Good question, I was looking into this myself as well. Create a new version on each change I came across the Versioning module of the Mongoid driver for Ruby. I haven’t used it myself, but from what I could find, it adds a version number to each document. Older versions are embedded in the document … Read more
It really is an “it depends” kinda question. Some general points: NoSQL is typically good for unstructured/”schemaless” data – usually, you don’t need to explicitly define your schema up front and can just include new fields without any ceremony NoSQL typically favours a denormalised schema due to no support for JOINs per the RDBMS world. … Read more
There’s currently no way to filter on embedded docs in the way you’re describing. Using the dot notation allows you to match on an embedded doc, but the entire document, parent and all, will still be returned. It’s also possible to select which fields will be returned, but that doesn’t really help your case, either. … Read more
After running some queries, I came to the conclusion that $in doesn’t work for an array of arrays. You can use $elemMatch instead and it’ll work, but it is frustrating that MongoDB’s documentation doesn’t warn about it. I created this document: { “_id”: “51cb12857124a215940cf2d4”, “level1”: [ [ “item00”, “item01” ], [ “item10”, “item11” ] ], … Read more
Don’t use insert. Use update with upsert=true. Update will look for the document that matches your query, then it will modify the fields you want and then, you can tell it upsert:True if you want to insert if no document matches your query. db.collection.update( <query>, <update>, { upsert: <boolean>, multi: <boolean>, writeConcern: <document> } ) … Read more
I think there are some essential differences between CouchDB and Couchbase Server that need to be pointed out. I will not write about the advantages of switching from CouchDB to the Couchbase Server because those are described pretty much everywhere (see The Future of CouchDB by Damien Katz or Couchbase vs. Apache CouchDB by Couchbase). … Read more
I’ll post this as an answer purely to support the conversation – Tim Mahy , nawroth , and CraigTP have suggested viable databases. CouchDB would be my preferred due to the use of Erlang, but there are others out there. I’d say ACID does not contradict or negate the concept of NoSQL… While there seems … Read more
@Joni is correct, you need to use datetime. from datetime import datetime from pymongo import Connection # i have updated and included the complete code client = Connection(‘localhost’, 27017) db = client[‘database’] # your database name inoshare = db[‘inoshare’] # convert your date string to datetime object start = datetime(2014, 9, 24, 7, 51, 04) … Read more
Modern releases of pymongo ( greater than 3.x ) wrap bulk operations in a consistent interface that downgrades where the server release does not support bulk operations. This is now consistent in MongoDB officially supported drivers. So the preferred method for coding is to use bulk_write() instead, where you use an UpdateOne other other appropriate … Read more