多判断转发的方案

很多场景用到条件分发跳转

方案一：

def aa(condition,option)
  if condition == 1
     todo 1
  elsif condition == 2
     todo 2
  end
end

示例：

def get_charge(serve)
    if serve.is_a? QuantityServe
      charge = serve.compute_price(good.unified_quantity * number, extra)
    elsif serve.is_a? NumberServe
      charge = serve.compute_price(number, extra)
    else
      charge = serve.compute_price(number, extra)
    end
    charge
  end

方案二：

def bb(condition_x,option)
   send(condition_x,option)
end

def condition_1(option)
end

def condition_2(option)
end

示例：

def perform(order_detail_id,action_tag,send_email,current_employee_name)
       Api::OverseasRealOrder.new(order_detail_id,send_email,current_employee_name).send(action_tag)	
    end

方案三：

def cc(obj,option)
   obj = obj || obj.class
   obj.cc(option)
end

class a
  def cc(option)
  end
end

class b
  def self.cc(option)
  end
end

方案四：

class base
   def initialize(objs,option)
     @objs
     @option
   end
   def a
     objs...option
   end
end

示例：

 @checked_items = CartItem.where(session_id: session_id).pending.checked
 SummaryService.new(@checked_items, buyer_id: buyer_id, extra: extra)

class SummaryService
 def initialize(_checked_items, buyer_id: nil, extra: {})
    @checked_items = _checked_items
    @buyer = Buyer.find(buyer_id) if buyer_id
    @extra = extra
    a
    b
  end
  
  def a
  end 
 
  def b
  end 
end