MongoDB Aggregate正則表達式匹配或全文搜索返回整個文檔

Question

Ex。記錄

[ 
    { 
    "_id": "5528cfd2e71144e020cb6494", 
    "__v": 11, 
    "Product": [ 
       { 
       "_id": "5528cfd2e71144e020cb6495", 
       "isFav": true, 
       "quantity": 27, 
       "price": 148, 
       "description": "100g", 
       "brand": "JaldiLa", 
       "name": "Grapes", 
       "sku": "GRP" 
       }, 
       { 
       "_id": "552963ed63d867b81e18d357", 
       "isFav": false, 
       "quantity": 13, 
       "price": 290, 
       "description": "100g", 
       "brand": "JaldiLa", 
       "name": "Apple", 
       "sku": "APL" 
       } 
      ], 
    "brands": [ 
      "Whole Foods", 
      "Costco", 
      "Bee's", 
      "Masons" 
      ], 
    "sku": "FRT", 
    "name": "Fruits" 
    } 
] 

我的貓鼬函數從AngularJS返回查詢（http://localhost:8080/api/search?s=）

router.route('/search') 
    .get(function(req, res) { 
     Dept.aggregate(
       { $match: { $text: { $search: req.query.s } } }, 
       { $project : { name : 1, _id : 1, 'Product.name' : 1, 'Product._id' : 1} }, 
       { $unwind : "$Product" }, 
       { $group : { 
        _id : "$_id", 
        Category : { $addToSet : "$name"}, 
        Product : { $push : "$Product"} 
       }} 
     ) 
    }); 

結果：例如http://localhost:8080/api/search?s=Apple /葡萄/胡蘿蔔，結果全部相同。

[ 
    { 
    "_id": "5528cfd2e71144e020cb6494", 
    "Category": ["Fruits"], 
    "Product": [ 
       { 
       "_id": "5528cfd2e71144e020cb6495", 
       "name": "Grapes" 
       }, 
       { 
       "_id": "552963ed63d867b81e18d357", 
       "name": "Apple" 
       }, 
       { 
       "_id": "552e61920c530fb848c61510", 
       "name": "Carrots" 
       } 
      ] 
    } 
]  

問題：在「蘋果」的查詢，它返回的產品，而不是僅僅「葡萄」中的所有對象，我想也許把比賽的展開後會做的伎倆或$正則表達式的情況下

什麼我想：例如對於「葡萄」searchString 另外我希望它開始發送結果，只要我發送我的查詢的前兩個字母。

[{ 
    "_id": ["5528cfd2e71144e020cb6494"], //I want this in array as it messes my loop up 
    "Category": "Fruits", //Yes I do not want this in array like I'm getting in my resutls 
    "Product": [{ 
       "_id": "5528cfd2e71144e020cb6495", 
       "name": "Grapes" 
       }] 
}] 

感謝您的耐心。

Answer 1

使用下聚合管線：

var search = "apple", 
    pipeline = [ 
     { 
      "$match": { 
       "Product.name": { "$regex": search, "$options": "i" } 
      } 
     }, 
     { 
      "$unwind": "$Product" 
     }, 
     { 
      "$match": { 
       "Product.name": { "$regex": search, "$options": "i" } 
      } 
     }, 
     { 
      "$project": { 
       "Category": "$name", 
       "Product._id": 1, 
       "Product.name": 1 
      } 
     } 
    ]; 

    db.collection.aggregate(pipeline); 

利用上述示例文檔和一個正則表達式（不區分大小寫）搜索「蘋果」的產品陣列的name字段，上述聚合管線產生結果：

輸出：

/* 1 */ 
{ 
    "result" : [ 
     { 
      "_id" : "5528cfd2e71144e020cb6494", 
      "Product" : { 
       "_id" : "552963ed63d867b81e18d357", 
       "name" : "Apple" 
      }, 
      "Category" : "Fruits" 
     } 
    ], 
    "ok" : 1 
}