深度克隆带有嵌入文档 ID（树结构）的 MongoDb 文档

Question

I am struggling on finding a solution based on deep cloning a given document which has embedded documents ID's, but those embedded documents might also have other embedded documents ID's. I want to create copies of these embedded documents in the specific collections they belong to and build up the parent(root) document that has references to these newly added documents. So for example I have this schema:

1. page

{ 
"_id" : 123456789, 
"page_title" : "Title 1",
"sections" : [111, 222, ...]
"variables" : [v1, v2, ...]
}

2. sections

{ 
"_id" : 111, 
"section_tag" : "Section 1",
"sections" : [333, ...]
"blocks" : [1212, 2323, ...]
}

3. blocks

{ 
"_id" : 1212, 
"block_type" : "paragraph" (or image etc.),
"content" : "<p> content goes here...</p>"
"conditions" : [condition_id_1, condition_id_2, ...] (these are also embedded documents)
}

So first of all I have to clone the document named 'page' and then I would continue cloning the 'sections' property of this document. But for each 'section' document we also have other embedded documents and so on.

Is there any solution to this problem? I am concerned that in NoSQL databases it isn't a good idea having a tree model structure and collections being in relationships with others, would make it worse querying and also storing data. Also I know about embedding the whole document and not only the Id of the documents it refers to, but there is a limit for the document size in MongoDb which is 16mb and this is not something I strive for.

Thank you for reaching this far and I hope you have understood the problem description. I also apologize for my bad english.

----Edited So after the cloning of a document, that is in the page collection, the database should look like:

1. page collection

{ 
"_id" : 4567890, 
"page_title" : "Title 1",
"sections" : [444, 555, ...]
"variables" : [v3, v4, ...]
}

2. sections collection (note how this document can reference to other documents of the same collection)

{ 
"_id" : 444, 
"section_tag" : "Section 1",
"sections" : [666, ...]
"blocks" : [3434, 4545, ...]
}

3. blocks

{ 
"_id" : 3434, 
"block_type" : "paragraph" (or image etc.),
"content" : "<p> content goes here...</p>"
"conditions" : [condition_id_3, condition_id_4, ...] (these are also embedded documents ID's)
}

Answer 1

if you're talking about deep cloning a c# poco, you can use the following extension method for that:

public static class Extensions
{
    public static T Duplicate<T>(this T source)
    {
        return BsonSerializer.Deserialize<Container<T>>(
            new Container<T> { Data = source }.ToBson()
            ).Data;
    }

    private class Container<T>
    {
        public T Data { get; set; }
    }
}

and you can use it like so:

Page copy = page.Duplicate();

you will need the following imports:

using MongoDB.Bson;
using MongoDB.Bson.Serialization;