Django community: RSS
This page, updated regularly, aggregates Django Q&A from the Django community.
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How to get specific field from serializer of Django rest framework
Inside Views.py, I have these code: class ServerViewSet(viewsets.ViewSet): def list(self, request): servers = Server.objects.all() serializer = ServerSerializer(servers, many=True) return Response(serializer.data) # In here, I want to get the server name only def retrieve(self, request, pk=None): servers = get_object_or_404(Server, pk=pk) serializer = ServerSerializer(servers) return Response(serializer.data) # In here, I want to get the server name and ip address Inside serializers.py, I have these code: class ServerSerializer(serializers.HyperlinkedModelSerializer): class Meta: model = Server # fields = '__all__' fields = ('id', 'name', 'desc', 'ip_address') Is there an official method to filter out the specific field from serializers.data -
Сelery hangs on startup
I'm trying to use real-time processing with a Django app that is configured as specified in the documentation. Without my_monitor() functions from the example, celery works fine, but as soon as I add this function it doesn't run. Project struct: - proj/ - firstapp/ - manage.py - proj/ - __init__.py - celery_config/ - __init__.py - main.py - ... - celery.py - settings.py - urls.py - ... - ... In celery.py file I have the following code that works: from __future__ import absolute_import import os from celery import Celery from . import celery_config as config os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'proj.settings') celery_app = Celery('proj') celery_app.config_from_object(config) celery_config stored broker_url, queues, routers, shedule and etc. Run celery: $ celery -A proj ... and in this form it works fine then I add the function in celery.py: def celery_logger(app): state = app.events.State() def logging_task_received(event): state.event(event) task = state.tasks.get(event['uuid']) # here I want to add your own log entry in db with app.connection() as connection: recv = app.events.Receiver(channel=connection, handlers={ 'task-received': logging_task_received, }) recv.capture(limit=None, timeout=None, wakeup=True) celery_logger(celery_app) and now, it hangs when you call celery -A proj ... -
Django ManytoManyField and widgets
I have two models, Product and Category and ManytoMany field in Product. The Category appear as key on ProductCreate View. I need to customize the widget and field for Categories. I checked in Django source Fields and Widgets but I don't see a reference(class) for ManyToMany. To what type of Field and Widget ManyToMany relationship corresponds(I presume is Charfield as save or SelectField)? Where I can find the code ? (an example to customize field/widget in this case) -
Django: Cannot display object image in DetailView
As you see in shot-screens the object image is shown in ListVIew. but I don't have access to this image in DetailView with same url. List View: {% for team in teams %} <tr> <td>{{ forloop.counter }}</td> <td><img src="{% thumbnail team.logo 30x30 %}" alt=""> {{ team.name }}</td> .... Detail View: ... <h3 class="page-header"><img src="{% thumbnail team.logo 30x30 %}">{{ team.name }}</h3> ... -
Get data from 2 Model in Django python
class Product(models.Model): name = models.CharField(max_length=200) price = models.FloatField() avgrating = models.FloatField() def __str__(self): return self.name class Rating(models.Model): Product_id = models.ForeignKey('Product', related_name='Product_id') User_id = models.ForeignKey('User', related_name='User_id') rate = models.IntegerField() I want like - name of the product - price of the product - avgrating (AVG rating) - depend on User_id and Product_id and SQL query like: select p.name,p.price,p.avgrating,r.rate from Product p, Rating r where User_id=1; out Like: in json formate { "name":"Iphone 8", "Price":80000, "avgrating":3.5, "rate":5 } -
I want to use wpadmin in django but having an issue
Hello everyone I want to integrate wpadmin by barszczmm into my django project but in his documentation he has written Add django.core.context_processors.request to TEMPLATE_CONTEXT_PROCESSORS setting. Icannot exactly understand what this means . I tried by adding this line django.core.context_processors.request in setting.py under templates -> 'context_processors' but nothing happened and server gives the exception InvalidTemplateLibrary at /admin/ .please tell me exactly what to do -
Django passing variables into string
I'm trying to pass: img src="{% static '/static_dirs/images/itcg/01_{{ card_id }}.jpg' %}" alt="{{ card_id }}"> to load image with file name 01_xx.jpg, but the result is just xx without image. Basically what happens is that {{ card_id }} works in alt but I can't load the image. I have tried to change 01_{{ card_id }}.jpg into 01_01.jpg and it works, so the static files can load properly but apparently 01_{{ card_id }}.jpg is not working as intended. I also tried to changing one of my image name from 01_01.jpg into 01.jpg and do the following: img src="{% static '/static_dirs/images/itcg/{{card_id}}.jpg' %}" alt="{{ card_id }}"> The image still not loading, so I guess the problem is not in "01_" part either. Can someone help? -
ReferenceError: toastr is not defined when using Material Bootstrap alert
I'm trying to use Material Bootstrap Alert in my Django app. If user inputs wrong password or username while trying to login to the page, the error toast message should appear in the upper right corner. With js alert it works perfectly fine but when I'm trying to invoke toastr.error('Wrong login credentials. Please, try again...'); I get these erorrs: jQuery.Deferred exception: toastr is not defined @http://127.0.0.1:8000/login/:63:9 j@http://127.0.0.1:8000/static/js/jquery-3.2.1.min.js:2:29997 g/http://127.0.0.1:8000/static/js/jquery-3.2.1.min.js:2:30313 undefined ReferenceError: toastr is not defined Here is my login.html page: {% extends 'utas/template.html' %} <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>{% block title %}Login{% endblock %}</title> </head> <body> {% block pagecontent %} <div class="container"> <!-- Begin Form login --> <form method="post" class="mt-5" style="width: 24rem; margin: 0 auto;"> {% csrf_token %} <p class="h5 text-center mb-4">Sign in</p> <div class="md-form"> <i class="fa prefix material-icons grey-text">account_circle</i> <input type="text" id="defaultForm-user" class="form-control" name="username" required oninvalid="this.setCustomValidity('Username is required!')" oninput="setCustomValidity('')"> <label for="defaultForm-user">Your username</label> </div> <div class="md-form"> <i class="fa prefix material-icons grey-text">lock</i> <input type="password" id="defaultForm-pass" class="form-control" name="password" required oninvalid="this.setCustomValidity('Password is required!')" oninput="setCustomValidity('')"> <label for="defaultForm-pass">Your password</label> </div> <div class="text-center"> <button type="submit" class="btn btn-default">Login</button> </div> </form> <!-- End Form login --> </div> {% endblock %} {% block script %} {% if form.errors %} <script type='text/javascript'> $(document).ready(function() { toastr.error('Wrong login credentials. Please, … -
pyAudio stream audio with Paspberry Pi
I want to stream music using pyAudio and Raspberry Pi. What I am doing is like this: def play(request): CHUNK = 1024 wf = wave.open("/var/www/moozee/MusicApp/music/mymusic.wav", 'rb') p = pyaudio.PyAudio() stream = p.open(format=p.get_format_from_width(wf.getsampwidth()), channels=wf.getnchannels(), rate=wf.getframerate(), output=True) data = wf.readframes(CHUNK) while data != '': stream.write(data) data = wf.readframes(CHUNK) stream.stop_stream() stream.close() p.terminate() return HttpResponse('success') and my urls.py from .views import play urlpatterns = [ url(r'^play-stream/$', play, name='stream'), ] The problem is when I type this url in browser it gives me OSError [Errno -9996] Invalid output device (no default output device) here is my gunicorn.service [Unit] Description=gunicorn daemon After=network.target [Service] User=umar Group=www-data WorkingDirectory=/var/www/moozee/MusicApp ExecStart=/var/www/moozee/MusicApp/.venv/bin/gunicorn --access-logfile - -- workers 3 --bind unix:/var/www/moozee/MusicApp/moozee.sock Capstone.wsgi:application [Install] WantedBy=multi-user.target Here is my Nginx configuration server { listen 80; server_name DOMAIN_NAME; location = /favicon.ico { access_log off; log_not_found off; } location /static/ { root /var/www/moozee/MusicApp; } location / { include proxy_params; proxy_pass http://unix:/var/www/moozee/MusicApp/moozee.sock; } } How can I fix this issue? I am running my project on Raspberry Pi server and I know that this problem is due to Raspberry Pi has no default audio output device. I want to play this audio on web-browser but I have no idea how to go further. Thanks in advance! -
Django disable a link if list returns empty
I don't want to display a link if the list returns empty. template.html {% for item in cart %} <h1>{{ item.product.product_title }}</h1> <a href="{% url 'products:remove_from_cart' item.product.id %}">Remove item</a> {% empty %} <p>No items in cart</p> {% endfor %} {% if item is not None %} <p> <a href="{% url 'products:checkout' %}">Checkout</a> </p> {% endif %} views.py def cartview(request): if request.user.is_authenticated(): cart = Cart.objects.filter(user=request.user.id, active=True) orders = ProductOrder.objects.filter(cart=cart) #total = 0 count = 0 for order in orders:) count += order.quantity context = { 'cart': orders, 'count': count, } return render(request, 'store/cart.html', context) else: return redirect('index:index') I want to hide checkout link if the cart list is empty. putting it in the for loop would make the link appear many times. I want to display checkout button only once. -
Django 127.0.0.1:8000/admin/ stopped working
Not sure what I've done to break the admin site, but going to 127.0.0.1:8000/admin/ is not working and gives me the error in the screenshot below: Here's the two urls.py files: myproject/urls.py from django.conf.urls import include, url from django.contrib import admin import product_app.urls urlpatterns = [ url(r'^admin/', admin.site.urls), url(r'^', include(product_app.urls)), ] and the product_app urls.py: from django.conf.urls import url from django.conf import settings from django.views.static import serve from . import views from .views import * urlpatterns = [ url(r'^$', views.HomePage.as_view(), name='home'), url(r'^contact/$', views.contact, name='contact'), url(r'^subscribe/$', views.subscribe, name='subscribe'), url(r'^products/$', views.products, name = 'products'), url(r'^product/$', ProductListView.as_view(), name='product_list'), url(r'^user/(\w+)/$', views.profile, name='profile'), url(r'post_url/', views.post_product, name='post_product'), url(r'^([0-9]+)/$', views.detail, name = 'detail'), url(r'^login/$', views.login_view, name='Login'), url(r'^logout/$', views.logout_view, name='Logout'), url(r'^like_product/$', views.like_product, name='like_product' ), url(r'^profile/edit/$', views.edit_profile, name='edit_profile'), url(r'^(?P<pk>\d+)/edit/$', PostUpdateView.as_view(), name='product-edit'), url(r'^(?P<pk>\d+)/delete/$', PostDeleteView.as_view(), name='product-delete'), ] if settings.DEBUG: urlpatterns += [ url(r'^product/(?P<path>.*)$', serve, { 'document_root': settings.MEDIA_ROOT, }), ] ...and just in case, the models.py: from django.db import models from django.contrib.auth.models import User from django.core.urlresolvers import reverse def get_image_path(instance, filename): return '/'.join(['product_images', str(instance.name), filename]) class Product(models.Model): user = models.ForeignKey(User) name = models.CharField(max_length=100) description = models.CharField(max_length=300) price = models.DecimalField(max_digits=10, decimal_places=2) url = models.CharField(max_length=200) product_type = models.CharField(max_length=100) image = models.ImageField(upload_to='product_images', blank=True, null=True) image_url = models.CharField(max_length=200, blank=True) likes = models.IntegerField(default=0) def __str__(self): return self.name … -
django-admin startproject myproject is not working
I'm new to django and wanted to begin learning it but I am stuck at creating a new project. So, far I tried command django-admin startproject mysite and django-admin.py startproject mysite but the outcome produces -bash: django-admin.py: command not found and -bash: django-admin: command not found. I also tried this in a virtualenv but it produces the same thing. (mysite) xxxxxxx (master *+) django-tutorial $ django-admin startproject myproject -bash: django-admin: command not found (mysite) xxxxxx (master *+) django-tutorial $ django-admin.py startproject myproject -bash: django-admin.py: command not found I am running mac osx el capitan -
DatabaseError: current transaction is aborted, commands ignored until end of transaction block on manage.py syncdb
I cloned an existing django project and set it up on a virtualenv on Windows 10. I installed the following tools; Django==1.5.1 pillow==2.5.1 South==1.0.2 django-autocomplete-light==1.1.7 django-haystack==2.3.1 django-memcache-status==1.1 #django-mptt==0.5.4 mailsnake==1.6.3 psycopg2==2.4.5 requests==1.1.0 simplejson==3.1.0 sorl-thumbnail==11.12 textile==2.1.5 #xapian-haystack==1.1.5beta gunicorn==19.1.1 #pycurl==7.19.5 django-widget-tweaks==1.3 pycountry==1.10 django-jsonfield==0.9.13 python-dateutil==2.3 geopy==1.7.0 whoosh==2.5.7 structlog==15.1.0 celery==3.1.17 python-memcached==1.54 I am using postgresql 9.6. When I ran python manage.py syncdb I get the above error, interestingly when I comment out all other apps, apps that ship with Django successfully sync. The following is the error log from pg_log; ERROR: relation "pages_entrytype" does not exist at character 755 STATEMENT: SELECT "pages_entrytype"."id", "pages_entrytype"."created", "pages_entrytype"."created_by_id", "pages_entrytype"."modified", "pages_entrytype"."modified_by_id", "pages_entrytype"."visible", "pages_entrytype"."name", "pages_entrytype"."title", "pages_entrytype"."header", "pages_entrytype"."description", "pages_entrytype"."meta_description", "pages_entrytype"."content", "pages_entrytype"."sortorder", "pages_entrytype"."system_required", "pages_entrytype"."old_id", "pages_entrytype"."old_table", "pages_entrytype"."parent_id", "pages_entrytype"."lft", "pages_entrytype"."rght", "pages_entrytype"."tree_id", "pages_entrytype"."level", "pages_entrytype"."slug", "pages_entrytype"."bookable", "pages_entrytype"."icon", "pages_entrytype"."icon_hover" FROM "pages_entrytype" WHERE UPPER("pages_entrytype"."name"::text) = UPPER('accommodation'). ERROR: current transaction is aborted, commands ignored until end of transaction block. STATEMENT: SELECT c.relname FROM pg_catalog.pg_clasLEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace WHERE c.relkind IN ('r', 'v', '') AND n.nspname NOT IN ('pg_catalog', 'pg_toast') AND pg_catalog.pg_table_is_visible(c.oid) LOG: could not receive data from client: An existing connection was forcibly closed by the remote host. I have ensured lazy loading in my models. -
Django : Conditional expressions in get_queryset(self)
I am in Django 1.11 and I would like to combine what I read: https://docs.djangoproject.com/fr/1.11/ref/models/conditional-expressions/ https://docs.djangoproject.com/fr/1.11/topics/class-based-views/generic-display/ https://docs.djangoproject.com/fr/1.11/ref/models/querysets/#django.db.models.Q For example, suppose I have something like this that will check if Objects are in the user area and a ListView use it. open_help_requests = HelpRequest.objects.filter(state=HelpRequest.OPEN) filtered_help_requests = [] for help_request in open_help_requests: """ Formule de Haversine pour connaitre la distance entre deux points géographiques """ earth_radius = 6373.0 lat1 = radians(help_request.student.studentcollaborator.postal_code.latitude) lon1 = radians(help_request.student.studentcollaborator.postal_code.longitude) lat2 = radians(request.user.student.studentcollaborator.postal_code.latitude) lon2 = radians(request.user.student.studentcollaborator.postal_code.longitude) dlon = lon2 - lon1 dlat = lat2 - lat1 a = sin(dlat / 2) ** 2 + cos(lat1) * cos(lat2) * sin(dlon / 2) ** 2 c = 2 * atan2(sqrt(a), sqrt(1 - a)) distance = earth_radius * c if distance <= help_request.settings.distance: filtered_help_requests.append(help_request) What I want to move this condition check inside the filter in def get_queryset(self): so that I could directly make additional simple order/filter operations with the filtered QuerySet. Recreate the QuerySet with the filtered variable list id looks too heavy (like this : Django get a QuerySet from array of id's in specific order). Any ideas ? Thanks. -
Returning JSON object from rest API
I am attempting to return a json object from a rest API. I'm using django and when I view the object from the web, I can see the data as a json object: [{"user": 2, "content": "please work", "members": [1], "date": "2017-11-04T21:44:23Z", "attendees": [2]}] I am trying to receive it in react and then display the content from it: export default class fetchPosts { constructor(props){ this.state = { data: [], error: false, refreshing: false, url: 'http://127.0.0.1:8000/post/PostList', } } fetchAllPosts = () => { fetch('http://127.0.0.1:8000/post/PostList') .then(res => res.json()) .then(response => { this.setState({ loading: false, data: response, refreshing: false, }); console.log(data) return data }) } } but using the console log in my react debugger all that is returned is this strange object. I understand that the console log may not display it precisely, however even when I attempt to deconstruct and render it, it tells me either the promise was rejected or data.content is null. -
Is there a Python/Django equivalent to Rails bundler-audit?
I'm fairly new to Django so apologies in advance if this is obvious. In Rails projects, I use a gem called bundler-audit to check that the patch level of the gems I'm installing don't include security vulnerabilities. Normally, I incorporate running bundler-audit into my CI pipeline so that any time I deploy, I get a warning (and fail) if a gem has a security vulnerability. Is there a similar system for checking vulnerabilities in Python packages? -
Django can't make external connections with requests or urllib2 on development server
Everytime I make an external request (including to google.com) I get this response: HTTPConnectionPool(host='EXTERNALHOSTSITE', port=8080): Max retries exceeded with url: EXTERNALHOSTPARAMS (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x105d8d6d0>: Failed to establish a new connection: [Errno 8] nodename nor servname provided, or not known',)) -
App Engine + Django: ImportError: No module named django.core.wsgi
I'm deploying a simple Django app to Google App Engine. How can I fix the following? Traceback (most recent call last): File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 240, in Handle handler = _config_handle.add_wsgi_middleware(self._LoadHandler()) File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 299, in _LoadHandler handler, path, err = LoadObject(self._handler) File "/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 96, in LoadObject __import__(cumulative_path) File "/base/data/home/apps/s~google.com:walle120-code/20171104t152156.405293023907909181/mysite/wsgi.py", line 12, in <module> from django.core.wsgi import get_wsgi_application ImportError: No module named django.core.wsgi -
Django Admin: object is not JSON serializable error on Custom Field Sub-classing JSONField
I'm trying to de-normalize my Django Postgres database that backs a JSON API by storing certain objects in JSONFields: https://docs.djangoproject.com/en/1.11/ref/contrib/postgres/fields/#jsonfield I extended the django.contrib.postgres.fields.JSONField field to serialize data into Python objects automatically. I'm doing this in order to encapsulate my logic around the objects and to enforce the structure of the objects stored in the JSONField. I'm following the Django documentation on custom model fields here: https://docs.djangoproject.com/en/1.11/howto/custom-model-fields/ I'm able to store my objects in the custom JSONField and can retrieve them as native Python objects, however, I've broken the admin console. When I try to view one of my objects, i get this error: TypeError: <core.fields.PostalAddress object at 0x7fdcfaade4e0> is not JSON serializable I assume that the problem is that built-in json.dumps function doesn't play nicely with random objects, so I hope that there is some method I can override in my PostalAddress class to get it to play nice. Here is my code, although this is a simple case of an address, I want to apply this pattern to more complicated and useful custom JSONField use cases, so I would like to see the serialized JSON in the admin console and be able to edit the text and save … -
Geodjango custom-specific admin panel
I would like to know what is the best approche to handle indoor mapping using GeoDjango. To be more specific, I've read a lot of articles and watched a lot of tutorials, yet none of it covered a simple usage of adding an employee to a room using geodjango admin CMS. Does anyone know how I should handle it? Lets say I've an employee (Point) and a Room (Polygon). Lets say that someone choose to add/delete/move Employee in Room no. 1 from admin panel, and what I wish to achieve is to prompt to user this very room on map base map (which is an easy part), and then (somehow) I would need to load also every employee from database that is already set in this room, so he can move/delete them or add another one. Is this even possible to do? I would really appreciate any kind of help. Links to tutorials, articles, and so on (if there are any that I wasn't able to find, because I've spent a lot of time to find it). Also if this is impossible, maybe someone can tell me what would be the way to go, considering that I need to create … -
Django Admin: Making Sure a model is accessed by one user at a time
I have a Django Model instance and I want to make sure it is accessed by one user at a time on the Django Admin site. Example: User_1 logs in to Django Admin and accesses this model instance. Now User_1 can see all the fields and edit them. Meanwhile, User_2 opens the same model in Django admin. User_2 can't edit this model and all actions are disabled. As soon as User_1 closes this form (navigating away from form) User_2 can edit it. I have thought of using Django signal but don't know how to go about it. -
what does run the command \dt mean?
I'm teaching myself django. At this site https://docs.djangoproject.com/en/1.11/intro/tutorial02/ It says If you’re interested, run the command-line client for your database and type \dt (PostgreSQL), SHOW TABLES; (MySQL), .schema (SQLite), or SELECT TABLE_NAME FROM USER_TABLES; (Oracle) to display the tables Django created. I really don't know what that means. Do they want me to input some commands in the terminal? If so what commands? -
Django project printing to console instead of browser
What I'm trying to do: Translate input -> pig latin onclick and display output. See code below: class translator: def pigLatin(sentence): translation = " " for word in sentence.split(): if word[0] in "aeiou": translation += word + "yay " if word[0] and word[1] not in "aeiou": translation += word[2:] + word[0:2] + "ay" print("hai") else: translation += word[1:] + word[0] + "ay " return translation sentence = input("Enter word/sentence you want translated to pig latin below: ") print(pigLatin(sentence)) What's happening: As soon as I run my local server, the above input prompt ^ appears in console, as seen below: translator running in console Problem being, I want this to appear in my browser onclick. Instead, when I click my "translate" button, it just repeats my translate div in the output section. (see below image for clarity.) translator in browser Other relevant code/file structure: Views.py from django.shortcuts import render from django.http import HttpResponse from pigLatinApp import pigLatinTranslator def index(request): return render(request, 'pigLatinApp/home.html') def output(request): if request.is_ajax(): py_obj = pigLatinTranslator.translator return render(request, 'pigLatinApp/home.html', {'output': py_obj}) Templates header.html <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width,initial-scale=1"> <title>Pig Latin Translator</title> {% load staticfiles %} <link rel="stylesheet" href="{% static 'css/bootstrap.min.css' %}" type="text/css"> </head> <body … -
Creating a foreign key for user from one app to another in Django
I wanted to create a user foreign key in my tasks models.py to another table called UserProfile. I want a task to be associated to a user so when I go to query it and display it in a profile page, I don't see anyone else's. However, when I attempted this, I got this error: This is my tasks.model.py This is my useraccounts.models.py -
Django Field and Widget and __deepcopy__
I want to create a custom field with custom in Django. Because I like to understand how things are working I checked the Django code, and I see that in Field class widget = widget or self.widget if isinstance(widget, type): widget = widget() else: widget = copy.deepcopy(widget) The Field class is overwriting the default deepcopy def __deepcopy__(self, memo): result = copy.copy(self) memo[id(self)] = result result.widget = copy.deepcopy(self.widget, memo) result.validators = self.validators[:] return result Also the Widget class do the same thing. def __deepcopy__(self, memo): obj = copy.copy(self) obj.attrs = self.attrs.copy() memo[id(self)] = obj return obj I know what copy and deepcopy does (did some examples), I want to understand why Django needs a deepcopy of the widget and why is overwriting the default __deepcopy__ ?
