如何print/use保存()数据结果mongoshell

Question

我正在从 mongo shell 的集合中添加一条记录，并且添加成功，

var demoData = db.getCollection('demoCollection').save({
    "name": "My Name",
    "about": "About my self",
    "createdAt": new Date(Date.now()).toISOString()
});

我想在另一个操作中使用上面添加的记录_id，但我无法打印 demoData 或 demoData._id、

的结果

我尝试了以下选项，

print(demoData._id); // returns '[unknown type]'
printJson(demoData); // Not printing
printJson(demoData.toArray()); // Not printing

Answer 1

savereturns一个WriteResult。尝试：

MongoDB Enterprise ruby-driver-rs:PRIMARY> x={a:1}
{ "a" : 1 }

MongoDB Enterprise ruby-driver-rs:PRIMARY> db.foo.save(x)
WriteResult({ "nInserted" : 1 })

MongoDB Enterprise ruby-driver-rs:PRIMARY> x
{ "a" : 1, "_id" : ObjectId("5f04601ac17c40d26f231e47") }

如何print/use保存()数据结果mongoshell

How to print/use save() data result mongo shell

mongodb

mongo-shell