{"id":150,"date":"2009-09-12T19:30:32","date_gmt":"2009-09-12T17:30:32","guid":{"rendered":"http:\/\/j-mad.com\/blog\/?p=150"},"modified":"2009-10-04T22:20:24","modified_gmt":"2009-10-04T20:20:24","slug":"lalgebre-du-q-et-du-queryset","status":"publish","type":"post","link":"https:\/\/j-mad.com\/blog\/2009\/09\/12\/lalgebre-du-q-et-du-queryset\/","title":{"rendered":"L&#8217;alg\u00e8bre du Q (et du queryset)"},"content":{"rendered":"<p>Oui, je sais, mon titre de billet n&#8217;est pas des plus fin.. Tans pis, c&#8217;est la faute au surmenage.<\/p>\n<p>J&#8217;avais d\u00e9j\u00e0 parl\u00e9 des objets Q dans un pr\u00e9c\u00e9dent billet. Pour m\u00e9moire les objets Q sont des objets django qui permettent de faire de filtrer des requ\u00eates BD d&#8217;une fa\u00e7on plus pouss\u00e9e qu&#8217;en simplement chainant des appels \u00e0 filter.<\/p>\n<h1>L&#8217;alg\u00e8bre des Q<\/h1>\n<p>Les op\u00e9rateurs ET (&amp;) et OU ( | ) fonctionne sur les objects Q. On peut les chainer, en faire des expressions complexes en parenth\u00e9sant sans aucun probl\u00e8me.<\/p>\n<h1>L&#8217;alg\u00e8bre des queryset<\/h1>\n<p>Les queryset sont des objets it\u00e9rable qui sont renvoy\u00e9s, par, entre autre, la fonction filter et qui stockent le r\u00e9sultat d&#8217;une requ\u00eate BD. On s&#8217;en sert aussi pour remplir les diff\u00e9rents composants &#8216;\u00e0 choix&#8217; d&#8217;un formulaire (selectlist,etc&#8230; ).<\/p>\n<p>On ne peut pas concat\u00e9ner deux queryset comme on pourrait le faire avec deux listes avec par exemple L1 + L2. Mais les queryset supporte les op\u00e9rations logique. On peut donc l\u00e0 aussi faire des OU (ce qui revient \u00e0 les concat\u00e9ner) et des ET pour trouver l&#8217;intersection entre deux queryset.<\/p>\n<p>Et c&#8217;est, plus que bien utile.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Oui, je sais, mon titre de billet n&#8217;est pas des plus fin.. Tans pis, c&#8217;est la faute au surmenage. J&#8217;avais d\u00e9j\u00e0 parl\u00e9 des objets Q dans un pr\u00e9c\u00e9dent billet. Pour m\u00e9moire les objets Q sont des objets django qui permettent de faire de filtrer des requ\u00eates BD d&#8217;une fa\u00e7on plus pouss\u00e9e qu&#8217;en simplement chainant des &hellip; <a href=\"https:\/\/j-mad.com\/blog\/2009\/09\/12\/lalgebre-du-q-et-du-queryset\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">L&#8217;alg\u00e8bre du Q (et du queryset)<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[6],"tags":[99,98],"class_list":["post-150","post","type-post","status-publish","format-standard","hentry","category-django","tag-django","tag-python"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta 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