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How To Add Calculated Fields To Models - Django Wednesdays #40
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- Опубликовано: 14 авг 2024
- In this video I'll show you how to add a calculated field to your models with Django and Python.
Adding calculated fields allows you to make calculations using the data in your model, without actually adding extra fields to your model.
This lets you do things on the fly in real time that you might not be able to easily do with just the model itself.
We'll be using @property for this.
#django #codemy #JohnElder
Timecodes
0:00 - Introduction
1:18 - Create @property in models.py
3:00 - Change Date on an Event
3:25 - Change Order of Events
3:50 - Add Days_till To HTML Template
4:50 - Import Datetime Date
5:03 - Get Event Date From Model
6:08 - Get Today's Date
6:17 - Compare Today's Date To Event Date
6:51 - Strip Out Time From Date Till
8:18 - Find If Event Is Past or Future
9:31 - Conclusion
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fantastic video as always!
This channel should be the biggest coding channel on youtube!
edit: typo
Wow, thanks!
Thanks my man you realy saved the day , great video
Assist pliz -- how do i compare todays current time and event time
yo man you have no idea how this has helped out even that second @properties you did ,esspecially that one, fixed a lot of problems for me. Keep making more great content and stay blessed brother.
Happy to hear it!
This video really saves my day, and all your videos are awesome.
Happy to hear it!
Great video. So simple and straightforward👍
Glad you liked it!
hello
How to make computed field available in admin ?
Un bon exposé. Mes félicitations pour tout ce que vous faites. Je voudrais rappeler que la différence entre 2 dates en Python ne fait pas apparaitre "days 00:00:00" quand les deux dates sont égales. Par conséquent, le split() donnera une erreur. Merci
Okay, so what would the steps be if i want to store some calculated info. in the forms and make i non-editable for non-admins?
Quick tip 😁
You can use date template tag to print only the date
Thanks for your works sharing
💖💖💖💖
Welcome :-)
How?
Thank you so much sir.😷
Very welcome
Hi, I have two models and the names are Budget and Transaction. One budget can have multiple transactions, I would like to sum each transaction and subtract the total from the particular budget. I used the @property decorator, but how include this calculation from different models. Thanks in advance!
I like this guy he looks like Walter white from the breaking bad serie
Haha Thanks
Thank you so must Sir
Very Welcome!
I have a few questions. I’m making a flashcard project, I followed your tutorial for the language one but to take it further I want to use SQLite to store the words. I’ve already created my table how do I call the contents for it to be displayed on the GUI of the flashcard.
Also I have a menu but when I click between the menu the contents of it gradually go further and further down. How do I make it stay stationary when I switch between the menu items
Are you talking about tkinter? I have videos on all that stuff.
Merveilleux merci! Would be nice to add email notifications via dropdown email list as an event approaches a certain number of days. Additionally a dashboard with total number of events as well as breakdown number of events of event type...j'apprécie ton tuto merci :)
noted :-p
Hey John- perhaps I haven't dived deep enough, but do you have a video on paginating the returned searches?
I have a video on pagination
I need help
I have a django db model which has a manytomany field.
Problem i have is adding values to that field from my views.py
I used obj.field.add(“”)
Obj.field.set(“)
Nothing is working
I have many videos about adding things to the database.
I think it should be obj.feild.addWidget(")
Whenever I click my menu item, my label along with what’s on the GUI gradually keep going down with every click of it. How do you fix that, if you could link the video to that, it would be great.
You’re amazing btw, I learn from your videos all the time
Sorry, I have no idea what you're talking about. This is a django video, there are no menu items or gui's
pretty cool, except doing exactly that, no access to the property... No idea what causes that issue.
what did you do differently?
@@Codemycom I found the issue. I was trying to call the property which returned an object. For testing I placed it in a for loop which did not create any instances of the class. So since there was no instance of the class, of course the object was just an object without an instance for the way in which it was called. Moving it to a loop which did create a class instance worked. So I need to learn a bit more about that and OOP and django.
can i get money from my website? if i do a good web
Sure, it depends on the website and it's purpose
Please Make a video on how to host django site free to show our friends...
ruclips.net/video/Li0Abz-KT78/видео.html
it works the same with Django, I think
Ohh, Thanks a lot
Yeah I have those already on the channel.
i wanna free domain pls how
No, domains cost money from a registrar.
Hello John, is it a good practice to just add:
if self.event_date.date() > today:
return days_till_split
else:
return "Event passed!
at 8:18?
It's a good practice to do anything you want to do :-p