created some utility scripts

utils/subset.rb

@@ -0,0 +1,30 @@
+require 'rubygems'
+require 'couchrest'
+
+# subset.rb replicates a percentage of a database to a fresh database.
+# use it to create a smaller dataset on which to prototype views.
+
+# specify the source database
+source = CouchRest.new("http://localhost:5984").database('source-db')
+
+# specify the target database
+target = CouchRest.new("http://localhost:5984").database('target-db')
+
+# pager efficiently yields all view rows
+pager = CouchRest::Pager.new(source)
+
+pager.all_docs(1000) do |rows|  
+  docs = rows.collect do |r|
+    # the percentage of docs to clone
+    next if rand > 0.1 
+    doc = source.get(r['id'])
+    doc.delete('_rev')
+    doc      
+  end.compact
+  puts docs.length
+  next if docs.empty?
+
+  puts docs.first['_id']
+  target.bulk_save(docs)
+end
+