Django community: Django Q&A RSS
This page, updated regularly, aggregates Django Q&A from the Django community.
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Passing data from React form to Django
I am running a Django server with the frontend based on Reactjs (Ant Design specifically). However, I faced a problem when I was trying to pass the data from a React form to the Django backend: the data never made it through. Please assume that all the {whatever_url} in this file is already defined. The headers are also ignored as there are no import errors. auth_login.js function getCookie(name) { // As there are no permission errors so far, the contents in // this function is ignored. Please ask for it if anyone // needs it for any purpose. } class NormalLoginForm extends React.Component { constructor(props) { super(props); this.state = {username: '', password: ''}; this.handleUsernameChange = this.handleUsernameChange.bind(this); this.handlePasswordChange = this.handlePasswordChange.bind(this); this.handleSubmit = this.handleSubmit.bind(this); } handleUsernameChange(event) { this.setState({username: event.target.value}); } handlePasswordChange(event) { this.setState({password: event.target.value}); } handleSubmit(event) { console.log(this.state.username); // Output see below (1) console.log(this.state.password); let csrftoken = getCookie('csrftoken'); fetch('/account/login', { credentials: 'include', method: 'POST', headers: { 'Content-Type': 'application/json', 'X-CSRFToken': csrftoken, }, body: { "username": this.state.username, "password": this.state.password } }) .then((response) => {console.log('message: ', response);}) // Output see below (2) .catch((error) => {console.error('Error:', error);}); } render () { return ( // I am able to successfully retrieve the data (see output below) from … -
Change admin form field with a custom one
I got a Category model class Category(models.Model): name = models.CharField(max_length=120,default='', verbose_name=_('name')) color = ColorField(default='#FF0000') and a Product model class Product(models.Model): name = models.CharField(max_length=120) category = models.ForeignKey(Category, on_delete=models.CASCADE, default=None) ... In the Product admin page, I want to make the category drop-down to show the name with the category's color. With help from this question: Django form field choices, adding an attribute I manage to make a colored category field in my admin page: This is the code (added to product/admin.py): class SelectWOA(Select): def create_option(self, name, value, label, selected, index, subindex=None, attrs=None): option_dict = super(SelectWOA, self).create_option(name, value, label, selected, index, subindex=subindex, attrs=attrs) #Category.objects. try: option_dict['attrs']['style'] = 'color: ' + Category.objects.get(name=label).color + ';' except: pass return option_dict from django.forms import ChoiceField, ModelChoiceField from category.models import Category class ProductAdminForm(ModelForm): test_field = ModelChoiceField(queryset=Category.objects.all(), widget=SelectWOA()) class Meta: model = Product exclude = ['category'] fields = ('name', 'image', 'image2', 'category', 'test_field',) from django.db import models class ProductCastumAdmin(admin.ModelAdmin): form = ProductAdminForm but the test_field does not know I want it to "connect" to the category field and replace it. So when I save the form, the data I put inside test field is not saved as the category. My question is after I excluded the category field, … -
gunicorn_start failing No module Found
Hi guys Im having some trouble deploying in Ubuntu VPS. I have in / directory a dir called webapps and inside my folder "EntornoCursoDjango" that is my virtual environment. Inside this folder I have my dir project "ProyectoEmpleados". When running gunicorn_start file I have this error: This is my gunicorn_start file: -
Django Elastic Beanstalk Secret Variables
I want to secure my secret variables for my django project, which is deployed on AWS Elastic Beanstalk. I've seen others use environment variables and am wondering if this is secure. Or, is it more secure to use KMS? Thanks! -
NoReverseMatch at /polls/2/
Django version: 3.0.8 Python version: 3.8.0 I'm doing a Django tutorial and I ran into this error below "detail.html" below {% extends 'polls/base.html' %} {% block main_content %} <h1>{{question.question_text}}</h1> {% if error_message %}<p><strong>{{error_message}}</strong></p>{% endif %} <form action ="{% url 'polls:vote' question.id %}" method="post"> {% csrf_token %} {% for choice in question.choice_set.all %} <input type="radio" name = "choice" id="choice{{forloop.counter}}" value="{{choice.id}}"/> <label for="choice{{forloop.counter}}">{{choice.choice_text}}</label><br> {% endfor %} <input type="submit" value="vote"/> </form> {% endblock %} "base.html" below <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Base</title> </head> <body> <hr> <p> Header </p> <hr> {% block main_content %} {% endblock %} {% include "polls/footer.html" %} </body> </html> If anyone can help with this, I would appreciate it. -
Using Django's prefetch_related on complex queries
I have the following basic query in my APIView: categories = UserCategorizationType.objects.all() In the serializer, I have setup eager loading for all foreign keys and one-to-many relationships as well. However, now I need to setup eager lading for a field that is added by the serializer of UserCategorizationType. Basically, for each result in categories, I want to append a field called "possibleValues". I do this in my serializer like so: class UserCategorizationTypeWithApprovedValuesSerialiser(BaseSerializer): possibleValues = serializers.SerializerMethodField() def get_possibleValues(self, categorizationType_): #-- get all approved values and user's own values values = UserCategorizationValue.objects.filter( Q(categorizationType=categorizationType_) & ( Q(categorizations__in=UserCategorization.objects.filter(author=self.__userProfile)) | Q(state="APPROVED") ) ).distinct() serializer = UserCategorizationValueSerializerValueOnly(values, many=True) return serializer.data My question is how do I use prefetch_related for this sort of query? I want this query to ideally stay in the serializer because there are multiple views that obtain categories and I want to encapsulate the way possibleValues are added into a category. -
On Heroku, redirect doesn't work even though it works on localhost
I developed Django web service and deploy to Heroku. However, redirect doesn't work only on Heroku.The code is following(for people who came for the first time): def index(request): if not ('user_id' in request.COOKIES): return redirect('main:getting_started') This should redirects https://remind-archives.herokuapp.com/main/ to https://remind-archives.herokuapp.com/main/getting_started but 404 error happens. What could be the cause? -
Django: the command 'py manage.py runserver' isn't showing any output
the command py manage.py runserver isn't showing any output and as far as I could tell isn't opening a server either. I couldn't even get passed the first tutorial in the official django docs. C:\Users\sruls\OneDrive\Desktop\the big fat coding folder\django\django_learn> py manage.py runserver C:\Users\sruls\OneDrive\Desktop\the big fat coding folder\django\django_learn> I have tried reinstalling Django and it didn't help -
Restricting/limiting number of times a model.foreignkey choice can be chosen in python django (fantasy sports website)
I am in the process of making a fantasy sports website. The django out-of-the-box User equals a team owner. On my blog/models.py file, I created a class of Player (aka an NBA player) with a foreignkey field of player_owner pointing back to User: # blog/models.py class Player(models.Model): player_full = models.CharField(max_length=50) player_owner = models.ForeignKey(User, blank=True, null=True, on_delete=models.SET_NULL) image = models.ImageField(default='default_player.jpg', upload_to='player_pics') player_unit_value = models.PositiveSmallIntegerField(default=1, validators=[MinValueValidator(1), MaxValueValidator(1)]) As you can see, I also have a field on the Player class called player_unit_value set permanently to 1. This, i think, will come into play with my question. I have a lot of the website set up: Free Agents Page, Team Dashboard, Player Profile, financials etc all built out with form validation to ensure players are "signed" and "dropped" by the authorized signed-in User (aka team owner). # blog/views.py class PlayersUpdateView(LoginRequiredMixin, UpdateView, Player): model = Player fields = [] template_name = 'blog/player_form.html' # <app>/<model>_<viewtype>.html context_object_name = 'guys' def form_valid(self, form): form.instance.player_owner = self.request.user return super().form_valid(form) Thus, when you click "add player" on my site, that player's player_owner field is updated from "None" to the User. and the "Drop Player" button does the reverse. So here is my question: How can I create a logic … -
Django modeltranslation for AJAX request
I have installed the Django modeltranslation package and almost everything works fine... The only thing that doesn't are the AJAX requests, whose JsonResponses are still coming back in the original language. I couldn't find in the docs how to fix it. I'm using the 'django.middleware.locale.LocaleMiddleware' middleware, so the LANGUAGE_CODE selection should be based on data from the request (i.e. the user's browser settings). Apparently, AJAX requests are not getting the memo. Is there a way to let the server knows the LANGUAGE_CODE incoming from an AJAX request (other than hard coding it in the URL)? -
pass ajax data to django model with many to many relationship
I've been working on this for a while and Im stumped. I've been reading through the docs... https://www.django-rest-framework.org/api-guide/relations/#nested-relationships and still cant make sense of how this is supposed to work. If someone could help me solve this error or explain how this is supposed to work I would be very happy to get some help. Thanks What I want: send ajax to django rest framework api endpoint have django / DRF save many-to-many related data in postgreSQL db What I've got: TypeError: Session() got an unexpected keyword argument 'pose_list' models.py class Pose(models.Model): name = models.CharField(max_length=100, blank=False, default='') def __str__(self): return self.name class SeshPoseList(models.Model): order = models.PositiveIntegerField() pose_fk = models.ForeignKey(Pose, on_delete=models.CASCADE) class Session(models.Model): session_name = models.CharField(max_length=100, blank=False, default='') def __str__(self): return self.name serializers.py class PoseSerializer(serializers.ModelSerializer): class Meta: model = Pose fields = ('id', 'name') class SeshPoseListSerializer(serializers.ModelSerializer): def create(self, validated_data): return Session.objects.create(**validated_data) class Meta: model = SeshPoseList fields = ['order', 'pose_fk'] class SessionSerializer(serializers.ModelSerializer): pose_list = SeshPoseListSerializer(many=True) def create(self, validated_data): return Session.objects.create(**validated_data) class Meta: model = Session fields = ('id', 'session_name', 'pose_list') views.py @api_view(['GET', 'POST', 'PUT', 'DELETE']) def session_list(request): if request.method == 'POST': seshSerializer = SessionSerializer(data=request.data) if seshSerializer.is_valid(): seshSerializer.create(seshSerializer.validated_data) return Response(seshSerializer.data, status=status.HTTP_201_CREATED) print("sesh errors ---> ", seshSerializer.errors) return Response(seshSerializer.errors, status=status.HTTP_400_BAD_REQUEST) -
dumpdata/loaddata BInaryField results in Incorrect Padding error ondeserialization
As the subject says, I have a legacy database that stored binary blobs within the database. I'm working to do a data migration, running dumpdata without any issues, but when I try to loaddata it always fails with a django.core.serializers.base.DeserializationError: Problem installing fixture 'data.json': Incorrect padding: error. As best I can tell this is related to Django b64 encoding the binary field and then trying to restore it. I've tested it by b64 encoding the field myself and there is no issue with the field contents, any thoughts if the problem is with dumpdata or loaddata and how it might be solved? Thanks -
how to filter by pk_set in m2m_changed
i want to to update field whenever an instance been created i tried signals but it seems complicate to ManyToManyField def update_m2m(sender,instance,*args,**kwargs): if kwargs.get("pk_set"): pk = kwargs.get("pk_set") Imei.objects.filter(pk=pk).update(active=False) #and also tried this but still not work #Imei.objects.filter(pk=instance.id).update(active=False) m2m_changed.connect(update_m2m,sender=SelectMobile.imei.through) not updated , and print nothing this models.py class SelectMobile(models.Model): #others imei = models.ManyToManyField(Imei) class Imei(models.Model): imei = models.CharField(max_length=15,verbose_name='IMEI',unique=True) mobile = models.ForeignKey(MobileStorage,on_delete=models.CASCADE) active = models.BooleanField(default=True) i want to update active field in Imei model when SelectMobile created !? is there something i've missed ?thanks for helping -
Getting "|as_crispy_field got passed an invalid or inexistent field" with a field that exists
I'm using django-crispy-forms, and have run across an issue where one of my form fields won't render. The error I'm getting is telling me that the form field is either inexistent or invalid, but it definitely exists, and it's pretty much copied from other form fields that work properly on other pages. So I don't really see how it is either of those. Here's the relevant code: forms.py class AddSkillsForm: all_skills = forms.CharField( label="Skills ", widget=forms.HiddenInput(), required=False ) view.html {% extends 'base.html' %} {% load crispy_forms_tags %} {% block title %}{{ course.name }}{% endblock %} {% block content %} {% include 'course/partial/nav.html' with course=course active_breadcrumb=None %} <div class="card"> <div class="card-header"> {% include 'course/partial/menu.html' with course=course %} </div> <div class="card-body"> <dl class="row"> <dt class="col-sm-3">Name:</dt> <dd class="col-sm-9">{{ course.name }}</dd> <dt class="col-sm-3">Number of Students:</dt> <dd class="col-sm-9">{{ total_students }}</dd> <dt class="col-sm-3">Sections:</dt> <dd class="col-sm-9"> {% for section in sections %} <p>{{ section.name }}</p> {% endfor %} </dd> </dl> </div> <div class="card-body"> <p>First, you'll need to import any existing students and groups from Canvas</p> <a class="btn btn-primary" href="{% url 'import_students_and_groups' course.id%}"> Import Students and Groups from Canvas </a> <div id="skill_box"> <p>If you would like to use self-reported student skills to form teams, you can define the … -
data not showing in data base django postgresql
i have to add data in database ,but after i click on sign up button i see my data in the python shell .but the data is not added in the database. i am using postgresql. this is my code for register def register(request): if request.method == 'POST': username = request.POST['username'] email = request.POST['email'] password1 = request.POST['password1'] password2 = request.POST['password2'] user = User.objects.create_user(username=username,email=email,password=password1) user.save() return redirect('login.html') else: return render(request,'login.html') my python shell shows this-> [14/Jul/2020 03:31:58] "GET /register?csrfmiddlewaretoken=znOO3WMBIwzO1Q8DhqgsX4Xj8pGNrBkY0p27uYSefVyGi6QaNaMjdmsBD2R5jVbt&userame=hello&email=hello%40hello.com&password1=hello&password2=hello HTTP/1.1" 200 1173 my imports in views.py -> from django.shortcuts import render,redirect from .models import profile from django.contrib.auth.models import User,auth -
Make a function call using Django-cron
I want to call a method once in a week for which I made an implementation as mentioned here https://gutsytechster.wordpress.com/2019/06/24/how-to-setup-a-cron-job-in-django/ I am not sure how it works, but let me explain what I did. I need to call a method as mentioned in folder structure below. proj_application | |- myapp | |-views.py (Method call Inside) |- poll_tracked() In settings.py, I have mentioned INSTALLED_APPS = [ 'django_crontab', ] CRONJOBS = [ ('* * * * *', 'myapp.views.poll_tracked', '>>' + os.path.join(BASE_DIR, 'data.log')) ] After then I run python3.7 manage.py crontab add python3.7 manage.py runserver When I run crontab -l, I can see, * * * * * /Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7 /Users/domain/dashboard/proj_application/manage.py crontab run dceca84af9ceab8a4d39d08fa148969f >>/Users/domain/dashboard/proj_application/data.log # django-cronjobs for proj_application A new log file called data.log is generated but the method poll_tracked() mentioned is not called and the logs is empty. Any assistance is appreciated. Thanks. -
How do I compare two text files in Django?
I'm building an online judge system in Django like the one we used to have in Kickstart earlier. They gave you a text file, input.txt and then you got an output after you ran that in the form of an output.txt file. I'm aware of how this is done in Python but I'm not sure how to implement it in a Django application. My partial understanding : The user submits the output.txt file to the form and then we need to implement the Python function in the view using the form_class ( since I'm using CBVs ). But the point is that I'm not able to figure out how would the FormView ( or UpdateView ) CBV applies that function to the uploaded file. Tl;dr: How do I implement a Python function in Django that compares two text files and return if they are the same? P.S I'm not including a compiler to the online judge since I'm in the early stages of this app and it might be an overhead expense. -
I tried to upload a Django project in Heroku and end up with +4000 pending changes in source control
the other day I was doing a guided project and the final step was to upload the project in Heroku and everything went fine but now I want to do the same, followed the same steps but it's not working Somehow following the commands I ended up with this, how can I go back or start again from scratch? Even following Heroku website guide is so confusing Can someone tell me the easiest steps to upload the project in Heroku? I'm using Python but it's so confusing Also does the project has to be upload in Github properly in order to upload in Heroku? -
Digital Signature Web Application with Cryptographic Devices in Django (Python)
I am developing a web application and it needs a pdf document to be digitally signed using a cryptographic device. The characteristics of the device are specified in the following link: https://csrc.nist.gov/Projects/cryptographic-module-validation-program/Certificate/2825 The programming language used is Python (Django). I have searched for information in some forums and scientific articles. And most agree that the most elegant solution is to use the browser extension. I understand that the signing process has to be developed on the client side, more precisely using Javascript. I would like to know if there is any open source solution that can guide me. models.py class Documento(models.Model): area = models.ForeignKey(Area, on_delete=models.CASCADE, null=True, related_name="documentos") tipo_documento = models.ForeignKey(TipoDocumento, on_delete=models.CASCADE, null=True, related_name="tipo_documentos") naturaleza = models.ForeignKey(Naturaleza, on_delete=models.CASCADE, null=True, related_name="naturaleza_documentos") autor = models.ForeignKey(Funcionario, on_delete=models.CASCADE, related_name="autor_documentos") archivo_pdf = models.FileField('Subir Archivo PDF', upload_to='documentos/', validators=[validate_file, FileExtensionValidator(['pdf'])]) nombre_documento = models.CharField('Nombre del Documento', max_length=200) numero_documento = models.CharField('Numeración del Documento', max_length=200, null=True, blank=True) fecha = models.DateTimeField('Fecha de Subida', default=timezone.now) firmado = models.BooleanField(default=False) estado = models.BooleanField(default=True) def __str__(self): return self.nombre_documento def save(self): self.nombre_documento = self.nombre_documento.upper() self.numero_documento = self.numero_documento.upper() if not self.fecha: self.fecha = datetime.datetime.now() super(Documento, self).save() def delete(self, *args, **kwargs): self.archivo_pdf.delete() super().delete(*args, **kwargs) class Firma(models.Model): documento = models.ForeignKey(Documento, on_delete=models.CASCADE, related_name="documentos_firmas") funcionario = models.ForeignKey(Funcionario, on_delete=models.SET_NULL, null=True, blank=True, related_name="funcionarios_firmas") fecha_firma … -
Api root on django rest framework
I am newbie on DRF so I wonder if there a "elegant" way to add more endpoints to API Root. I have an endpoint to manage my users and another to manage their posts, but on http://localhost:8000/api/ only profiles appears. I search for some solutions that implies change the URL but I don't want that. For example my current endpoint to get all posts is localhost:8000/api/posts that looks fine. I don't want something like api/posts/posts or similar. Is there any alternative? { "profiles": "http://localhost:8000/api/profiles/" } main urls.py urlpatterns = [ path('docs/', schema_view.with_ui('swagger', cache_timeout=0), name='schema-swagger-ui'), path('admin/', admin.site.urls), path('api/', include('profiles.urls')), path('api/', include('posts.urls')), path('api/', include('comments.urls')), path('api/', include('private_messages.urls')), ] userprofile urls.py from django.urls import path, include from rest_framework.routers import DefaultRouter from rest_framework_simplejwt import views as jwt_views from .views import UserProfileViewSet router = DefaultRouter() router.register('profiles', UserProfileViewSet) urlpatterns = [ path('', include(router.urls)), path('auth/login', jwt_views.TokenObtainPairView.as_view()), path('auth/refresh', jwt_views.TokenRefreshView.as_view()), ] posts urls.py from django.urls import path, include from rest_framework.routers import DefaultRouter from .views import PostViewSet, PostByAuthorViewSet router = DefaultRouter() router.register('posts', PostViewSet) urlpatterns = [ path('posts-by-author/<author_id>', PostByAuthorViewSet.as_view()), path('', include(router.urls)) ] -
How can I join two child tables using Django Querset API?
I have a model with two child tables and one parent table. Here is the sample model classes. # Stores list of unique category names class Category(models.Model): category = models.CharField(max_length=20, unique=True, validators=[MinLengthValidator(limit_value=5)]) name = models.CharField(max_length=20, validators=[MinLengthValidator(limit_value=8)]) # Parent class for the next two child classes class DailyLog(models.Model): category = models.ForeignKey(Category, on_delete=models.CASCADE) name = models.CharField(max_length=100, validators=[MinLengthValidator(limit_value=8)]) code = models.CharField(max_length=4, validators=[MinLengthValidator(limit_value=3)]) suggested_values = models.CharField(max_length=100, null=True, blank=True) # First child class defines display order for dailylog items class DailyLogDisplayOrder(models.Model): category_item = models.ForeignKey(DailyLog, on_delete=models.CASCADE) display_order = models.PositiveIntegerField() # Second Child class publishes dailylog on a daily bases class DailyLogCheckList(models.Model): daily_task = models.ForeignKey(DailyLog, on_delete=models.CASCADE) publish_date = models.DateField(auto_now=True) daily_task = DailyTaskCategoryManager() # Log manager to get records per category How do I perform a cartesian product query? The last column comes from the first child table Dailylogdisplayorder. Here is the raw sql. select daily_task_id, checklist.publish_date, disporder.display_order from dailylogchecklist checklist, compliance_dailylogdisplayorder disporder where checklist.daily_task_id = disporder.category_item_id and checklist.publish_date='2020-07-12' I have tried using cursor.execute() method per Django documentation. However, I am not able to figure out how to return results in QuyerySet. And also looking for a better way to combine child columns using QuerySet. The return queryset is assigned to a formset. class DailyTaskCategoryManager(models.Manager): def with_displayorder(self, user): … -
need correct template syntax. Django, Jinja
{% if url == 'home' %} <h2>{{obj.name}}</h2> <span class="subheading">% {{obj.subhead}} %</span> {% else %} <h2>{{obj.en_name}}</h2> <span class="subheading">% {{obj.en_subhead}} %</span> {% endif %} just need to write without syntax error.. logic is easy: if url from (views.py name=home) is 'home' show me obj.name, else url is 'en_home' show me obj.en_name -
How to Post a List in Django Tests
How can I post a list in a django test? I retrieve the data through this command: listVar = request.POST.getlist('list[]') I know this receives a list properly because I interface with Jquery and it returns the proper list, but how can I do this is python? I have been trying code like this however printing 'listVar' always yields an empty list: form = {"list": ["element 1", "element 2"]} response = self.client.post('/viewurl/', form, follow=True) -
What might be the causes if the change to template was not reflected in the browser?
I made some changes to my Django template but it could not reflected in the browser(chrome). However, if I open another browser(safari), the change were shown. What might be the cause of this phenomenon? I am using the Django development server. -
Jinja2 with WeasyPrint is too Slow
I am creating a "Resume Builder" website using React and Django. React sends the resume data as json to django, where the pdf is generated. I am using WeasyPrint to generate pdfs and Jinja2 to insert data into the template. Jinja code includes few logical statements (I tried my best to use the least) and it contains little heavy CSS too. The time to generate a single page template is around 14-20 seconds and 20-30 seconds for a two page template. I tried to remove the CSS and kept only the HTML and data, the pdf was generated in a second or two then I removed the data and kept only the HTML and CSS and the pdf was generated in 5-10 seconds. Is there any solution to generate pdf in less than 5 seconds with HTML, CSS and data? Are they any Jinja2 configurations or tricks to improve the performance? An sample of Jinja2 used to map data on template: <div class="resumeThree-section-2"> <div class="resumeThree-left-section"> <div> <p class="resumeThree-left-section-title">PERSONAL PROFILE</p> <div class="resumeThree-descriptionBox"> {{ data.profile }} </div> </div> <div class="resumeThree-section"> <p class="resumeThree-left-section-title">CONTACT DETAILS</p> <div class="resumeThree-inputs"> <span>{{ data.email }}</span> <span>{{ data.phone }}</span> <span>{{ data.url }}</span> <span>{{ data.address}}</span> </div> </div> <div class="resumeThree-section"> <p class="resumeThree-left-section-title">SKILLS …
