猫鼬用$ in查找数组
问题描述:
Team.find({
'_id': { $in: [
teamIds
] }
}, function(err, teamData) {
console.log("teams name " + teamData);
});
此代码为我们提供了未定义的答案..但是在var teamIds中是这样的:
This code gives us undefined back.. But in the var teamIds is this:
545646d5f5c1cce828982eb7,
545646d5f5c1cce828982eb8,
54564af5c9ddf61e2b56ad1e,
54564c1f1de201782bcdb623,
54564d2fc660a7e12be6c7a2,
54564df985495f142c638f9f,
54564eadb511f1792c9be138,
54564ec40cf6708a2cd01c81,
54564ee495f4aea22cf23728
有人看到错误了吗?
答
如果teamIds
已经是一个数组,则不应将其包装在另一个数组中:
If teamIds
is already an array, then you shouldn't wrap it in another array:
Team.find({
'_id': { $in: teamIds }
}, function(err, teamData) {
console.log("teams name " + teamData);
});
或者,如果teamIds
是一串用逗号分隔的id值,则需要使用split
将其转换为值数组:
Or, if teamIds
is a string of comma-separated id values, you need to convert it into an array of values using split
:
Team.find({
'_id': { $in: teamIds.split(',') }
}, function(err, teamData) {
console.log("teams name " + teamData);
});