Trees in CouchDB

问题

I'm new to CouchDB and have a question.

I'm saving messages with the ID of the parent message as an attribute. A message can also have a childMessage as parent, so it looks like a tree.

How can i query all childs including the childs of the childs?

Thank you

回答1:

This is the commonly used method when dealing with hierarchical data: http://probablyprogramming.com/2008/07/04/storing-hierarchical-data-in-couchdb/

回答2:

CouchDB works best with the de-normalized data. You should consider de-normalizing your data as much as possible. Maybe you may store the whole tree as a single document?

E.g.:

{
  "msg":"Parent message",
  "children":[
    {
       "msg":"sub message 1"
    },
    {
       "msg":"sub message 2",
       "children":[
         {
           "msg":"sub sub message 1"
         }
       ]
    }
  ]
}

来源：https://stackoverflow.com/questions/4512298/trees-in-couchdb