動態構建聚合查詢的json結構

Question

我想構建一個匹配其中包含數據的字段的查詢。

我嘗試這樣做：

var matchStr = {}; 
if (received.user) { 
    matchStr = { "_id": { "$regex": received.user, "$options": "i" } }; 
} 
if (received.name) { 
    matchStr += { "name": { "$regex": received.name, "$options": "i" } }; 
} 
if (received.phone) { 
    matchStr += { "phone": { "$regex": received.phone, "$options": "i" } }; 
} 

usersTable.aggregate([ 
{ 
    $match: { matchStr } 
}, etc... 

我嘗試這樣做：

var matchStr = []; 
if (received.user) { 
    matchStr.push({ "_id": { "$regex": received.user, "$options": "i" } }); 
} 
if (received.name) { 
    matchStr.push({ "name": { "$regex": received.name, "$options": "i" } }); 
} 
if (received.phone) { 
    matchStr.push({ "phone": { "$regex": received.phone, "$options": "i" } }); 
}  

usersTable.aggregate([ 
{ 
    $match: { matchStr } 
}, etc... 

他們沒有工作。

確實沒有聰明的方法來做到這一點？

Answer 1

你不應該使用內$match數組，正確的方法是使用一個對象，並給它分配：

var matchStr = {}; 
if (received.user) { 
    matchStr["_id"] = { "$regex": received.user, "$options": "i" }; 
} 
//etc... 

usersTable.aggregate([ 
{ 
    $match: matchStr 
}, 
//etc...