在Mongo中嵌套$ pull命令

Question

我試圖從多個數組中刪除一個值，而不必發出多個Mongo命令。我必須有我的語法不正確，任何幫助將不勝感激。

當我嘗試：

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), 
     "}" 
     ); 

，如果我把它簡化到只有它的工作原理如下失敗：

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

Answer 1

的$pull在它後面的文件進行操作。見MongoDB Documentation on $pull。我從來沒有見過的BCON符號之前了，所以我可能是錯的，但如果我理解正確的話，我相信，你的代碼創建的文檔應該是這樣的：

{ 
    $pull: { "files.$.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，我認爲你想看起來像這樣的東西（我還沒有測試過）：

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), 
    "}" 
    );