我正在使用MongoDB的外键策略来映射订阅表中的sub_id ...而映射我已经给出了调试目的的控制台日志，因为我从3天后没有得到适当的结果...我希望它迭代每个结果光标由first find（）生成。
这里是NodeJS服务器API
connection((db) => {
db.collection('gyms').find().toArray(function(err, main_results) {
if (err) throw err;
main_results.forEach(main_result => {
subscriptions = main_result.subscriptions;
console.log(subscriptions);
console.log(subscriptions.length);
if (subscriptions.length == 1) {
latest_sub = subscriptions[0];
} else {
latest_sub = subscriptions[subscriptions.length - 1];
}
console.log(latest_sub);
db.collection('subscriptions')
.findOne({
_id: ObjectId(latest_sub.sub_id)
}, function(err, sub_results) {
if (err) throw err;
console.log(main_result);
console.log(latest_sub)
console.log(sub_results);
main_result.latest_plan = sub_results.name;
var date = new Date(latest_sub.date);
console.log("kab kiya? " + date);
var newDate = new Date(date.setTime(date.getTime() + sub_results.validity * 86400000));
console.log("kab khatm hoga?" + newDate);
validity = Math.floor((newDate - new Date()) / (1000 * 3600 * 24));
console.log("validity" + validity);
console.log("--------------------------------------");
if (validity >= 0) {
main_result.validity = validity;
} else {
main_result.validity = -1;
}
});
});
function myRes() {
res.json({
success: true,
data: main_results
})
}
setTimeout(myRes, 3000);
});
});
控制台记录
[ { sub_id: '5a4b365f378e1c0b18862582',
date: 2017-12-19T18:30:00.000Z } ]
1
{ sub_id: '5a4b365f378e1c0b18862582',
date: 2017-12-19T18:30:00.000Z }
[ { sub_id: '5a4b3666378e1c0b18862583',
date: 2017-12-19T18:30:00.000Z } ]
1
{ sub_id: '5a4b3666378e1c0b18862583',
date: 2017-12-19T18:30:00.000Z }
[ { sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-19T18:30:00.000Z } ]
1
{ sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-19T18:30:00.000Z }
[ { sub_id: '5a4b3666378e1c0b18862583',
date: 2017-12-19T18:30:00.000Z } ]
1
{ sub_id: '5a4b3666378e1c0b18862583',
date: 2017-12-19T18:30:00.000Z }
[ { sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-28T18:30:00.000Z } ]
1
{ sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-28T18:30:00.000Z }
{ _id: 5a4b368c378e1c0b18862585,
join_date: '2017/12/20',
gender: 'Male',
owner: 'A',
name: 'A',
address: '14 shree om darshan, sai nagar',
state: '—',
city: 'Nashik',
pin_code: 422004,
phone: 9370555444,
email: 'alpesh.vasani857@gmail.com',
username: 'A',
subscriptions:
[ { sub_id: '5a4b365f378e1c0b18862582',
date: 2017-12-19T18:30:00.000Z } ] }
{ sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-28T18:30:00.000Z }
{ _id: 5a4b365f378e1c0b18862582,
name: 'for A',
validity: 111,
price: 111,
availability: true }
kab kiya? Fri Dec 29 2017 00:00:00 GMT+0530 (India Standard Time)
kab khatm hoga?Thu Apr 19 2018 00:00:00 GMT+0530 (India Standard Time)
validity106
--------------------------------------
{ _id: 5a4b3697378e1c0b18862586,
join_date: '2017/12/20',
gender: 'Male',
owner: 'B',
name: 'B',
address: '14 shree om darshan, sai nagar',
state: '—',
city: 'Nashik',
pin_code: 422004,
phone: 9370555444,
email: 'alpesh.vasani857@gmail.com',
username: 'B',
subscriptions:
[ { sub_id: '5a4b3666378e1c0b18862583',
date: 2017-12-19T18:30:00.000Z } ] }
{ sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-28T18:30:00.000Z }
{ _id: 5a4b3666378e1c0b18862583,
name: 'for B',
validity: 222,
price: 222,
availability: true }
kab kiya? Fri Dec 29 2017 00:00:00 GMT+0530 (India Standard Time)
kab khatm hoga?Wed Aug 08 2018 00:00:00 GMT+0530 (India Standard Time)
validity217
--------------------------------------
{ _id: 5a4b36a3378e1c0b18862587,
join_date: '2017/12/20',
gender: 'Male',
owner: 'C',
name: 'C',
address: '14 shree om darshan, sai nagar',
state: '—',
city: 'Nashik',
pin_code: 422004,
phone: 9370555444,
email: 'alpesh.vasani857@gmail.com',
username: 'C',
subscriptions:
[ { sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-19T18:30:00.000Z } ] }
{ sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-28T18:30:00.000Z }
{ _id: 5a4b366f378e1c0b18862584,
name: 'for C',
validity: 333,
price: 333,
availability: true }
kab kiya? Fri Dec 29 2017 00:00:00 GMT+0530 (India Standard Time)
kab khatm hoga?Tue Nov 27 2018 00:00:00 GMT+0530 (India Standard Time)
validity328
--------------------------------------
{ _id: 5a4b36c8378e1c0b18862588,
join_date: '2017/12/20',
gender: 'Male',
owner: 'C',
name: 'C',
address: '14 shree om darshan, sai nagar',
state: '—',
city: 'Nashik',
pin_code: 422004,
phone: 9370555444,
email: 'alpesh.vasani857@gmail.com',
username: 'C',
subscriptions:
[ { sub_id: '5a4b3666378e1c0b18862583',
date: 2017-12-19T18:30:00.000Z } ] }
{ sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-28T18:30:00.000Z }
{ _id: 5a4b3666378e1c0b18862583,
name: 'for B',
validity: 222,
price: 222,
availability: true }
kab kiya? Fri Dec 29 2017 00:00:00 GMT+0530 (India Standard Time)
kab khatm hoga?Wed Aug 08 2018 00:00:00 GMT+0530 (India Standard Time)
validity217
--------------------------------------
{ _id: 5a4b36dc378e1c0b18862589,
join_date: '2017/12/29',
gender: 'Male',
owner: 'C',
name: 'C',
address: '14 shree om darshan, sai nagar',
state: '—',
city: 'Nashik',
pin_code: 422004,
phone: 9370555444,
email: 'alpesh.vasani857@gmail.com',
username: 'C',
subscriptions:
[ { sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-28T18:30:00.000Z } ] }
{ sub_id: '5a4b366f378e1c0b18862584',
date: 2017-12-28T18:30:00.000Z }
{ _id: 5a4b366f378e1c0b18862584,
name: 'for C',
validity: 333,
price: 333,
availability: true }
kab kiya? Fri Dec 29 2017 00:00:00 GMT+0530 (India Standard Time)
kab khatm hoga?Tue Nov 27 2018 00:00:00 GMT+0530 (India Standard Time)
validity328
--------------------------------------