在Mongo中嵌套$ pull命令

我试图从多个数组中删除一个值，而不必发出多个Mongo命令。我必须有我的语法不正确，任何帮助将不胜感激。

当我尝试：

update = BCON_NEW("$pull", 
     "{", 
      "files.$.like", BCON_UTF8 (account_id), 
     "}", 
     "{", 
      "files.$.hate", BCON_UTF8 (account_id), 
     "}", 
     "{", 
      "files.$.love", BCON_UTF8 (account_id), 
     "}", 
     "{", 
      "files.$.funny", BCON_UTF8 (account_id), 
     "}", 
     "{", 
      "files.$.sad", BCON_UTF8 (account_id), 
     "}", 
     "{", 
      "files.$.anger", BCON_UTF8 (account_id), 
     "}", 
     "{", 
      "files.$.kiss", BCON_UTF8 (account_id), 
     "}" 
     );

，如果我把它简化到只有它的工作原理如下失败：

update = BCON_NEW("$pull", 
     "{", 
      "files.$.like", BCON_UTF8 (account_id), 
     "}" 
     );

来源

2017-07-17 Steven Carlson

的$pull在它后面的文件进行操作。见MongoDB Documentation on $pull。我从来没有见过的BCON符号之前了，所以我可能是错的，但如果我理解正确的话，我相信，你的代码创建的文档应该是这样的：

{ 
    $pull: { "files.$.like": BCON_UTF8 (account_id) } //Here's the end of your $pull document, 
    { "files.$.hate": BCON_UTF8 (account_id) }, 
    { "files.$.love": BCON_UTF8 (account_id) }, 
    ... 
},

相反，我认为你想看起来像这样的东西（我还没有测试过）：

update = BCON_NEW("$pull", 
    "{", 
     "files.$.like", BCON_UTF8 (account_id), 
     "files.$.hate", BCON_UTF8 (account_id), 
     "files.$.love", BCON_UTF8 (account_id), 
     "files.$.funny", BCON_UTF8 (account_id), 
     "files.$.sad", BCON_UTF8 (account_id), 
     "files.$.anger", BCON_UTF8 (account_id), 
     "files.$.kiss", BCON_UTF8 (account_id), 
    "}" 
    );

来源

2017-07-20 04:19:59 Kdawg

在Mongo中嵌套$ pull命令

回答

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