I have tried to add a book in to the database using an HTML form. After the submission, the page redirect to a page where all the books are listed .Then whenever I refresh the page , the data is became duplicated. How do I resolve this problem? urls.py views.py Template file: Answer This is most common proble…
Tag: django-queryset
AttributeError: ‘tuple’ object has no attribute ‘model’. How to fix this error?
I’m new to Django. Please help me to solve this error. I’m not getting any solution. I tried many stackoverflow solutions and GitHub solutions but I’m not getting where the error is coming from. urls.py models.py views.py serializers.py Exception log Here is the github link of the app –…
django getting all objects from select
I also need the field (commentGroupDesc) from the foreign keys objects. models.py views.py Here I get the commentGroup fine but I also need commentGroupDesc to put into my form. Answer At first, it’s not a good thing to name same your model field as model name which is commentGroup kindly change field n…
Get latest item date where item field_1 & item field_2 have duplicates
I’m using Django 4.0, and Python 3.8. I have a product that has a modification date, department name and designation. I want to retrieve each product but, for products that have the same designation and the same department, I only want to retrieve the last entry. Here is what i have now: I tried sorting…
How to return a string expression for order_by args in django queryset?
Let’s say I want to do this in the views of a Django project: I expect the order_by_query to be a string like “field1,-field2”. So I will write a function like: My questions are: what should I write inside the compile_ob function? what should I return as type? Answer You actually don’t…
Code to display Django (Reverse) related table throws error
I’m quite new to Django and practicing Models section of Django by following its official tutorial. I also created a project of my own and try to apply similar concepts. This is my models.py; Now when I run below command in Python/Django shell it runs as expected with the related data. Below two also wo…
Creating a single-column dataframe in Pandas from a Django queryset
I’m trying to create a dataframe containing the values from field_1 and field_2 in a single column. I haven’t used pandas a whole lot before, so I’m sure this is naive. If I’m working with a fairly large dataset, is there a way I can make this more efficient? I would like to eliminate …
Django get data from related model which has the FK
how can i make this queryset: models with Property.objects.all() I can see in the returned object that there is a listing_set let say: but it brings the entire model, and not the related to property_id; also tried to get Ota data in serializer with SerializerMethodField and perform a new query to get this inf…
Django: Perform GROUP BY over a view queryset
I need to perform group by over a queryset of objects already filtered by standard django filters in order to filter by how many objects in queryset are related to same foreign key object. My code now (does not work): If I filtered over all objects, I could have used but how can I do the same thing with Query…
Django Traverse Foreign Keys
I have 3 models and I am trying to create a dashboard with a list of Trials that spans all Client Sessions for a specific client chosen via a filter. Here are the models: Here is the view that im trying to create Answer You have an error filter query you used Filter data. Expected is queryset. Change, trial_l…