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copied!<p>You got some great answers here already.</p> <p>From the nano source code you have an example that might help:</p> <ul> <li><a href="https://github.com/dscape/nano/blob/master/examples/bulk_transform.js" rel="nofollow">https://github.com/dscape/nano/blob/master/examples/bulk_transform.js</a></li> </ul> <p>Also if you don't really understand how nodejs flow control works I can't recommend enough that you see this tutorial:</p> <ul> <li><a href="http://nodetuts.com/tutorials/19-asynchronous-iteration-patterns.html#video" rel="nofollow">http://nodetuts.com/tutorials/19-asynchronous-iteration-patterns.html#video</a></li> </ul> <p>Better than using a tool is to use the tool understanding how it works :) Maybe you'll end up just coding your own control flow, that's what most of us ends up doing anyway.</p> <p>Hope this helps, attached code for convenience.</p> <pre><code> var db = require('nano')('http://localhost:5984/emails') , async = require('async') ; function update_row(row,cb) { var doc = row.doc; delete doc.subject; db.insert(doc, doc._id, function (err, data) { if(err) { console.log('err at ' + doc._id); cb(err); } else { console.log('updated ' + doc._id); cb(); } }); } function list(offset) { var ended = false; offset = offset || 0; db.list({include_docs: true, limit: 10, skip: offset}, function(err, data) { var total, offset, rows; if(err) { console.log('fuuuu: ' + err.message); rows = []; return; } total = data.total_rows; offset = data.offset; rows = data.rows; if(offset === total) { ended = true; return; } async.forEach(rows, update_row, function (err) { if(err) { console.log('something failed, check logs'); } if(ended) { return; } list(offset+10); }); }); } list(); </code></pre>

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