{"id":448,"date":"2017-03-27T10:32:20","date_gmt":"2017-03-27T02:32:20","guid":{"rendered":"https:\/\/www.jarvisw.com\/?p=448"},"modified":"2017-03-27T10:32:20","modified_gmt":"2017-03-27T02:32:20","slug":"%e4%bd%bf%e7%94%a8flasksqlalchemy%e6%93%8d%e4%bd%9c%e6%95%b0%e6%8d%ae%e5%ba%93%e6%8a%a5%e9%94%99is-already-attached-to-session%e7%9a%84%e8%a7%a3%e5%86%b3%e5%8a%9e%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.jarvisw.com\/?p=448","title":{"rendered":"\u4f7f\u7528flask+sqlalchemy\u64cd\u4f5c\u6570\u636e\u5e93\u62a5\u9519:is already attached to session\u7684\u89e3\u51b3\u529e\u6cd5"},"content":{"rendered":"<p>\u7b2c\u4e00\u6b21\u7528flask+sqlalchemy\uff0c\u4e4b\u524d\u89e3\u51b3\u4e86\u914d\u7f6e\u4e4b\u7c7b\u7684\u95ee\u9898\uff0c\u4eca\u5929\u5728\u7528ORM\u8fdb\u884cCURD\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u5728\u89c6\u56fe\u51fd\u6570\u91cc\u64cd\u4f5c\u6570\u636e\u5e93\u7684\u65f6\u5019\u4f1a\u62a5\u9519\uff1a<br \/>\nsqlalchemy.exc.InvalidRequestError: Object &#8221; is already attached to session &#8216;1&#8217; (this is &#8216;2&#8217;)<br \/>\n\u6211\u7684\u89c6\u56fe\u63a7\u5236\u5668\u662f\u8fd9\u6837\u5199\u7684\uff1a<\/p>\n<pre class=\"brush: python; title: ; notranslate\" title=\"\">\r\n@app.route('\/deldevice.json')\r\ndef deldevice():\r\n    deviceid = request.args.get('id');\r\n    dev = models.Device.query.filter_by(id=deviceid).first()\r\n    db.session.delete(dev)\r\n    db.session.commit()\r\n    return redirect(&quot;\/&quot;)\r\n<\/pre>\n<p>\u6267\u884c\u5230db.session.delete(dev)\u7684\u65f6\u5019\u5c31\u4f1a\u51fa\u73b0\u4e0a\u9762\u7684\u62a5\u9519\u4e86\uff0c\u540e\u6765\u7f51\u4e0a\u67e5\u9605\u4e86\u4e00\u4e9b\u8d44\u6599\uff0c\u5927\u6982\u660e\u767d\u4e86\u539f\u7406\uff0c\u7531\u4e8e\u89c6\u56fe\u51fd\u6570\u662f\u4e00\u4e2a\u591a\u7ebf\u7a0b\u6267\u884c\u7684\u51fd\u6570\uff0c\u5982\u679c\u76f4\u63a5\u4f7f\u7528\u6587\u4ef6\u4e2d\u7684db\u53d8\u91cf\uff0c\u4f1a\u9020\u6210\u4f1a\u8bdd\u7ed1\u5b9a\u6df7\u4e71\uff0c\u5c31\u4f1a\u62a5\u8fd9\u4e2a\u9519\u8bef\uff0c\u8fd9\u662f\u5bf9\u7a0b\u5e8f\u6267\u884c\u6d41\u7a0b\u7406\u89e3\u4e0d\u5f53\u9020\u6210\u7684\uff0c\u90a3\u5982\u4f55\u89e3\u51b3\u5462\uff0c\u6709\u4e00\u4e2a\u529e\u6cd5\u5c31\u662f\u5728\u51fd\u6570\u5185\u90e8import\u53d8\u91cf\uff0c\u5c31\u6ca1\u6709\u95ee\u9898\u4e86\uff0c\u6bd4\u5982\u6539\u6210\u8fd9\u6837\uff1a<\/p>\n<pre class=\"brush: python; title: ; notranslate\" title=\"\">\r\n@app.route('\/deldevice.json')\r\ndef deldevice():\r\n    from xxxx import db as thisdb\r\n    deviceid = request.args.get('id');\r\n    dev = models.Device.query.filter_by(id=deviceid).first()\r\n    thisdb.session.delete(dev)\r\n    thisdb.session.commit()\r\n    return redirect(&quot;\/&quot;)\r\n<\/pre>\n<p>\u6d4b\u8bd5\u4e0d\u62a5\u9519\uff0c\u6b63\u5e38\u6267\u884c\u3002<\/p>\n<p>\u5f53\u7136\u8fd9\u4e2a\u9519\u8bef\u4e5f\u544a\u8bc9\u6211\u4eec\u4e00\u4e2a\u9053\u7406\uff0c\u5c3d\u91cf\u5c06\u529f\u80fd\u6a21\u5757\u5316\uff0c\u4e0d\u8981\u628a\u592a\u591a\u4e8b\u52a1\u4ee3\u7801\u5199\u5728\u89c6\u56fe\u63a7\u5236\u5668\u91cc\uff0c1\u4e0d\u65b9\u4fbf\u7ef4\u62a4\uff0c2\u4e5f\u6709\u53ef\u80fd\u9020\u6210\u4e00\u4e9b\u4e0d\u53ef\u9884\u6599\u7684\u95ee\u9898\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b2c\u4e00\u6b21\u7528flask+sqlalchemy\uff0c\u4e4b\u524d\u89e3\u51b3\u4e86\u914d\u7f6e\u4e4b\u7c7b\u7684\u95ee\u9898\uff0c\u4eca\u5929\u5728\u7528ORM\u8fdb\u884cCURD\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u5728\u89c6 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[88,89,92,91,57],"class_list":["post-448","post","type-post","status-publish","format-standard","hentry","category-web","tag-flask","tag-orm","tag-session","tag-sqlalchemy","tag-web"],"_links":{"self":[{"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=\/wp\/v2\/posts\/448","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=448"}],"version-history":[{"count":1,"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=\/wp\/v2\/posts\/448\/revisions"}],"predecessor-version":[{"id":449,"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=\/wp\/v2\/posts\/448\/revisions\/449"}],"wp:attachment":[{"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=448"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=448"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jarvisw.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=448"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}