Order Django queryset by value closest to 0 Question: I have a queryset that is returning a list of entries that are tied for the lead in a contest… leaders = ContestEntry.objects.filter(name=game, wins=wins) After I get this data I need to put them in order by a second field (‘difference’) as a tie breaker. The …
How to filter an item in one queryset from appearing in another queryset in django Question: I have a Django view where I am getting the first queryset of ‘top_posts’ by just fetching all the Posts from database and cutting it in the first four. Within the same view, I want to get "politics_posts" by …
DRF ManyToMany Field getting an error when creating object Question: I have a Rant model with Category linked to it using ManyToManyField. I’ve serialized it but the problem is this error: { "categories": [ "Expected a list of items but got type "str"." ] } These are my serializers: class CategorySerializer(serializers.ModelSerializer): class Meta: model = …
Filter queryset with same DateTime fields Question: I’m trying to filter a queryset with the same DateTime fields: objects = Obj.objects.filter(start_date_time=F(‘end_date_time’)) objects <QuerySet []> models.py: start_date_time = models.DateTimeField(default=now, blank=True) end_date_time = models.DateTimeField(default=now, blank=True) If I remove microseconds, then the fields are equal: obj = Obj.objects.filter(id=’id’).first() obj.start_date_time datetime.datetime(2023, 3, 10, 9, 24, 29, 326238, tzinfo=<UTC>) obj.end_date_time …
Try to Return dataset as a table with request of postman Question: I wanna Request with postman and get a table of all books as return but I can’t find a way to do this. Thanks a lot This is my model of books: class Book(models.Model): name = models.CharField(max_length=100) username = models.ForeignKey(User, on_delete=models.CASCADE) publication_date = …
How to add additional choices to forms which is taken from a model in django Question: As in the topic is it possible to add choices to the forms that take from the model. forms.py class BookGenreForm(forms.ModelForm): class Meta: model = Book fields = (‘genre’,) models.py class Book(Product): GENRE_CHOICES = ( (‘Fantasy’, ‘Fantasy’), (‘Sci-Fi’, ‘Sci-Fi’), …
How to merge two queryset based on common key name in django Question: Let’s say I have 2 QuerySet: <Queryset [a, b, c]> and <Queryset [a, d, e]> How can I merge those two to achieve: <Queryset [a, b, c, d, e]> Edit with real case: qs_home = Match.objects.filter(competition=competition) .values(name=F("home_team__name")) .annotate(home_win=Sum(Case(When(home_score__gt=F(‘away_score’), then=1)))) .annotate(home_draw=Sum(Case(When(home_score=F(‘away_score’), then=1)))) .annotate(home_lose=Sum(Case(When(home_score__lt=F(‘away_score’), …
How to customise Folium html popups in a for loop in python using .format()? Question: I am trying to change the standard popups provided with Folium and make these work with a for loop. I am using Django. I succeeded on change the html, following a few tutorials. However I am struggling to understand how …
Removing objects from a queryset by ID optimal implementation Question: I have a queryset of 1000000 objects MyModel. All objects in queryset have an ID. I pass a list of ids to remove, for example: ids = [‘1′, ’23’, ‘117’, …] # len = 100000 Then, i need to delete objects in queryset with ids. …
Why the first() method and slices works differently in Django? Question: I have the model: class PhotoAlbum(models.Model): id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False, auto_created=True) name = models.CharField(max_length=50, verbose_name=’Album name’) type = models.ForeignKey(AlbumType, on_delete=models.CASCADE, verbose_name=’Album type’) created_at = models.DateTimeField(auto_now_add=True) And i have this code: print(PhotoAlbum.objects.all().first()) print(PhotoAlbum.objects.all()[:1].get()) it seemed to me that the same objects should be displayed, …
