioned in another post that forms should correlate with the declared form name {{ form.shift1_mod|as_crispy_field }} so it should actually be {{ create_new_handoff_form.shift1_mod|as_crispy_field }} but I have tried changing this and still get the same problem, plus, another model form works fine with just form despite the name of the form being attention_form.
Does anyone have any idea or can point me in the right direction? :)

You are not passing the form through the context in the template. As you are inheriting View, Add the following line in the get() and afterwards in the post() method appropriately:
form = NewHandoffForm()
# and then change return
return render(request,'handoff/handoff-new.html', {'form': form })
Also, you have a space after render in the get function. I hope this is a typo here, but not in your code.

Adding "search" while keeping pagination and sorting?

I wanted to add the "search" functionality to my model, but the [querystring][1] doesn't seem to work as I expected it to. Here's my attempt:
from django.db import models
class ProductsByOneDayMax(models.Model):
product = models.TextField(max_length=65535, verbose_name="Product name")
max = models.IntegerField(verbose_name="Max daily IPs")
class Meta:
db_table = 'precomputed_product_distinct_ip_one_day_max'
from django.db import connection as conn
from django.shortcuts import render
from viewer.models import ProductsByOneDayMax
import django_tables2 as tables
def list_products(request):
class ProductsByOneDayMaxTable(tables.Table):
class Meta:
model = ProductsByOneDayMax
exclude = ('id', )
search = request.GET.get('search', '')
objects = ProductsByOneDayMax.objects.filter(product__icontains=search)
table = ProductsByOneDayMaxTable(objects)
table.order_by = "-max"
tables.RequestConfig(request).configure(table)
return render(request, "plain_table.html", {'table': table,
'title': 'Product list',
'search': search})
And the view:
{% extends "base.html" %}
{% block content %}
{% load django_tables2 %}
{% querystring "search"=search %}
<form class="form-inline" method="get" role="form">
<div class="input-group">
<span class="input-group-addon"><span class="glyphicon glyphicon-search"></span></span>
<input type="text" class="form-control " value="" placeholder="Search..." name="search">
</div>
<button type="submit" class="btn btn-primary">Search</button>
</form>
{% render_table table %}
{% endblock %}
Instead of adding the "search" field to the querystring, this only gets added to the output. What am I doing wrong?
In case it's relevant, I am using bootstrap-tables2.css.

Looks like this was solved in the last GitHub comment for the linked template:
The bootstrap_pagination tag needs the full URL in order to properly
sort columns between pages:
{% bootstrap_pagination table.page url=request.get_full_path %}
This
assumes you have "django.core.context_processors.request" in
settings.TEMPLATE_CONTEXT_PROCESSORS
Modifying the template solved the problem.

Django Filter Error

I want to save and filter users objects in my django app. After inputting the below codes, the imagefield keeps giving me a validation error, saying:
This field is required.
It’s pointing to the imagefield that I should fill it. How can I get rid of that error and make it filter?
Models
class Fin(models.Model):
user=models.ForeignKey(User)
title=models.CharField(max_length=250)
main_view=models.ImageField(upload_to="photos")
side_view=models.ImageField(upload_to="photos")
address=models.CharField(max_length=200)
city=models.CharField(max_length=200)
state=models.CharField(max_length=200)
guideline=models.TextField(max_length=1000)
def __unicode__(self):
return self.title
def get_absolute_url(self):
return self.title
class FinForm(ModelForm):
class Meta:
model=Fin
fields=('title','main_view','side_view', 'address','city','state','guideline')
exclude=('user')
Views
def fincrib(request):
extra_data_context={}
#if there's nothing in the field do nothing.
if request. method=="POST":
form =FinForm(request.POST)
if form.is_valid():
data=form.cleaned_data
newfincribs=Fin(
user= request.user,
title=data['title'],
main_view=Fin.objects.latest['main_view'],
side_view=Fin.objects.latest['side_view'],
address=data['address'],
city=data['city'],
state=data['state'],
guideline=data['guideline'])
newfincribs.save()
extra_data_context.update({'FinForm':form})
else:
form = FinForm()
extra_data_context.update({'FinForm':form})
extra_data_context.update({'Fins':Fin.objects.filter(user=request.user)})
plan=Fin.objects.filter(user=request.user)
paginator=Paginator(plan, 5)
try:
page=request.GET.get('page', '1')
except ValueError:
page=1
try:
Fins=paginator.page(page)
except (EmptyPage, InvalidPage):
Fins=paginator.page(paginator.num_pages)
extra_data_context.update({'Fins': Fins})
return render_to_response('post.html',extra_data_context,context_instance=RequestContext(request))
Template
{% block content %}
<form action="." method="POST">
{% csrf_token %}
<center> {{FinForm.as_p}} </center>
<input type="submit" value="Submit"/>
</form>
{% for Fin in Fins.object_list %}
<tr>
{{Fin.user}} </p> </strong>
<p>{{Fin.title}}</p>
<p><img src="{{MEDIA_URL}}/{{Fin.main_view}}"/></p>
<p> <img src="{{MEDIA_URL}}/{{Fin.side_view}}"/></p>
<p> {{Fin.address}} </p>
<p> {{Fin.city}}</p>
<p> {{Fin.state}}</p>
<p> {{Fin.guideline}}</p>
{% endfor %}
<div class="pagination">
<span class="step-links">
{% if Fins.has_previous %}
previous
{% endif %}
<span class="current">
Page {{ Fins.number }} of {{ Fins.paginator.num_pages }}
</span>
{% if Fins.has_next %}
next
{% endif %}
</span>
</div>
{% endblock %}

It's because by default all model fields are required, it means if you want to create and save new model instance in the database, you should fill all the mandatory fields. Maybe
main_view=Fin.objects.latest['main_view'],
side_view=Fin.objects.latest['side_view'],
is giving you the error, because there is no data.

change
main_view=models.ImageField(upload_to="photos")
side_view=models.ImageField(upload_to="photos")
to
main_view=models.ImageField(upload_to="photos", blank=True, null=True)
side_view=models.ImageField(upload_to="photos", blank=True, null=True)
btw, im not sure which django version you're using but your code is rather messy, any reason you're not using CBVs and static tags?