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A Ruby version of the CouchDB query server - for specifying your map, reduce, etc functions in ruby
tag: v0.2.0

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CouchDB Ruby Query Server

by Matthew Lyon

This is a ruby version of the CouchDB Query server. It will let you write your map and reduce functions in ruby (instead of javascript, erlang, or what have you) and eventually all your couchapp functions as well.

It is still very much a work in progress, please don't use it for anything in production yet.


In one of your CouchDB config files, add this:

ruby = /path/to/ruby /path/to/bin/couchdb_view_server

If you want to just use environment ruby you can leave /path/to/ruby out.

Your design documents should look something like this:

    "_id": "_design/foos",
    "language": "ruby",
    "views": {
        "foos": {
            "map": <<-RUBY
                lambda{|doc| emit(doc['foo'], nil) }

If you are going to allow people you may not necessarily trust "admin-level" access to your CouchDB install, such that they may create design documents and therefore upload their own code, you may sandbox user code with the --safe flag like so:

ruby = /path/to/ruby -- /path/to/bin/couchdb_view_server --safe

All code is eval'd and run under a $SAFE level of 4 in this mode. If running in safe mode, it is preferred to run under Ruby 1.9, which has a vastly improved "trust/untrusted" model for security of objects.


Does not yet run on Ruby 1.8.6, as it requires instance_exec. Will most likely just steal Rails' implementation.


  • handle edge cases for map/reduce that aren't covered by the couchdb view server spec but indicated in the javascript view query server code.
  • Better Error Handling (for syntax errors, etc)
  • Document Management Functions (update, validation)
  • Streaming Update Functions (filter)
  • Templating Functions (show, list)



  • add support for validate_doc_update and updates functions.

0.1.2 2010-03-14

  • fix for multiple reduce functions being run simultaneously

0.1.1 2010-03-14

  • README updates, gem version bump

0.1 2010-03-14

  • Offer a "safe" flag to provide a locked-down sandbox for user code inside $SAFE level 4.

0.1pre 2 2010-03-13

  • Consolidate a lot of the "in-place, get it working" code for map/reduce to the View module.

0.1pre 1 2010-03-07

  • Basic implementation of map/reduce working.
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