In CouchDB, there is no support for partial document updates (support for this is discussed every once in a while, but since there is no accepted way to patch JSON, it never gets very far), so you have to update the entire document with a copy where the unwanted key/value pair is removed.
How do I delete a key-value pair using Cradle in CouchDB/Node.js?
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23-03-2022 - |
Вопрос
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.
Решение
Другие советы
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.