Tag: django

A count of ForeignKey

django django-model-field django-models foreign-keys python

I have class Team, which means a group of users. And the relation with User is One-to-Many. But Team may consist of 2 and N members. I think to write manually is not our way, because it depends on count of people which is always variable. How can I do it more elegant and rational? I mean to connect count

Date filter binned data

django django-models filter python

I have a model in django that contains a start and end date for a financial year and a value for demand volume. I would like to filter this data on a given date range that may not coincide with the date ranges of the data, taking a proportion of the demand from each data point that may fall somewhere

How to display multiple django database models in a flex box row?

css django flexbox html python

So just to give some information, I know how flexbox works and sorta know how django works and have displayed django database models on a page before already, using a loop. The issue I’ve encountered is I want to have multiple (three) of these models on a row kinda like if I used a flex box with three d…

How can I use map operator with for loop?

django python

I have a function that returns a list of the total counts. I want to use the map but don’t know how I can use it. Here is my function: I want to use this with the map. Answer I don’t think it’s neccessary. you are just constantly adding terms, so it’s just a sum and it doesn’t re…

Upload PDF File via Django Admin, Users Download from Link on Template

django python

I’m trying to allow users to download a PDF file that I’ve previously uploaded to the MEDIA_ROOT folder via the admin console. I’ve emulated the answer in this post, however it’s incomplete and I can’t figure out how to fix this. Hoping someone can spot my issue in the code below…

Django 4.x – Conditional order_by of a QuerySet

django python

The Objective The objective is to conditionally order a QuerySet by one of three different date fields in the view based on another field in the model. Since conditional ordering cannot be accomplished with Class Meta I am exploring accomplishing this objective in the view. Here is the relevant excerpt from m…

Django search returning Exception Value: object of type ‘method’ has no len()

django django-models django-rest-framework django-views python

Pretty new to Django Rest Framework and I’m not quite sure how to debug this error at the moment. When I set a breakpoint in the view search view. I see all my products in results Pagination is set in settings.py Search view Products view Products model Below is the full trace of my error Answer You are…

Django is_active field is not changing

django django-admin django-forms django-models python

I’m using django 4.0 when i change the is_active to False from django admin, it doesn’t make any changes to the object, I have override the save method in models. models.py admin.py Can anyone advise ? The problem started when i added the save() in models.py Answer The .save() method should always…

Python returning false on checking if a string exists in list even when it does

django python

I imported a model(named Feature) and set it to a list in Django upon calling the 5th element print(posts[5]) this displays apple in shell which is the 5th object however on checking it with a if condition it returns false and it prints no .. why is this happening even tho apple exists in the list Answer &#82…

Querying a Django model and comparing its fields for similarities or near duplicates

django orm python

I have a model that records changes to other models in my database. I would like to query for changes that only add a newline character — n. My changes model looks like this: Essentially, I want to find instances of Change where the difference between a value for a key in old_fields and new_fields is n.…