CouchDB Weekly News, May 30

Major Discussions

Vote on release of Apache CouchDB 1.6.0 rc.5 (will be released as Apache CouchDB 1.6.0 — see thread)

The vote passed.

Limiting view access (see thread)

Use case: sharing docs between users with different roles and according access. Goal is to make sure via adding according CouchDB settings that no user can see who the other users of the doc are.

Answer: Natively, CouchDB doesn’t provide this functionality. Thus, the canonical answer is to use a proxy in front of CouchDB that can limit access to certain URLs, or to deploy a middleware layer written in your favourite language that can broker the access.

CouchDB minimum revs_limit and Compaction (see thread)

Use case: limiting the number of revisions stored for a specific document in a database. Setup: setting the revs_limit to a specific number and then running the compaction. This did not work, the number of revisions could not be limited this way, and the enquirer asked why.

Answer: _revs_limit does not do what one may think it does, – CouchDB is not a revision control system. After completion only the latest revision of each document is preserved. _revs_limit refers only to how many old _rev values are retained. Lowering this value will save some storage but can also make replication less efficient as a failure to find a common ancestor will cause CouchDB to copy the document afresh.

Releases in the CouchDB Universe

Follow 0.11.2 – can now listen to _db_updates
docuri 2.1 – rich document IDs for CouchDB, now including custom definitions and polished README
couch-daemon 1.3.0 – now listens to database updates
Couchmagick 2.1.2 – now supporting Docuris
rust-couchdb – a new CouchDB client, now for Rust
couchdb-worker 3.2.1 – CouchDB worker module that manages state
express-pouchdb 0.2.0 – express submodule with a CouchDB style REST interface to PouchDB
lockit-couchdb-adapter 0.4.3 – CouchDB adapter for lockit
cores 0.8.3 – CouchDB resources with validation

Special topic: Content Management Systems based on CouchDB

Kleks – a pure CouchDB based CMS written as a CouchApp using Kanso,
Spine.js, CoffeeScript and Stylus. Supports multi-site setup and
Markdown authoring
Couchpress – a super lightweight and modular CMS built on NodeJS, Express and CouchDB
CMS – a Content Management System written with Ruby on Rails and CouchDB
Cmtool – a rails 3.2+ CMS as engine for a CouchDB backend
CCMS – a Backend-free, client-side JavaScript and CouchDB based CMS
Falkland CMS (Website) – a Curation Management System written in Clojure, ClojureScript and CouchDB

Opinions

Geocouch on Fedora – a tutorial
Open Data made simple – CouchDB read only + ElasticSearch river
PouchDB: CouchDB Within The Browser – an introduction

Use Cases, Questions and Answers

Stack Overflow: CouchDB View equivalent of SUM & GROUP BY is there any example
Stack Overflow: Want to make my background image from attachments in CouchDB
Stack Overflow: How can we run parameterized query in CouchDB
Stack Overflow: Connecting Couchbase sync adapter to CouchDB server
Stack Overflow: How do I Return User Specific Data from CouchDB
Stack Overflow: How to get the field value which contain sub field and value in CouchDB
Stack Overflow: How can we get the field from a document in CouchDB
Stack Overflow: Add a field to existing document in CouchDB
Stack Overflow: implementation of json object and json array in CouchDB using Java
Stack Overflow: Updating subset of documents in a database - where/when to check and ignore changes?
Stack Overflow: Retrieve the data from database on the based condition in CouchDB
Stack Overflow: CouchDB error when typing Couchapp push Errno 111
Stack Overflow: CouchDB API for php
Stack Overflow: Getting single property from multiple views in CouchDB using ektorp
Stack Overflow: How to give subfield to a field of a document in CouchDB using java program?
Stack Overflow: How to select data from CouchDB on condition based
Stack Overflow: Get list of all view names in CouchDB
Stack Overflow: Split values of CouchDB result
Stack Overflow: CouchDB Futon Web Gui not working properly
Stack Overflow: How can I filter data during replication and give user only his own documents?
Stack Overflow: How to retrieve all data from a particular document in CouchDB?

Get involved!

If you want to get into working on CouchDB:

We have an infinite number of open contributor positions on CouchDB. Submit a pull request and join the project!
Here's a list of beginner tickets around our currently ongoing Fauxton-implementation. If you have any questions or need help, don't hesitate to contact us in the couchdb-dev IRC room (#couchdb-dev) – Garren (garren) and Sue (deathbear) are happy to help.

We'd be happy to have you!

Posted on behalf of Lena Reinhard.