动态构建聚合查询的json结构

Question

我想构建一个匹配其中包含数据的字段的查询。

我尝试这样做：

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... 

我尝试这样做：

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... 

他们没有工作。

确实没有聪明的方法来做到这一点？

Answer 1

你不应该使用内$match数组，正确的方法是使用一个对象，并给它分配：

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

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