Class: D2E

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

Constant Summary collapse

VERSION = 
"0.0.4"

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ D2E

Returns a new instance of D2E.



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

def initialize(options)
  @id = [options[:id]].flatten
  if options[:ignore]
    @ignore = [options[:ignore]].flatten
  end
end

Instance Method Details

#d2e(prev, curr) ⇒ Object 



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# File 'lib/d2e.rb', line 11

def d2e(prev, curr)
  events = []

  deleted = difference(prev, curr)
  created = difference(curr, prev)
  remained = intersection(prev, curr)

  created.each do |item|
    events << {'type' => 'create', 'item' => item}
  end

  deleted.each do |item|
    events << {'type' => 'delete', 'item' => item}
  end

  remained.each do |prev_item, curr_item|
    diff = {}
    keys = prev_item.keys | curr_item.keys
    if @ignore
      keys = keys - @ignore
    end
    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?
      id = Hash[@id.map {|id| [id, prev_item[id]] }]
      events << {'type' => 'update', 'id' => id, 'diff' => diff, 'prev' => prev_item, 'curr' => curr_item}
    end
  end

  events
end

#difference(list_a, list_b) ⇒ Object 



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# File 'lib/d2e.rb', line 48

def difference(list_a, list_b)
  list = []
  list_a.each do |item_a|
    if !list_b.find {|item_b| @id.all? {|id| item_a[id] == item_b[id] } }
      list << item_a
    end
  end
  list
end

#intersection(list_a, list_b) ⇒ Object 



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# File 'lib/d2e.rb', line 58

def intersection(list_a, list_b)
  list = []
  list_a.each do |item_a|
    if item_b = list_b.find {|item_b| @id.all? {|id| item_a[id] == item_b[id] } }
      list << [item_a, item_b]
    end
  end
  list
end