Module: PlusPlus::Base

Defined in:
lib/plus_plus/base.rb

Instance Method Summary collapse

Instance Method Details

#plus_plus(*args) ⇒ Object 



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# File 'lib/plus_plus/base.rb', line 3

def plus_plus(*args)
  options = args.extract_options!
  association, column = args

  self.after_create {
    self.plus_plus_on_create_or_destroy association, column, options
  }

  self.after_destroy {
    self.plus_plus_on_create_or_destroy association, column, options
  }
end

#plus_plus_on_change(*args) ⇒ Object 



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# File 'lib/plus_plus/base.rb', line 16

def plus_plus_on_change(*args)
  options = args.extract_options!
  association, column = args

  self.after_update do
    association_model = self.send(association)
    raise "No association #{association}" if association_model.nil?
    raise "No :changed option specified" if options[:changed].nil?
    raise "No :plus option specified" if options[:plus].nil?
    raise "No :minus option specified" if options[:minus].nil?
    return unless self.changes.include?(options[:changed])

    dup     = self.dup
    changed = options[:changed]
    offset  = if options[:value]
      options[:value].respond_to?(:call) ? self.instance_exec(&options[:value]) : options[:value]
    else
      1
    end

    self.changes.each { |k, v| dup[k] = v.first }  # Create a 'snapshot' of what the model did look like
    prev_satisfied_for_minus = options[:minus].respond_to?(:call) ? dup.instance_exec(&options[:minus]) : dup.send(changed) == options[:minus]
    self_satisfied_for_plus = options[:plus].respond_to?(:call) ? self.instance_exec(&options[:plus]) : self.send(changed) == options[:plus]
    self_satisfied_for_minus = options[:minus].respond_to?(:call) ? self.instance_exec(&options[:minus]) : self.send(changed) == options[:minus]
    prev_satisfied_for_plus = options[:plus].respond_to?(:call) ? dup.instance_exec(&options[:plus]) : dup.send(changed) == options[:plus]

    updated_val = if prev_satisfied_for_minus && self_satisfied_for_plus
      association_model.send(column) + offset
    elsif prev_satisfied_for_plus && self_satisfied_for_minus
      association_model.send(column) - offset
    else
      nil
    end

    association_model.send options[:update_method] || :update_columns, {column => updated_val} if updated_val
  end
end