Mongo一对多关系和更新问题
我正在基于 MongoDB 实现博客。
首先让我们看看 Mongo 人如何建议我们存储博客文章及其评论（http:// /www.mongodb.org/display/DOCS/Schema+Design)：
- 帖子应该是一个集合。为了提高性能，评论应该嵌入帖子中的对象。
我发现在这个模式中编辑或批准评论非常困难。
由于评论是帖子文档的一部分，我无法单独编辑它，因为它没有标识符可以在评论集合中找到它。
这就是为什么我要立即编辑所有评论。另一个问题是，当我立即编辑所有评论时，有人可以发布新评论，并且在保存评论集合后它将被覆盖。
也许我做错了什么？或者 Mongo 人员描述的用例希望评论不会被编辑。
问候， 阿列克谢·扎哈罗夫。
I'm implementing blog based on MongoDB.
Let's look at first how Mongo guys recommend us to store blog post and its comments (http://www.mongodb.org/display/DOCS/Schema+Design):
- posts should be a collection. comments should be embedded objects within a post for performance.
I found that it is very difficult to edit or just approve comments in this schema.
Due to comment is a part of Post document i cannot edit it separately because it has no identifier to find it in comments collection.
That is why I'm editing all comments at once. Another problem is that while i'm editing all comments at once someone could post a new comment and it will overrided after saving of comments collection.
May be I'm doing something wrong? Or the use case described by Mongo guys expect that comments won't be edited.
Regards,
Alexey Zakharov.
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您应该能够使用 原子运算符 来绕过“保存所有评论” ' 问题。例如，类似这样的内容应该有效：
编辑：只是为了扩展我上面的答案。原子运算符的工作方式是仅更新您告诉它们的特定字段，而不是整个文档。这不仅使您的更新更加简洁，而且速度也相当快。特别是，在您的示例中，您有一篇包含许多评论的大型博客文章。
You should be able to use Atomic Operators to get around the 'saving all comments' issue. For example, something like this should work:
Edit: Just to expand on my above answer. The way atomic operators work is by only updating the specific field(s) you tell them to, rather than the whole document. This not only makes your update more concise but also considerably faster. Especially if, in your example, you have a large blog post with many comments.