如何使用CouchDB / Node.js中的Cradle删除键值对？

Question

I've been working a lot with Cradle, the couchDB client. However, I have a document filled with key-value pairs, and I'm trying to delete a specific row in there.

In the documentation, I cannot find a way to do deletion that doesn't include deleting the entire document or updating it with a null value. Can anyone point me in the right direction? I feel this is most likely a very simple issue that lots of people run into.

Answer 1

在CouchDB中，不支持部分文档更新（偶尔会讨论对此的支持，但由于没有可接受的方法来修补JSON，因此它永远不会很远），因此您必须更新整个文档删除不需要的键/值对的副本。

Answer 2

Okay all, I found a solution that's a work around to this.

Instead of making a document that has a list of key-value pairs, instead just make a document with one field and for it's value insert the JSON of the key value pairs. That way, you can pull the value, delete a field and save it back to the original value, without needing to recreate the entire document over again.

Here's an example using Cradle:

db.get('document', function (err, doc) {
  var inside_key_values = doc.key_value_pair;

  delete inside_key_values[key_to_delete];

  db.merge("document", {
        key_value_pair: inside_key_values
      }, function (err, res) {
        console.log('New key value pairs saved')
    });

});

This is all based @djc 's great response on the lack of support on the couchDB end. Hopefully someone else out there finds this workaround valuable.