Pagination For Django - Django Wednesdays #18

[@Codemycom]

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[@harshdeepsingh9324]

please help i am getting nonetype for the page variable Code: p = Paginator(Post.objects.all(), 4) page = request.GET.get('page') trending_posts = p.get_page(page) nums = "a" * trending_posts.paginator.num_pages

[@harshdeepsingh9324]

I had tried to print the page and it is printing None please Help!!!!!

[@harshdeepsingh9324]

​ @Codemy.com please help

[@harshdeepsingh9324]

I tried to go to ?page=1 then only it is returning page 1 but the same page not different

[@harshdeepsingh9324]

Error: [22/Jun/2021 13:05:33] "GET / HTTP/1.1" 500 166112 1 Internal Server Error: / Traceback (most recent call last): File "D:\Website\env\lib\site-packages\django\core\handlers\exception.py", line 47, in inner response = get_response(request) File "D:\Website\env\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File "D:\Website oblogs\blog\views.py", line 24, in home return render(request, 'blog/home.html', context) File "D:\Website\env\lib\site-packages\django\shortcuts.py", line 19, in render content = loader.render_to_string(template_name, context, request, using=using) File "D:\Website\env\lib\site-packages\django\template\loader.py", line 62, in render_to_string return template.render(context, request) File "D:\Website\env\lib\site-packages\django\template\backends\django.py", line 61, in render return self.template.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 170, in render return self._render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 162, in _render return self.nodelist.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 938, in render bit = node.render_annotated(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 905, in render_annotated return self.render(context) File "D:\Website\env\lib\site-packages\django\template\loader_tags.py", line 150, in render return compiled_parent._render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 162, in _render return self.nodelist.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 938, in render bit = node.render_annotated(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 905, in render_annotated return self.render(context) File "D:\Website\env\lib\site-packages\django\template\loader_tags.py", line 62, in render result = block.nodelist.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 938, in render bit = node.render_annotated(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 905, in render_annotated return self.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 988, in render output = self.filter_expression.resolve(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 671, in resolve obj = self.var.resolve(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 796, in resolve value = self._resolve_lookup(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 858, in _resolve_lookup current = current() File "D:\Website\env\lib\site-packages\django\core\paginator.py", line 204, in previous_page_number return self.paginator.validate_number(self.number - 1) File "D:\Website\env\lib\site-packages\django\core\paginator.py", line 53, in validate_number raise EmptyPage(_('That page number is less than 1')) django.core.paginator.EmptyPage: That page number is less than 1 [22/Jun/2021 13:06:11] "GET /?page=1 HTTP/1.1" 500 166460 2 Internal Server Error: / Traceback (most recent call last): File "D:\Website\env\lib\site-packages\django\core\handlers\exception.py", line 47, in inner response = get_response(request) File "D:\Website\env\lib\site-packages\django\core\handlers\base.py", line 181, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File "D:\Website oblogs\blog\views.py", line 24, in home return render(request, 'blog/home.html', context) File "D:\Website\env\lib\site-packages\django\shortcuts.py", line 19, in render content = loader.render_to_string(template_name, context, request, using=using) File "D:\Website\env\lib\site-packages\django\template\loader.py", line 62, in render_to_string return template.render(context, request) File "D:\Website\env\lib\site-packages\django\template\backends\django.py", line 61, in render return self.template.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 170, in render return self._render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 162, in _render return self.nodelist.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 938, in render bit = node.render_annotated(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 905, in render_annotated return self.render(context) File "D:\Website\env\lib\site-packages\django\template\loader_tags.py", line 150, in render return compiled_parent._render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 162, in _render return self.nodelist.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 938, in render bit = node.render_annotated(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 905, in render_annotated return self.render(context) File "D:\Website\env\lib\site-packages\django\template\loader_tags.py", line 62, in render result = block.nodelist.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 938, in render bit = node.render_annotated(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 905, in render_annotated return self.render(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 988, in render output = self.filter_expression.resolve(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 671, in resolve obj = self.var.resolve(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 796, in resolve value = self._resolve_lookup(context) File "D:\Website\env\lib\site-packages\django\template\base.py", line 858, in _resolve_lookup current = current() File "D:\Website\env\lib\site-packages\django\core\paginator.py", line 204, in previous_page_number return self.paginator.validate_number(self.number - 1) File "D:\Website\env\lib\site-packages\django\core\paginator.py", line 53, in validate_number raise EmptyPage(_('That page number is less than 1')) django.core.paginator.EmptyPage: That page number is less than 1 [22/Jun/2021 13:06:23] "GET /?page=2 HTTP/1.1" 500 166460

[@hendmohamed3919]

@@harshdeepsingh9324 I also have the same problem,What is the solution please??

[@philippemele5334]

Hi there, I am getting an errror message saying request is not defined. Looking up on google, this problem seems to be related to Flask, however it does not seem flask is being used. Any pointers?

[@artaken7449]

Great tutorial thank you very much, But you gotta do something about the intro sound, It is really annoying specially when using headphones 0:05

[@_____vieve]

thank u so much mr white! this is really helpful 😸

[@shriyanshpurohit8706]

Great Sir!! Wanted to learn Pagination in Django. Thanks!

[@Codemycom]

Glad you liked it!

[@someshh7263]

Sir.. Waiting for django e-commerce website with class base views and adding items in cart using session..

[@Codemycom]

built one in visual studio 25 years ago lol

[@tamarapetrova8440]

Very well explained! I loved it. Saved me a whole bunch of time at work today.

[@Codemycom]

Happy to hear it!

[@abdelrhmanmohey535]

if i created any post or get request to filter my data is disappear as soon as i go to any other page

[@mr.marvel2787]

What ever I am searching u pop out and answer my question... Thank u a lot

[@Codemycom]

Awesome!

[@sthefanocarvalho2823]

Exactly what I needed. Thank you for the excellent content, as always :)

[@Codemycom]

Glad you enjoyed it!

[@dragonfire2926]

I tried this using POST method in a search form but it shows a value error ?

[@Codemycom]

What did you do differently from the video?

[@prasadmande8489]

Sir please make video on how to do periodic task in django for sending E-mail

[@Codemycom]

There's not a good way to natively send email in Django, you need to use a third party service.

[@prasadmande8489]

@@Codemycom i found celery for periodic task in django but unable to understand sir . Will you please teach me

[@Codemycom]

@@prasadmande8489 No, sorry

[@PrateekMehta92]

+1 on we don't want order of things to change (randomly) as we paginate. The use of ? operator (in order_by) is useful but for pagination we need a sequential order of items, python sorting for e.g. has a key parameter to determine the lambda to be used for making comparison between any two items, so basically, what I mean is for any kind of sorting over a set of items, there needs to be a predefined algorithm that evaluates each item using the given key, in case of say a table of "artist_singing_concerts" this key could be the concert date, and we can sort each item based on the most recent concert date, because that is what a visitor to the website might want to attend.

[@farhadtabrizi4878]

Hi I have tried pagination on the blog page view you taught in django which is a class based view (the homepage of blog), while implementing pagination the first page is ok but on next pages it losses template formatting, for instance the contents get out of "container-fluid" div. Would you please help me on this? Thanks

[@Mai_Tai_Meyers]

Very helpful! I'm working on CS50w and this was a great help on our homework assignment. Thank you!

[@Codemycom]

Happy to hear it!

[@aryariski00]

sir how the urls code for pagination?

[@Codemycom]

Everything you need is in the video

[@angiepaolamorenojaramillo1834]

Thanks for your video! i was only making a code for the pagination but i didn't use the for to iterate the objects that i've gotten in the views thanks to the Paginator(...objects.all(), 2). But you explained too well everything. Thank you so much

[@Codemycom]

Very welcome

[@canislatrans6606]

Congratulations John! great video, very clear and you have fresh happy style, cool bro. do we need to bring always all the objects to use the paginator? does it has sense to use the paginator if I have only the objects that belong to a specific page? thanks in advance :)

[@em0ji266]

Thank you very much! With your help, I was able to understand and solve this problem!

[@kay8379]

awesome video, i really aprecciate it

[@Codemycom]

Welcome!

[@ahmedghallab5342]

شكرا Thanks

[@Codemycom]

Welcome

[@vinaypoul]

Nice explaination. Please make a explain video on class-based views in Django.

[@Codemycom]

I have a whole playlist on that on the channel

[@roranautical6064]

Your channel and all your knowledge is carrying me through my entire Django project, so thankful for all your videos!

[@Codemycom]

Glad to hear it!

[@ameyamahadevgonal8130]

That's perfect

[@Codemycom]

glad you liked it!

[@venkateshgrow4463]

thanks for the video finally i got the output

[@moowmotors]

Thanks for lesson

[@Codemycom]

welcome

[@matheusandrade1059]

Amazing video

[@Codemycom]

Thanks!

[@joaonogaroli2165]

Hi, this is work with flask? ex: have a flask.core.paginator ? i'm searching but nothing...

[@Codemycom]

No, flask is different.

[@adhy612000151]

Thanks Sir!

[@Codemycom]

Welcome!

[@Boilnardo]

perfect

[@Codemycom]

thanks

[@odiljondjamalov8965]

thank you

[@Codemycom]

Welcome

[@kyrollssabry7808]

Thanks so much ,this helped me a lot 🤩

[@vigneshwarselva9276]

hello sir, it was great .. can u pls make a video on relational models and querying objects in models

[@Codemycom]

The videos in this playlist are all using relational models and querying objects...keep watching the playlist.

[@SCBealer]

Legend, thank you!

[@akifakif6031]

Thank you for keeping it short and simple.

[@Codemycom]

yep

[@sumanchakravarty7712]

can you suggest a way to monitor daily traffic?

[@Codemycom]

google analytics

[@sithuhtun3609]

This channel is the best for python!

[@Codemycom]

Thanks!

[@NULL-xq2qz]

this was helpful, thanks!

[@Codemycom]

welcome!

[@hoxas]

Nice 🤩 thank you

[@Codemycom]

welcome!

[@Pheasant303]

Great video, super helpful

[@Codemycom]

Glad you think so!

[@yunasan8755]

Help a lot! thank you!

[@Codemycom]

Welcome!

[@krebill]

love you

[@Codemycom]

thanks!

[@mohammadaliakbari269]

great!!!thanks

[@Codemycom]

Sure thing!

[@Medu7a]

Thanks

[@Codemycom]

Welcome

[@ammonjerro396]

One of the best teacher in web!

[@Codemycom]

Thanks!

[@johngiangrande2996]

Great job, as usual, John!

[@Codemycom]

thanks!

[@kartikeysrivastava9657]

watched three video before this but the way you clear the concept of pagination is just cool.

[@Codemycom]

Thanks! Glad you liked it!