Module: JSON

Defined in:
lib/leap_cli/core_ext/json.rb

Class Method Summary collapse

Class Method Details

.sorted_generate(obj) ⇒ Object

Output JSON from ruby objects in such a manner that all the hashes and arrays are output in alphanumeric sorted order. This is required so that our generated configs don’t throw puppet or git for a tizzy fit.

Beware: some hacky stuff ahead.

This relies on the pure ruby implementation of JSON.generate (i.e. require ‘json/pure’) see github.com/flori/json/blob/master/lib/json/pure/generator.rb

The Oj way that we are not using: Oj.dump(obj, :mode => :compat, :indent => 2)



13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
 
# File 'lib/leap_cli/core_ext/json.rb', line 13

def self.sorted_generate(obj)
  # modify hash and array
  Array.class_eval do
    alias_method :each_without_sort, :each
    def each(&block)
      sorted = sort {|a,b| a.to_s <=> b.to_s }
      for i in 0..(sorted.length-1) do
        yield sorted[i]
      end
    end
  end
  Hash.class_eval do
    alias_method :each_without_sort, :each
    def each(&block)
      self.keys.each do |key|
        yield key, self.fetch(key) # fetch is used so we don't trigger Config::Object auto-eval
      end
    end
  end

  # generate json
  json_str = JSON.pretty_generate(obj)

  # restore hash and array
  Hash.class_eval  {alias_method :each, :each_without_sort}
  Array.class_eval {alias_method :each, :each_without_sort}

  return json_str
end