/
summarizer.rb
52 lines (45 loc) · 1.21 KB
/
summarizer.rb
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#!/usr/bin/env ruby
require 'rubygems'
require 'mongo'
require 'csv'
conn = Mongo::Connection.new
db = conn.db("wargraves")
collection = db.collection("casualties")
def summary(collection,field)
summary = collection.group(:key=> [field],
:initial => {:count=>0},
:reduce=>"function(o,p) {p.count++; }")
hist = Hash.new(0)
summary.each {|h|
group = h[field.to_s]
if block_given?
group = yield group
end
value = h["count"]
hist[group] += value.to_i
}
hist
end
def as_csv(file,collection,&block)
keys = collection.keys.compact.sort
if block
keys = keys.sort_by &block
end
keys.each do |k|
file.puts CSV.generate_line([k,collection[k]])
end
end
File.open("nationalities.csv","w") do |f|
as_csv(f,summary(collection,:nationality))
end
File.open("deaths.csv","w") do |f|
as_csv(f, summary(collection,:death)) do |date|
day,month,year = date.split("/"); [year,month,day].join("")
end
end
File.open("ages.csv","w") do |f|
as_csv(f,summary(collection,:age) {|a| a.nil? ? nil : a.to_i})
end
File.open("ranks.csv","w") do |f|
as_csv(f,summary(collection,:rank) {|g| g.gsub(/\(.*\)/,"").strip })
end