Ruby: CouchDB のデータを更新 (Update)

couch_update.rb

#! /usr/bin/ruby
# -*- encoding: utf-8 -*-
#
#   couch_update.rb
#
#                   Jul/31/2020
#
# ---------------------------------------------------------------------
require 'faraday'
require 'json'
require 'date'
#
# ---------------------------------------------------------------------
STDERR.puts "*** 開始 ***"
#
key_in = ARGV[0]
population_in = ARGV[1].to_i
puts key_in,population_in

URL="http://localhost:5984/nagano/" + key_in
#
res = Faraday.get URL

puts    res.status

if res.status == 200 then
    json_str = res.body

    data_aa=JSON.parse(json_str)
#
    puts data_aa
    puts data_aa["_rev"]
    puts data_aa["name"]
#
    args = {}
    args["name"] = data_aa["name"]
    args["population"] = population_in
    args["date_mod"] = Date.today

    url_up = URL + "?rev=" + data_aa["_rev"]

    con = Faraday.new 
    res = con.put do |req|
        req.url url_up
        req.headers['Content-Type'] = 'application/json'
        req.body = JSON.pretty_generate(args)
    end

    puts res.status
end

STDERR.puts "*** 終了 ***"
# ---------------------------------------------------------------------

実行

./couch_update.rb t2029 4213500