Question

我有一个表单，用户可以通过指定买家名称或项目名称来选择搜索交易。所以我可以有任何这些查询：

本地主机：8000 / allPayments / I =面食
  本地主机：8000 / allPayments / B =优素福
  ？本地主机：8000 / allPayments / B =优素福＆安培; I =面食

在下面的代码中，mongoose将始终查找它们

 router.get('/allPayments', function (req, res, next) {
 Transaction.find({'buyerName':req.query.b , 'itemName':req.query.i})
                            .then(function (docsPay) {
                                res.render('allPayments', {
                                    payments: docsPay 
                  });
 });

如何在不编写上述代码3次的情况下告诉mongoose只查找查询中传递的内容？例如：如果查询是第二个，则只查找（{＆＃39; buyerName＆＃39;：req.query.b}）

Answer 1

您可以先根据条件创建查询对象。然后使用该查询对象。喜欢：

var query = {};
var isParamPresent = false;

if( req.query.b != undefined && req.query.i != undefined ){
 query['buyerName'] = req.query.b;
 query['itemName'] = req.query.i;
 isParamPresent = true;

} 
else if ( req.query.b != undefined && req.query.i == undefined ){
 query['buyerName'] = req.query.b;
 isParamPresent = true;    
}
else if (req.query.b == undefined && req.query.i != undefined){
 query['itemName'] = req.query.i;
 isParamPresent = true;
}
else{
 isParamPresent = false;
 // both are undefined, your logic
}

if( isParamPresent ){

Transaction.find(query).then(function (docsPay) {
                                res.render('allPayments', {
                                    payments: docsPay });
//Further logic
}

如何根据我的查询参数搜索mongoose？

1 个答案: