Class: D2E

Inherits:
Object
  • Object
show all
Defined in:
lib/d2e.rb,
lib/d2e/version.rb

Constant Summary collapse

VERSION = 
"0.0.2"

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ D2E

Returns a new instance of D2E.



4
5
6
 
# File 'lib/d2e.rb', line 4

def initialize(options)
  @key = options[:key]
end

Instance Method Details

#diff(prev, curr) ⇒ Object 



8
9
10
11
12
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
42
43
44
45
46
 
# File 'lib/d2e.rb', line 8

def diff(prev, curr)
  events = []

  prev_ids = prev.map {|item| item[@key] }
  curr_ids = curr.map {|item| item[@key] }

  deleted = prev_ids - curr_ids
  created = curr_ids - prev_ids
  updated = prev_ids & curr_ids

  created.each do |id|
    item = curr.find {|item| item[@key] == id }
    events << {'type' => 'create', 'item' => item}
  end

  deleted.each do |id|
    item = prev.find {|item| item[@key] == id }
    events << {'type' => 'delete', 'item' => item}
  end

  updated.each do |id|
    diff = {}
    prev_item = prev.find {|item| item[@key] == id }
    curr_item = curr.find {|item| item[@key] == id }
    keys = prev_item.keys | curr_item.keys
    keys.each do |key|
      prev_value = prev_item[key]
      curr_value = curr_item[key]
      if prev_value != curr_value
        diff[key] = [prev_value, curr_value]
      end
    end
    if !diff.empty?
      events << {'type' => 'update', 'id' => id, 'diff' => diff}
    end
  end

  events
end