Database Relationships | One To Many & Many to Many | Django (3.0) Crash Course Tutorials (pt 6)
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- เผยแพร่เมื่อ 2 ธ.ค. 2019
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Introduction to Database model relationships. In this video we will be covering "One to Many" and "Many to Many" relationships and how this is implemented in Django.
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Your Visual representation of the relationship help us understand clearly, how i wish there are somethings like this in the Django documentation, it make things very easy! Thanks Dennis!
I'm italian and i already watch 2 courses in italian language. But just now with your course i start understand better django! You're really the best... thanks for all!
Really good content Dennis. Can you make a future mini series on understanding model relationships in Django and at the same time explaining the concept of making good ER diagrams for any website project. There are not many videos out there covering these concepts
in depth and you explain extremely well. It would be really helpful if you would consider making a series like that in the near future
i never really understood the intermediary table in the ManyToMany relationship until now, Thanks a lot for giving such a clear and easy to understand explanation!
Best Django series I have ever seen 😍🔥super easy to understand💯
Dennis, you make the best videos on Django. I am an engineer from South Africa. You are the most relatable coding youtuber to me. Keep making great content. It helps more than you know!!!
I took many tutorials before this tutorial I have never seen like this one thanks million times dennis ivy
The principle was explained much better then most tutorials that are floating around. It`s structured and reproducible. +1 to your channel! Cheers!
I appreciate that Georgi :)
many thanks to Dennis!! this channel is really beginner friendly
Some tutorials are goo, some are so good and well explained which is also easy to follow and then comes your videos! Perfect tutorials to learn from! Thanks a lot
I finished an entire udemy course and made two project tutorials on it but I didn't understand this concept until this video and project. Thanks mate!
Greatest videos about Django I've ever seen. Super Dennis.
Loud and clear, thanks mate !
I did relational database for quite some time. Glad you corrected that Tags should be on Product and not on Order. It bothered me but I kept watching anyway cos I'm clueless with Django. Great series!
Everything in this tutorial is awesome ! Your explanations are very good too. Thank you
Thanks!
Your free explanations are the best.
Keep it like this
Dennis, thank you for this useful tutorial! Easy to follow, well done!
You've put in lot of hard work on this
Appreciation from India
Thanks for this content man. The quality is awesome
It's just awesome...
I referred a lot videos for django. .but your series is awesome..no comparison 🙇🙇🙇🙇
please keep uploading awesome videos with great concept. thank you
You are the best Teacher. Thanks for creating such videos.
I just watched this and am amazed. Thanks
I'm half way, but just need to say that this tutorial is way to great to be free... Premium content, without question!
Excellent Explanations ! The first thing I do before watching your video is to like it ❤
Haha really appreciate the support! Glad these videos are so helpful :)
I really appriciate your content. I have been stuck in this for a long time. Thanks Again✌️
Thanks a ton man, you made it so simple to understand
excellent explanations, keep uploading, love from India
+
Very good tutorial. Certainly deserves more subscribers and likes.
Great Video Thnx a lot
for those who are super confused in the relations and then the code for relationships; I recommend watching this video again(and again) till your minds actually recognizes the pattern( you may take a break if you don't get it)
BEST OF LUCK
really helpful. The diagrams u draw and how you explain are rally helpful. thank you
I'm really glad those helped! I thought it might be distracting putting them in there so I'm glad they are working :)
Wow, great teacher!
Awesome as always bro
Hi Dennis, I love your way of Explanation. could you please also do a video about how to add foreignkey relationship in modelforms and render both in single template? Where foreignkey value can be choosen automatically while filling the form
You're a great teacher bro
This is super helpful I'm going to subscribe just because of this video.
So glad you found it helpful! I didn’t know if the drawings would make it more confusing but they seem to be helping :)
@@DennisIvy drawing did help us infact i understood that before building a long project, make a diagram .Thank you loving the course:-)
@@DennisIvy First of all, thanks for such amazing lectures you are taking.
How can I load data in my UI and apply slicers/filters on the data from .csv files in the dashboard. Secondly, how can I take user input on the dashboard and run an ML model in the background and refresh the dashboard. Any link for tutorials would be really great.
This guy is now my go-to expect on most topics in Django. Dennis Ivy += 1 sub.
Great explanation! Thank you!
Thanks! Hello from Kazakhstan!
very helpful bro!
Awesome!
Hey Dude, Thanks for the video. Its helping me spin my own Ticketing System with DRF and PSU! 20$/mo back into my business's pocket!
keep going amazing video sir thanks alot from somalia
That was clear, thank you 😊😊
five times i saw it is awesome
Great tutorial! Thanks!
From Morocco cheers mate.
Thank you Denis God bless you
thank you sir really great explanation with good example
Great explanations man. I've seen your in CodingPhase but never visited your channel. Now I'm a subscriber eheh.
感谢您的教程，对我的学习很有帮助！
Great teacher!! thank you
Great video coming from FastAPI where you need to be doing more sql than python sometimes I am very surprised how simple the relations are in Django. It’s really cool.
Excellent course
11/07/2020
Thanks Dennis, you saved me £30,000 from University. I really appreciated.
Super sir
You are Amazing Man
Thank you :)
Your videos are damn good; among the best I have watched on so many other youtube channels. Can you make videos on NodeJS and React Native as well?
@Dennis Ivy: First of all, thanks for such amazing lectures you are taking.
How can I load data in my UI and apply slicers/filters on the data from .csv files in the dashboard. Secondly, how can I take user input on the dashboard and run an ML model in the background and refresh the dashboard. Any link for tutorials would be really great.
Denis Ivy , at 11:06, you mention changing the tags selection to a multi-select checkbox. I can't find where you do that in this video, or the next. Where/how do you change that? Also how could I change a dropdown option to radio buttons. BTW, thank you for awesome content!
thank you
very helpful Contents
thank you a lot
damn bro u are the best
It's very good
I love this playlist and you really great at explaining the basics too!
I had one question how does Django only ask for customer name specifically in order model like it access name column only what if we want to access another column from customer in order model?
Thanks for the video. Very helpful! Does anybody know why the multiselect option is provided only on one side of the model in the admin panel if Many-To-Many is used? Theoretically it should be shown on both sides.
Boss of the Bosses
ty
Iam kind of taken up by javascript iisssh but I will catch up with series keep up the nice work bro
JavaScript is a blast! Enhances your capabilities with Django a tone too. Thanks for your constant support :)
Hi Dennis kindly make more interesting projects on Django
This may not be quite clear but i hope you understand:
I have created my class models with the relationships addressed in this video.But every class requires the foreign key class to be predefined above it,making the whole process an infinite loop.How do i tackle this?
Dennis, Do we use django database in production env or we use, database like Mysql in three tier arch with separate server. Can you say what is difference between in build django database and database servers
@Dennis Ivy.... Thanks for your journey of videos . It helping a lot. One more thing here you are adding selecting the Customer manually cause you are admin. But suppose when a customer orders a thing then in the order form can you plz show me way to select the user automatically to "Current User" where i have choices of users. thanks
Hi , do you have video explaining foreign key relations among tables of different databases or any hint on how to achieve that?
Can you please explain how to join tables (inner join) the joining tables has no foreign key relationships in django orm and once join is happen how to serialize the data to create API?
Hey I understand the concept of many to many and one to many, the way you implement it I also do the same but I am unable to understand how many to many relationship data will we stored because we have not created any intermediate table and also I am unable to find it in my database.
Can you do a follow up tutorial to this video explaining how to create a Model Form from the Order model?
Good morning , please is it possible to implement this many to many relationship and one to many relationship using mysql as my database
Instead of have choices via a dropdown, is it possible to have checkboxes and allow multiple options to be chosen?
manytomany field is used when we need to connect an object with many objects of another table,
Product can have multiple Tag like
ice cream is product and summer,food are Tags.
How should I make more user friendly to many to many field in admin panel? TabularInline is not good when too many values in many to many field.What should I use?
i had a doubt. can the orders be entered via the form given to the user too?
instead of manually entering them in the db
Thanks for the excellent content. Though on 2:00 I think one product (ball) can have both Sports Tag and Summer Tag but then BBQ Grill can't have summer as a tag. It is one to many not one to one. Am I right?
Please upload one video daily. spread the knowledge. thank you
Uploading two right now :) had to reshoot yesterday’s because I didn’t like the way it turned out.
@@DennisIvy thank you.
i am implementing QA forum in which i have a doubt suppose user ask a question and that question can be associated with many tags then how to implement its db design.please help@dennis Ivy
I tried to form a primary key that would contain two fields. If I understood right the info I found from web, Django does not support such feature and it has been so for a long time. What could be so difficult/overwhelming to prevent to implement a common feature like that?
The course is really great, but I have a question. Why we put the Tags class above the Product class? We can not just write it anywhere and access it? I mean why we need to have the order(not the Order class) in the code file? Is it just a preference from you? or it will not work otherwise?
When did you load the models.py? Not in this course, should we imported into this course from another?
Suggestion: press F7 and DOS window will display all the commands you entered previously
Thanks for this awesome series! I've saw your update using inline forms to add multiple order at the same time. But, Is it possible to add multiple porducts at the same order? How would you make the models for that? Can't figure out the best aproach to acomplish that.
Thank in advance.
use to many to many relationship.Basically each order can have index of one or more product
@12:15 Wait a minute, we don't have to makemigrations & migrate after changing the codes in models.py?
why to create a new customer user name and email? how can I directly import already existing users from table and display on page model customers!
soooo good.... nice. so if the Customer just cancel a ORDER that he or she made. the Order still on are database, as a Canceled ordered status, right??? sorry for my ENGLISH. but great Job.
Hello Dennis,i migrate my datebase to a postgres database and when i try to agregate a product it show me a error name error de sintaxis en o cerca de ON
Hey can anyone help? I'm creating a project similar to his. But instead of tags, I'm adding products to my order. which I can get working like he has but I want to add a quantity options as well. Is this possible??
I'm confused as to why you had to run migrate at 8:44 but not at 12:11, even though you made a change to the models.py file?
Dennis at 11:11 you mention that you would be change the ManyToManyField to a checkbox in the admin. Did you ever get to that?
Hey Dennis, I understand the logic behind one to many relationship for the customer but what if we have a large number of customers? don't you think a drop down feature would be slightly awkward?
that's just the default representations from admin-django if u want to search and get more out of field I thnk using the database in more helpful
@Dennis why i get error while opening source code ..error like this
Application error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command
heroku logs --tail
Very impressive explanation. But why don't you use cascade on delete so that the order made by a certain customer is also deleted when he is deleted to avoid orphaned entries