在rails中，我如何才能做到最好？模型样本需要根据第一个模型属性随机化。

Question

In Rails, how do you assign all attributes of an item automatically depending on the first attribute

我问题的第一部分是上面的链接，

我使用示例@ring.display_name = Ring::DISPLAY_NAME.sample获取了一个随机属性。这不是问题。困扰我的是抓住其余的属性。

现在我需要根据随机选择的@ring.gold、@ring.roll和@ring.bonus来获取display_name。现在看看我的模型，我知道这是错误的，但是你能告诉我是否有更好的方法来做这个，一个也许有效的方法？

class Ring < ActiveRecord::Base



  # Display_name
  DISPLAY_NAME = [ 'Beginners', 'Silver', 'Gold', 'Diamond' ]

  # Gold
  if Ring.display_name == 'Beginners'
    GOLD = [ 0 ]
  end
  if Ring.display_name == 'Silver'
    GOLD = [ 0 ]
  end
  if Ring.display_name == 'Gold'
    GOLD = [ 0 ]
  end
  if Ring.display_name == 'Diamond'
    GOLD = [ 0 ]
  end


  # Roll
  if @ring.display_name == 'Beginners'
    ROLL = [ 1 ]
  end  
  if @ring.display_name == 'Silver'
    ROLL = [ 1, 2, 3 ]
  end
  if @ring.display_name == 'Gold'
    ROLL = [ 2, 3, 4 ]
  end
  if @ring.display_name == 'Diamond'
    ROLL = [ 4, 5, 6 ]
  end

  # Bonus
  if Ring.display_name == 'Beginners'
    BONUS = [ ring.user.level + 1 ]
  end  
  if Ring.display_name == 'Silver'
    BONUS = [ ring.user.level + (1 + rand(3)) ]
  end
  if Ring.display_name == 'Gold'
    BONUS = [ ring.user.level + (1 + rand(5)) ]
  end
  if Ring.display_name == 'Diamond'
    BONUS = [ ring.user.level + (1 + rand(8)) ]
  end

  attr_accessible :description, :display_name, :roll, :bonus, :total, :image, :gold


end

正如您可以从代码中看到的那样，我尝试使用'if Ring.display_name‘和'if @ring.display_name’--这两种方法都不起作用，因为我想，不管是谁读了这篇文章，都知道他们不会这么做。

谢谢!

更新了！

这是我目前正在使用的代码。这是不对的，我不太明白如何使用这种技术。看看我有什么。

class Ring < ActiveRecord::Base

  # Display_name
  DISPLAY_NAME = [ 'Silver', 'Gold', 'Diamond' ]

  # Rolls
  ROLL = {
    'Silver'    => [1, 2, 3],
    'Gold'      => [2, 3, 4],
    'Diamond'   => [4, 5, 6]
  }
  self.roll = ROLL[self.display_name]

  BUY = {
    'Silver'    => [100..180],
    'Gold'      => [140..200],
    'Diamond'   => [180..350]
  }
  self.buy = BUY[self.display_name]

  BONUS = {
    'Silver'    => [(1 + rand(3))],
    'Gold'      => [(3 + rand(5))],
    'Diamond'   => [(5 + rand(8))]
  }
  self.bonus = BONUS[self.display_name].call

  attr_accessible :user, :active, :display_name, :description, :gold, :buy, :sell, :roll, :bonus, :total, :image, :description


end

在我的控制器里：

def create
    @ring = Ring.new
    @ring.display_name = Ring::DISPLAY_NAME.sample

    @ring.save

    redirect_to @ring
  end

按照我的理解，如果我告诉它选择一个随机的display_name，所有其他的字段都将根据我在模型中的内容填充，对吗？

Answer 1

您可以根据条件进行散列，如下所示：

class Ring < ActiveRecord::Base

  # Display_name
  DISPLAY_NAME = [ 'Silver', 'Gold', 'Diamond' ]

  # Rolls
  ROLL = {
    'Silver'    => [1, 2, 3],
    'Gold'      => [2, 3, 4],
    'Diamond'   => [4, 5, 6]
  }

  BUY = {
    'Silver'    => [100..180],
    'Gold'      => [140..200],
    'Diamond'   => [180..350]
  }

  BONUS = {
    'Silver'    => ->(){(1 + rand(3))},
    'Gold'      => ->(){(3 + rand(5))},
    'Diamond'   => ->(){(5 + rand(8))}
  }

  attr_accessible :user, :active, :display_name, :description, :gold, :buy, :sell, :roll, :bonus, :total, :image, :description

  def display_name=(name)
    super(name)
    self.roll = ROLL[self.display_name]
    self.buy = BUY[self.display_name]
    self.bonus = BONUS[self.display_name].call
  end
end