Class: HashDiff

Inherits:
Object
  • Object
show all
Defined in:
lib/patch_utils/hash_diff.rb

Overview

Get diff from two hashes. (or from other data structure) return format: {:from => , :to => }

HashDiff.get_diff 1, 1 # => nil HashDiff.get_diff 1, 2 # => :to=>2 HashDiff.get_diff(=> 1, :b => 2, :c => ‘4’, => 4, :b => true, :c => 5) do |x, y| x.is_a?(Fixnum) || y.is_a?(TrueClass) end # => :from=>{:c=>“4”, :to=>:c=>5} HashDiff.get_diff [1,2,3], # => href="2,3">from=>, :to=> a = :same_num=>0, :an_other_num=>3, :create=>{:user=>[“new”, “save”], :an_array=>[1, 2, 3], :complex_json=>:f=>“x”}}} b = :same_num=>0, :update=>{:user=>[“edit”, “update”], :an_array=>[1, 2, 4], :an_other_array=>, :complex_json=>:f=>“g”, :h=>“i”}}} HashDiff.get_diff a, b # => :an_other_num=>3, :create=>{:user=>[“new”, “save”], :an_array=>, :complex_json=>:a=>{:b=>{:f=>“x”}}}, :to=>:update=>{:user=>[“edit”, “update”], :an_array=>, :an_other_array=>, :complex_json=>:a=>{:b=>{:f=>“g”, :h=>“i”}}}}

Class Method Summary collapse

Class Method Details

.get_diff(h1, h2, &blk) ⇒ Object 



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# File 'lib/patch_utils/hash_diff.rb', line 16

def self.get_diff h1, h2, &blk
  if block_given?
    return nil if yield(h1, h2)
  else
    return nil if h1 == h2
  end

  if h1.is_a?(Array) && h2.is_a?(Array)
    return {:from => (h1 - h2), :to => (h2 - h1)}
  end

  if h1.is_a?(Hash) && h2.is_a?(Hash)
    same_keys = (h1.keys & h2.keys)
    from = h1.clone
    to = h2.clone
    same_keys.each do |k|
      if block_given?
        if yield(h1[k], h2[k])
          from.delete(k)
          to.delete(k)
        end
      else
        if h1[k] == h2[k]
          from.delete(k)
          to.delete(k)
        end
      end
      _diff = self.get_diff(h1[k], h2[k], &blk)
      if _diff.present?
        from[k] = _diff[:from]
        to[k] = _diff[:to]
      end
    end
    return {:from => from, :to => to}
  end
  {:from => h1, :to => h2}
end