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Django - Qiita Advent Calendar 2017 - Qiita
The Qiita Advent Calendar 2017 is supported by the following companies, organizations, and services.
Django ORM ã® select_related, prefetch_related ã®æŒ™å‹•ã‚’詳ã—ã調ã¹ã¦ã¿ãŸ - akiyoko blog
Django ORM ã® QuerySet ã«ã¯ã€select_related ãŠã‚ˆã³ prefetch_related ã¨ã„ã†ãƒ¡ã‚½ãƒƒãƒ‰ãŒã‚ã‚Šã¾ã™ãŒã€ã‚¤ãƒžã‚¤ãƒä½¿ã„å‹æ‰‹ãŒã‚ˆã分ã‹ã‚‰ãªã‹ã£ãŸã‚Šã—ã¾ã™ã€‚ å…¬å¼ãƒ‰ã‚ュメントã«ã¯ã“ã†æ›¸ã„ã¦ã‚ã‚Šã¾ã™ãŒã€ select_related works by creating an SQL join and including the fields of the related object in the SELECT statement. For this reason, select_related gets the related objects in the same database query. However, to avoid the much larger result set that would result from joining a
djangoã§ãƒ˜ãƒ†ãƒãªãƒªã‚¹ãƒˆã®prefetch (generic foreign keyã®prefetch_related) - podhmo's diary
djangoã§ãƒ˜ãƒ†ãƒãªãƒªã‚¹ãƒˆã®prefetch djangoã§ãƒ˜ãƒ†ãƒãªãƒªã‚¹ãƒˆã®prefetch。ã§ããªã„ã¨æ€ã£ãŸã‚‰æ™®é€šã«å‡ºæ¥ãŸã®ã§ã‚ã‚Šã¨ã³ã£ãã‚Šã—ãŸã®ã§è¨˜äº‹ã«ã—ã¦ã¿ãŸã€‚ ヘテãƒãªãƒªã‚¹ãƒˆ? ã“ã“ã§ã®ãƒ˜ãƒ†ãƒãªãƒªã‚¹ãƒˆã¨è¨€ã†ã®ã¯ä»¥ä¸‹ã®ã‚ˆã†ãªãƒªã‚¹ãƒˆã‚’指ã—ã¦ã„る。 xs = [A(), B(), A(), A(), B(), C()] ã¤ã¾ã‚‹ã¨ã“ã‚１ã¤ã®åž‹ã®ã‚ªãƒ–ジェクトã®ãƒªã‚¹ãƒˆã§ã¯ãªã複数ã®åž‹ãŒæ··åœ¨ã—ãŸãƒªã‚¹ãƒˆã®ã‚ˆã†ãªã‚‚ã®ã‚’指ã—ã¦ã„る。ã“ã®ã‚ˆã†ãªãƒªã‚¹ãƒˆã¯è¤‡æ•°ã®ã“ã¨ãªã‚‹ã‚¢ã‚¤ãƒ†ãƒ ã‚’è¦ç´ ã¨ã—ã¦æŒã¤ã‚¿ã‚¤ãƒ ラインã®ã‚ˆã†ãªãƒšãƒ¼ã‚¸ã‚’作ã‚ã†ã¨ã—ãŸæ™‚ã«å¿…è¦ã«ãªã‚‹ã€‚例ãˆã°ã€ã“ã®ã‚ˆã†ãªã‚‚ã®ã‚’generic foreignkeyを使ã£ã¦ä»¥ä¸‹ã®æ§˜ã«å®Ÿè£…ã™ã‚‹ã¨ã„ã†ã“ã¨ãŒã‚ã‚‹ã‹ã‚‚ã—ã‚Œãªã„。 from django.contrib.contenttypes.fields import GenericForeignKey from dj
djangoã§ã®é›†è¨ˆã¯è¾›ã„ã¨ã„ã†è©± -- ORMã¯ç”¨æ³•ãƒ»ç”¨é‡ã‚’守ã£ã¦æ£ã—ã使ã„ã¾ã—ょㆠ- podhmo's diary
djangoã§ã®é›†è¨ˆã¯è¾›ã„ã¨ã„ã†è©± -- ORMã¯ç”¨æ³•ãƒ»ç”¨é‡ã‚’守ã£ã¦æ£ã—ã使ã„ã¾ã—ょㆠdjangoã®ORMã®æ©Ÿèƒ½ã®ä¸è¶³ã«ã¶ã¡å½“ãŸã‚Šè¾›ã„ã¨ã„ã†è©±ã€‚別ã®è¨€ã„方をã™ã‚‹ã¨ã€ORMã¯ç”¨æ³•ãƒ»å®¹é‡å®ˆã£ã¦æ£ã—ã使ã„ã¾ã—ょã†ã¨ã„ã†æ„Ÿã˜ã«ãªã‚‹ã‹ã‚‚ã—ã‚Œãªã„。 ã¯ã˜ã‚㫠以下ã®ã‚ˆã†ãªæƒ…å ±ã‚’å¹´é½¢ã§ä¸¸ã‚ãŸå€¤ã§é›†è¨ˆã—ã¦ãƒ’ストグラムã®ã‚ˆã†ãªã‚‚ã®ã‚’作りãŸã„。 åå‰ å¹´é½¢ foo 10 bar 15 boo 20 çµæžœ rank c 1 2 2 1 SQLã§ã¯é ‘張れã°ã©ã†ã«ã‹ãªã‚‹ 集計をã—ãŸã„時ãªã©ä½•ã‚‰ã‹ã®æ¼”ç®—ã®çµæžœã§ GROUP BY ã—ãŸã„時ãªã©çµæ§‹ã‚る。ãŠãらããã£ã¨ã‚る。 例ãˆã°ãƒ’ストグラム的ãªã‚‚ã®ã‚’作æˆã—ãŸã„時ãªã©ã€‚SQLã§ã‚れ㰠CASEã¨WHENを書ã連ãã‚‹ã“ã¨ã‚’æ°—ã«ã—ãªã‘ã‚Œã°ã©ã†ã«ã‹ãªã‚‹ã€‚ sqlite> create table person(name string primary key, age in
Djangoã®ãƒ¦ãƒ¼ã‚¶èªè¨¼ã¾ã¨ã‚ - c-bata web
追記: 使用ã—ã¦ã„ã‚‹Djangoã®ãƒãƒ¼ã‚¸ãƒ§ãƒ³ã‚’ã¯ã˜ã‚ã€ã„ãã¤ã‹å¤ããªã£ã¦ãã¦ã„る点ãŒã‚ã‚Šã¾ã™ã€‚DjangoCongress JP 2018ã§èªè¨¼ã«é–¢ã™ã‚‹ç™ºè¡¨ã‚’è¡Œã£ãŸã®ã§ã™ãŒã€ãƒ–ãƒã‚°è¨˜äº‹ã‚‚用æ„ã—ã¦ã„ã¾ã™ã€‚ãã¡ã‚‰ã‚’å‚ç…§ã—ã¦ãã ã•ã„ nwpct1.hatenablog.com 追記終ã‚ã‚Š Djangoã§ãƒ¦ãƒ¼ã‚¶èªè¨¼ã‚’ã—ãŸã‹ã£ãŸã®ã§èª¿ã¹ã¦ã¿ã‚‹ã¨ï¼ŒDjangoã§ã¯UserモデルãŒã¯ã˜ã‚ã‹ã‚‰ç”¨æ„ã•ã‚Œã¦ã„るらã—ã„．ãã“ã§Djangoã®æä¾›ã™ã‚‹æ©Ÿèƒ½ã‚’ãã®ã¾ã¾ä½¿ã£ã¦ãƒã‚°ã‚¤ãƒ³ãƒ»ãƒã‚°ã‚¢ã‚¦ãƒˆã‚’実装ã—ã¦ã¿ãŸï¼Ž ã•ã‚‰ã«èª¿ã¹ã¦ã¿ã‚‹ã¨python-social-authã¨ã„ã†ãƒ©ã‚¤ãƒ–ラリを使ãˆã°ã€Twitterã‚„Facebook，Googleã€Githubç‰ã®ã‚¢ã‚«ã‚¦ãƒ³ãƒˆã‚’使ã£ãŸOAuthèªè¨¼ãŒç°¡å˜ã«å®Ÿè£…ã§ãã‚‹ã¿ãŸã„ãªã®ã§ãれも試ã—ã¦ãŠã． ソースコードã¯Githubã§å…¬é–‹ã—ã¦ã¾ã™ï¼Ž https://github.com/c-
Django ImageField change file name on upload
Upon saving me model 'Products' I would like the uploaded image to be named the same as the pk for example 22.png or 34.gif I don't want to change the format of the image just the name. How can this be done? example of my model so far below... image = models.ImageField( upload_to="profiles", height_field="image_height", width_field="image_width", null=True, blank=True, editable=True, help_text="Pr
How to create an object for a Django model with a many to many field?
You cannot create m2m relations from unsaved objects. If you have the pks, try this: sample_object = Sample() sample_object.save() sample_object.users.add(1,2) Update: After reading the saverio's answer, I decided to investigate the issue a bit more in depth. Here are my findings. This was my original suggestion. It works, but isn't optimal. (Note: I'm using Bars and a Foo instead of Users and a S
"gettext()" vs "gettext_lazy()" in Django
I have a question about using ugettext and gettext_lazy() for translations. I learned that in models I should use gettext_lazy(), while in views ugettext. But are there any other places, where I should use gettext_lazy() too? What about form definitions? Are there any performance diffrences between them? Edit: And one more thing. Sometimes, instead of gettext_lazy(), gettext_noop() is used. As doc
Welcome — Django MongoDB Engine
Table Of Contents Welcome Contents ⚠Documentation version These are the Git version docs. Docs for 0.4 (PyPI) are here. Help out! To make this documentation even better, we'd love to receive your feedback and suggestions for improvement! Welcome¶ Django MongoDB Engine is a MongoDB backend for Django, the Python Web framework for perfectionists with deadlines. This documentation is split into seve
RESTfulãªAPIを構æˆã™ã‚‹ã®ã«ç‰¹åŒ–ã—ãŸã‚¦ã‚§ãƒ–フレームワークã¨ã‹(Pythonç·¨) - laiso
ã“ã‚“ã°ã‚“ã¯ã€Pythonç•Œã®ã²ãã“ã‚‚ã‚Šã§ã™ã€‚ モãƒã‚¤ãƒ«ã‚¢ãƒ—リケーションã®ãƒãƒƒã‚¯ã‚¨ãƒ³ãƒ‰é–‹ç™ºãªã©ã§RESTful APIã‚’å…ˆãšè¨è¨ˆã™ã‚‹å¿…è¦ãŒã‚ã‚‹ã¨ã„ã£ãŸã‚±ãƒ¼ã‚¹ãªã‚“ã‹ã§ä¾¿åˆ©ã«åˆ©ç”¨ã§ããã†ãªã€æ—¢å˜ã®ã‚¦ã‚§ãƒ–アプリケーションフレームワークã®ä»•çµ„ã¿ã‹ã‚‰RESTfulãªAPI構æˆã«ç‰¹åŒ–ã—ã¦ãƒ‘ッケージングã•ã‚ŒãŸã‚µãƒ–フレームワークãŒã„ã‚ã„ã‚出ã¦ãã¦ã„ã‚‹ã®ã§èª¿ã¹ã¾ã—ãŸã€‚ フレームワークã«å¿…è¦ãªæ©Ÿèƒ½ãã‚‚ãもフレームワークã«ã©ã‚“ãªæ©Ÿèƒ½ãŒå¿…è¦ãªã®ã‹ã¨ã„ã†ã®ã‚’Choosing an API framework for Django ã‹ã‚‰æŠœç²‹ã€‚ ページãƒãƒ¼ã‚·ãƒ§ãƒ³(アイテムã®å…ˆé ã‹ã‚‰10件ãŒ1ページ目→11ã‹ã‚‰20ãŒ2ページ目ãªã©) データã®æŠ•ç¨¿ã¨ãƒãƒªãƒ‡ãƒ¼ã‚·ãƒ§ãƒ³ メタデータã®ç”Ÿæˆ(result, count, next ã¿ãŸã„ãªè¦ç´ をレスãƒãƒ³ã‚¹ã«å«ã‚る為ã®ã—ãã¿ã®ã“ã¨ã‹ãª?) レスãƒãƒ³ã‚¹ã®ãƒãƒ³ãƒ‰ãƒªãƒ³ã‚° ã‚ャッシュ データã®
Djangoã‹Pyramidã‹!? ç«èŠ±æ•£ã‚‹ãƒ‘ãƒãƒ«ã«æ³¨ç›®ã®PyCon JPレãƒãƒ¼ãƒˆ ï¼ ï¼ IT
2012/09/24 PythonコミュニティãŒé–‹å‚¬ã™ã‚‹ã€ŒPyCon JP 2012ã€ãŒã€æ±äº¬ã®ç”£æ¥æŠ€è¡“大å¦é™¢å¤§å¦ã§2012å¹´9月15æ—¥ã‹ã‚‰17æ—¥ã¾ã§é–‹å‚¬ã•ã‚ŒãŸã€‚PyCon JPã¯ä¸–ç•Œä¸ã§è¡Œã‚ã‚Œã¦ã‚‹Python Conference（PyCon）ã®æ—¥æœ¬ç‰ˆã§ã€ä»Šå›žã¯2回目。「ã¤ãªãŒã‚‹Pythonã€ã®ãƒ†ãƒ¼ãƒžã®ã‚‚ã¨åˆã®ä½µè¨ã‚¤ãƒ™ãƒ³ãƒˆã‚‚開催ã•ã‚Œã€æ±äº¬é–‹å‚¬ã«ã‚‚é–¢ã‚らãšãƒ¨ãƒ¼ãƒãƒƒãƒ‘ã€ã‚ªãƒ¼ã‚¹ãƒˆãƒ©ãƒªã‚¢ã€å°æ¹¾ãªã©å„国ã®PythonistaãŒé›†ã†ãªã©ã€å‰å¹´ã®ã»ã¼å€ã®480人を超ãˆã‚‹å‚åŠ è€…ãŒé›†ã¾ã‚Šç››ã‚Šä¸ŠãŒã£ãŸï¼ˆãƒ¬ãƒãƒ¼ãƒˆï¼šã‚¿ã‚¤ãƒ インターメディア・飯野å“見） PyCon JP本編ã§ã¯Python製サービスã®äº‹ä¾‹ã¨ã—ã¦å†™çœŸå…±æœ‰ã‚µãƒ¼ãƒ“ス「SnapDishã€ã‚„NIFTY Cloudã«æ–°ã—ãåŠ ã‚ã£ãŸPaaSã®ã€ŒC4SAã€ã®ã‚¢ãƒ¼ã‚テクãƒãƒ£ç´¹ä»‹ã€Pythonã®éžåŒæœŸIOフレームワークã€ã€ŒGeventã€ã¨ã€ŒTornadoã€ã®ç™ºè¡¨ã€P
Django REST framework
Home Home Tutorial API Guide Topics Community Django REST Framework Django REST framework is a powerful and flexible toolkit for building Web APIs. Some reasons you might want to use REST framework: The Web browsable API is a huge usability win for your developers. Authentication policies including packages for OAuth1a and OAuth2. Serialization that supports both ORM and non-ORM data sources. Cust
Django Class-based views 㧠JSON を返㙠- æ±äº¬ãƒŠãƒ³ãƒˆã‚«ã‚«ãƒ³ãƒˆã‚«
ãã®ã†ã®æ·±å¤œã«æ€¥ã«æ€ã„ç«‹ã£ãŸã®ã§è‰²ã€…書ã„ã¦ã„ãã¾ã™ï¼æœ€è¿‘ Django ã®æ—¥æœ¬èªžæƒ…å ±å°‘ãªã™ãŽã‚‹ã¨æ€ã‚“ã§ã€ã¡ã‚‡ã£ã¨ã—ãŸã“ã¨ã§ã‚‚ã“ã‚Œã‹ã‚‰ãƒ–ãƒã‚°ã„ã£ã±ã„書ã„ã¦ã„ãã¾ã™ã€‚— Yoichi Fujimoto (@wozozo) February 5, 2012 Django 1.3 ã‹ã‚‰ Class-based views ãŒå…¥ã£ã¦ mixin ã¨ã‹ã—ã¾ãã‚Šã§ã‚ã‚“ã©ãã•ããªã£ãŸãªãƒ¼ã¨æ€ã£ã¦ã¾ã™ã€‚ã§ã‚‚使ãˆã‚‹ã¨ä¾¿åˆ©ãªã“ã¨ã‚‚多ã„ã®ã§ã€ã¨ã‚Šã‚ãˆãš JSON を返㙠view を書ã„ã¦ã¿ã¾ã—ょã†ãƒ¼ã€‚JSONResponseMixin ã¯ãƒ‰ã‚ュメントã‹ã‚‰ã®ã‚³ãƒ”ペã§ã™ã€‚ https://docs.djangoproject.com/en/1.3/topics/class-based-views/#more-than-just-html from django import http from django.u
Backbone.js with Django 1.5 | Eventual Consistency
Backbone.js and other client-side MV* frameworks are a relatively new paradigm in designing and building rich web applications. Since this transition is still ongoing, most serious server-side frameworks are just now catching up to this trend. Django included. This is not a critique on Django - most sites and apps are still built in the "traditional" way. Backbone and friends are not a one-size-fi
Cross Site Request Forgery protection | Django documentation
Cross Site Request Forgery protection¶ The CSRF middleware and template tag provides easy-to-use protection against Cross Site Request Forgeries. This type of attack occurs when a malicious website contains a link, a form button or some JavaScript that is intended to perform some action on your website, using the credentials of a logged-in user who visits the malicious site in their browser. A rel
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