node.js 猫鼬用 $in 查找数组
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Mongoose find array with $in
提问by Bart
Team.find({
'_id': { $in: [
teamIds
] }
}, function(err, teamData) {
console.log("teams name " + teamData);
});
This code gives us undefined back.. But in the var teamIds is this:
这段代码给了我们未定义的回.. 但在 var teamIds 中是这样的：
545646d5f5c1cce828982eb7,
545646d5f5c1cce828982eb8,
54564af5c9ddf61e2b56ad1e,
54564c1f1de201782bcdb623,
54564d2fc660a7e12be6c7a2,
54564df985495f142c638f9f,
54564eadb511f1792c9be138,
54564ec40cf6708a2cd01c81,
54564ee495f4aea22cf23728
Does anybody see the error?
有人看到错误吗？
回答by JohnnyHK
If teamIdsis already an array, then you shouldn't wrap it in another array:
如果teamIds已经是一个数组，则不应将其包装在另一个数组中：
Team.find({
'_id': { $in: teamIds }
}, function(err, teamData) {
console.log("teams name " + teamData);
});
Or, if teamIdsis a string of comma-separated id values, you need to convert it into an array of values using split:
或者，如果teamIds是一串以逗号分隔的 id 值，则需要使用以下方法将其转换为值数组split：
Team.find({
'_id': { $in: teamIds.split(',') }
}, function(err, teamData) {
console.log("teams name " + teamData);
});
