Ruby on rails Rails 4.2+；PG-无法初始化ActiveRecord对象

我有一个简单的AR模型：

class Purchaser < ActiveRecord::Base
  attr_accessor :name
  has_many :purchases

  def initialize(opts={})
    @name = opts[:name]
  end
end

以下是错误：

activerecord-4.2.0.beta1/lib/active_record/transactions.rb:373:in `clear_transaction_record_state': undefined method `[]' for nil:NilClass (NoMethodError)
from activerecord-4.2.0.beta1/lib/active_record/transactions.rb:304:in `ensure in rollback_active_record_state!'
from activerecord-4.2.0.beta1/lib/active_record/transactions.rb:304:in `rollback_active_record_state!'
from activerecord-4.2.0.beta1/lib/active_record/transactions.rb:283:in `save'
from activerecord-4.2.0.beta1/lib/active_record/persistence.rb:34:in `create'
from activerecord-4.2.0.beta1/lib/active_record/relation.rb:141:in `block in create'
from activerecord-4.2.0.beta1/lib/active_record/relation.rb:300:in `scoping'
from activerecord-4.2.0.beta1/lib/active_record/relation.rb:141:in `create'
from activerecord-4.2.0.beta1/lib/active_record/relation.rb:211:in `find_or_create_by'
from activerecord-4.2.0.beta1/lib/active_record/querying.rb:6:in `find_or_create_by'

---

我做错了什么？Ruby 2.1.2，PostgreSQL。

您正在重写ActiveRecord中的

initialize

方法。您应该调用

super

来执行ActiveRecord（父）构造函数。您可以在执行代码后执行。比如：

def initialize(opts={})
   @name = opts[:name]
   super
end

希望这有帮助

def initialize(opts={})
   @name = opts[:name]
   super
end