find_unique.coffee
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			@__findUnique = (Collection, field, oldId) ->
			if Collection.find("#{field}": oldId).count() is 0
			return oldId
			matches = /(.)_(\d)$/.exec oldId
			if !matches?
			name = oldId
			counter = 1
			else
			name = matches[1]
			counter = parseInt(matches[2])
			while Collection.find("#{field}": "#{name}_#{counter}").count() > 0
			counter += 1
			return "#{name}_#{counter}"

epiph/app/lib/collection_helpers/find_unique.coffee41ccfbdf84d4develop