{"id":7496,"date":"2023-05-25T09:03:23","date_gmt":"2023-05-25T01:03:23","guid":{"rendered":"https:\/\/www.5x44.cn\/?p=7496"},"modified":"2023-05-25T09:03:36","modified_gmt":"2023-05-25T01:03:36","slug":"django%e4%b8%ad%e7%9a%84f%e3%80%81q%e8%a1%a8%e8%be%be%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=7496","title":{"rendered":"django\u4e2d\u7684F()\u3001Q()\u8868\u8fbe\u5f0f"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">django\u4e2d\u7684F()\u8868\u8fbe\u5f0f\u7528\u4e8e\u5728\u540c\u4e00\u6a21\u578b\u4e2d\u6bd4\u8f83\u4e24\u4e2a\u4e0d\u540c\u7684\u5b57\u6bb5\u3002<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u524d\u8981\u5148\u5bfc\u5165\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">from django.db.models import F<\/mark><\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">F()\u7684\u53c2\u6570\u6a21\u578b\u7684\u5b57\u6bb5\u540d\uff0c\u5982\uff1aF(&#8220;name&#8221;)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Entry.objects.filter(authors__name=F(\"blog__name\"))\nEntry.objects.filter(mod_date__gt=F(\"pub_date\")+timedelta(days=3))<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">django\u4e2d\u7528Q()\u8868\u8fbe\u5f0f\u8868\u793a\u7531or\u8bed\u53e5\u8fde\u63a5\u7684\u67e5\u8be2<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u524d\u8981\u5148\u5bfc\u5165\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-cyan-blue-color\">from django.db.models import Q<\/mark><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Q(question__startswith=\"who\") |  Q(pub_date__year=2005)<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">\u53cc\u4e0b\u5212\u7ebf\u201c__\u201d\u5728django\u4e2d\u7528\u4e8e\u6a21\u578b\u7684\u68c0\u7d22<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5982\uff1a\u8868\u540d\u548c\u5b57\u6bb5\u540d\u7684\u94fe\u63a5\uff0c\u4ee5\u53ca\u4e00\u4e9b\u64cd\u4f5c\u65b9\u6cd5\u7684\u94fe\u63a5<\/p>\n","protected":false},"excerpt":{"rendered":"<p>django\u4e2d\u7684F()\u8868\u8fbe\u5f0f\u7528\u4e8e\u5728\u540c\u4e00\u6a21\u578b\u4e2d\u6bd4\u8f83\u4e24\u4e2a\u4e0d\u540c\u7684\u5b57\u6bb5\u3002 \u4f7f\u7528\u524d\u8981\u5148\u5bfc\u5165\uff1a F()\u7684\u53c2\u6570\u6a21\u578b\u7684\u5b57\u6bb5\u540d\uff0c\u5982\uff1aF(&#8220;name&#8221;) d&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/www.5x44.cn\/?p=7496\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[52],"tags":[],"class_list":["post-7496","post","type-post","status-publish","format-standard","hentry","category-django"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/7496","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7496"}],"version-history":[{"count":2,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/7496\/revisions"}],"predecessor-version":[{"id":7498,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/7496\/revisions\/7498"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}