https://github.com/mercmobily/simpledblayer-mongo

MongoDb layer for simpledblayer
https://github.com/mercmobily/simpledblayer-mongo

Last synced: 2 days ago
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MongoDb layer for simpledblayer

• Host: GitHub
• URL: https://github.com/mercmobily/simpledblayer-mongo
• Owner: mercmobily
• License: gpl-3.0
• Created: 2013-11-12T05:54:39.000Z (about 11 years ago)
• Default Branch: master
• Last Pushed: 2017-12-20T15:39:29.000Z (about 7 years ago)
• Last Synced: 2025-01-03T23:17:05.916Z (29 days ago)
• Language: JavaScript
• Size: 202 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
simpledblayer-mongo

===================

SimpleDbLayer is the MongoDB layer for [simpledblayer](https://github.com/mercmobily/simpledblayer)

It provides an incredibly fast mplementation of joins, by caching results in the records themselves. So, to fetch a person's record, along with her email addresses, addresses, and phone number, it's actually just _one_ read DB operation (!) thanks to the aggressive caching happening (all children data is kept with the record).

The MongoDB layer deals with:

* Update related collections when a collection is changed. This means that each record's cache is always up to date: if you update an email address, the affected contacts' cache is also updated (deletions, updates, inserts)

* Re-work records marked as "dirty". If you change the schema for a collection, you will need to mark as "dirty" all of the records in related tables, since they will contain outdated information)

If a record is "dirty", the cache will be re-generated on the fly whenever a record is fetched.

## Limitations

Unfortunately, doing a mass-update on a table with children in a 1:n relationship is not allowed because of [MongoDB bug #1243](https://jira.mongodb.org/browse/server-1243), which prevents multuple update in cache from working (the `$` positional operator won't work for sub-arrays).