Question

我有:before_create方法执行一些检查并返回false或true。

def create_subscription_on_gateway 
  gateway = self.keyword.shortcode.provider
  create_subscription = gateway.classify.constantize.new.create_subscription(self.phone,self.keyword_keyword,self.shortcode_shortcode,self.country)
  errors[:base] << "An error has occurred when finding gateway." if gateway.nil?
  errors[:base] << "No gateway found for this shortcode." if create_subscription.nil?
  errors[:base] << "Subscription could not be made." if create_subscription == false
end

现在，如果方法返回false或nil，我可以看到表单页面上的错误。问题是该对象已保存到数据库中。

如果仍然存在相关错误，如何防止保存对象？

Answer 1

您可以引发ActiveRecord :: RecordInvalid异常，它将阻止模型被保存并且不会破坏保存流。

if error?
 errors[:base] << "error"    
 raise ActiveRecord::RecordInvalid.new(self)
end

Answer 2

如何使用验证而不是before_create。然后将create_subscription_on_gateway更改为before_validation

validate :gateway_presence
validate :gateway_found
validate :create_subscription

def gateway_presence
  if # ...your code here
    errors.add(:gateway, "An error has occured..."
  end
end

def gateway_found
  if # ...your code here
    errors.add(:gateway, "An error has occured..."
  end
end

依旧......

当false或nil时，防止before_create方法保存

2 个答案: