MongoDb：如何将其他对象插入到对象集合中？ [英] MongoDb : How to insert additional object into object collection?
问题描述
我有一份文件所有者，可以有n个营地，营地有教师，教师有班级。之前我尝试使用嵌套数组来完成此操作（请参阅下面链接到我的帖子），但是我了解到位置运算符$没有嵌套那么深。
MongoDB：将数组添加到现有数组中
I have a document "owner" that can have "n" number of camps and camps have "instructors" and instructors have "classes". Earlier I tried accomplishing this with nested arrays (see link to my post below), however I learned that the positional operator "$" does not nest that deep. MongoDB: Adding an array into an existing array
但是，我了解到解决方法是使用对象集合而不是数组。我假设我必须使用更新和$ set来添加额外的阵营，但是每次我做的都是覆盖（更新）之前插入的阵营。
However, I learned that the workaround would be to use object collections instead of arrays. I'm assuming that I have to use "update" with "$set" to add additional "camps", however every time I do all it does is overwrite(update) the previous camp that was inserted.
以下是我想要完成的层次结构：
Below is the hierarchical structure I am trying to accomplish:
owner = {
firstName: 'john',
lastName: 'smith',
ownerEmail: 'john.smith@gmail.com',
camps : {
{
name: 'cubs-killeen',
location: 'killeen'
},
{
name: 'cubs-temple',
location: 'temple'
},
instructors : {
{
firstName: 'joe',
lastName : 'black'
},
{
firstName: 'will',
lastName : 'smith'
}
}
}
}
我也有我一直在尝试以下方法：
I have also been trying the following:
db.owners.update({ownerEmail:'john.smith@gmail.com'}, {$set: { camps:{ {name:'cubs-killeen'} } }})
但是这会抛出一个意外的标识符{错误。
but this throws an unexpected identifier { error.
任何有关实现上述结构的示例mongo命令的帮助都将非常受欢迎。
Any help with some sample mongo commands to achieve the structure above would be most appreciated.
V / R
Chris
推荐答案
As其他提到的，你想要的结构是无效的。
我建议您的所有者文档使用以下结构：
As other mentioned, The structure you want is not valid. I recommend the following structure for your owner document:
{
"_id" : ObjectId("51c9cf2b206dfb73d666ae07"),
"firstName" : "john",
"lastName" : "smith",
"ownerEmail" : "john.smith@gmail.com",
"camps" : [
{
"name" : "cubs-killeen",
"location" : "killeen"
},
{
"name" : "cubs-temple",
"location" : "temple"
}
],
"instructors" : [
{
"firstName" : "joe",
"lastName" : "black"
},
{
"firstName" : "will",
"lastName" : "smith"
}
]
}
然后
db.stack.update(
{ ownerEmail: "john.smith@gmail.com" },
{
$push: {
camps: { name: "cubs-killeen", location: "some other Place" }
}
}
);
有了这个，你可以添加这样的阵营：
Having this, you can add camps like this:
希望有所帮助。
这篇关于MongoDb：如何将其他对象插入到对象集合中？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
