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The "EnableErlangViews" page has been changed by caolan: http://wiki.apache.org/couchdb/EnableErlangViews New page: Since version 0.10.0, CouchDB has a native Erlang view server, allowing you to write your map/reduce functions in Erlang. There is no-longer the need to manually install [[http://github.com/mmcdanie/erlview|erlview]], unless you are running an old version of CouchDB. First, you'll need to edit your `local.ini` to include a native_query_servers section: {{{ [native_query_servers] erlang = {couch_native_process, start_link, []} }}} Your local.ini will most likely be at `/usr/local/etc/couchdb/local.ini` or `/etc/couchdb/local.ini`. To see these changes you will also need to restart the server: {{{ sudo /etc/init.d/couchdb restart }}} To test out using Erlang views, visit the Futon admin interface, create a new database and open a temporary view. You should now be able to select erlang from the language drop-down. Let's try an example of map/reduce functions which count the total documents at each number of revisions (there are x many documents at version "1", and y documents at "2"... etc). Add a few documents to the database, then enter the following functions as a temporary view: {{{ %% Map Function fun({Doc}) -> <<K,_/binary>> = proplists:get_value(<<"_rev">>, Doc, null), V = proplists:get_value(<<"_id">>, Doc, null), Emit(<<K>>, V) end. %% Reduce Function fun(Keys, Values, ReReduce) -> length(Values) end. }}} If all has gone well, after running the view you should see a list of the total number of documents at each revision number.
