Class: HappyMapper::ChangeLister

Inherits:
Object
  • Object
show all
Defined in:
lib/happymapper/differ.rb

Overview

ChangeLister creates a hash of all changes between the two objects

Instance Method Summary collapse

Constructor Details

#initialize(current, compared) ⇒ ChangeLister

Returns a new instance of ChangeLister.



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# File 'lib/happymapper/differ.rb', line 111

def initialize(current, compared)
  @current = current
  @compared = compared
  @changes = {}
end

Instance Method Details

#elements_and_attributes ⇒ Object 



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# File 'lib/happymapper/differ.rb', line 162

def elements_and_attributes
  @current.class.attributes + @current.class.elements
end

#eq(a, b) ⇒ Object 



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# File 'lib/happymapper/differ.rb', line 117

def eq(a,b)
  if a.respond_to?(:to_xml) && b.respond_to?(:to_xml)
    a.to_xml == b.to_xml
  else
    a == b
  end
end

#find_changes ⇒ Object 



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# File 'lib/happymapper/differ.rb', line 125

def find_changes
  elements_and_attributes.map(&:name).each do |name|
    el  = @current.send(name)

    if el.is_a?(Array)
      many_changes(el, key: name)
    else
      other_el = get_compared_value(name)
      if ! eq(el, other_el)
        @changes[name] = other_el
      end
    end
  end

  @changes
end

#get_compared_value(key) ⇒ Object 



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# File 'lib/happymapper/differ.rb', line 154

def get_compared_value(key)
  if @compared.respond_to?(key)
    @compared.send(key)
  else
    nil
  end
end

#many_changes(els, key:) ⇒ Object

Handle change for has_many elements



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# File 'lib/happymapper/differ.rb', line 143

def many_changes(els, key:)
  other_els = get_compared_value(key) || []

  els.each_with_index do |el, i|
    if ! eq(el, other_els[i])
      @changes[key] ||= []
      @changes[key] << other_els[i]
    end
  end
end