Ruby on rails RoR:ActiveRecord，从AR扩展的模型中的NoMethodError

我已设置了以下模型：

我以前在同一个应用程序的其他地方使用过相同的代码模式，但这一部分仍然可以正常工作（所有的验证都可以正常工作）

---

有人能解释一下我做错了什么。

找出了问题所在：

类Qa:：ErrorType
#联想
有很多错误，：class\u name=>'Qa:：Error'
有很多：评估，：class\u name=>'Qa:：Evaluation'，：through=>：errors

#验证
验证是否存在：内容
验证内容的唯一性
结束

此声明覆盖ActiveRecord提供的错误关联/对象，因此我们失去了ActiveRecord:：Validations提供的所有验证功能。将关联重命名为更具体的对象可以解决问题

类的正确实现：

类Qa:：ErrorType
#联想
有很多：事务错误，：class\u name=>'Qa:：TransactionError'
有很多：评估，：class\u name=>'Qa:：Evaluation'，：through=>:transaction\u错误

#验证
验证是否存在：内容
验证内容的唯一性
结束

---

所有的验证都将在这次更改后按预期工作。我认为将类Qa:：Error重命名为Qa:：TransactionError是可选的。我这样做是为了让我的命名约定在整个应用程序中保持一致。

解决了这个问题。没关系，问题是关联有很多：错误覆盖了ActiveRecord:：Validations提供的“错误”对象，解决方案是用更具体的名称重命名关联 class Qa::Base < ActiveRecord::Base self.abstract_class = true Qa::Base.establish_connection("qa_audit_#{RAILS_ENV}") end

class Qa::ErrorType < Qa::Base set_table_name "error_types"
# Associations has_many :errors, :class_name => 'Qa::Error' has_many :evaluations, :class_name => 'Qa::Evaluation', :through => :errors
# Validations validates_presence_of :content validates_uniqueness_of :content end NoMethodError (undefined method `add_on_blank' for #Class:0x23a3020): e = Qa::ErrorType.first
e.valid? NoMethodError: undefined method

add_on_blank' for #<Class:0x223eeb4>
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:1994:in

method_missing_without_paginate' from /opt/local/lib/ruby/gems/1.8/gems/will_paginate-2.3.14/lib/will_paginate/finder.rb:170:in

method_missing'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/associations/association_collection.rb:380:in

send' from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/associations/association_collection.rb:380:in

method_missing_without_paginate'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/base.rb:2178:in

with_scope' from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/associations/association_proxy.rb:207:in

send'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/associations/association_proxy.rb:207:in

with_scope' from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/associations/association_collection.rb:376:in

method_missing_without_paginate'
    from /opt/local/lib/ruby/gems/1.8/gems/will_paginate-2.3.14/lib/will_paginate/finder.rb:170:in

method_missing' from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/validations.rb:599:in

validates_presence_of'
    from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:182:in

call' from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:182:in

evaluate_method'
    from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:166:in

call' from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:90:in

run'
    from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:90:in

each' from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:90:in

send'
    from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:90:in

run' from /opt/local/lib/ruby/gems/1.8/gems/activesupport-2.3.8/lib/active_support/callbacks.rb:276:in

run_callbacks'
    from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/validations.rb:1110:in

valid_without_callbacks?' from /opt/local/lib/ruby/gems/1.8/gems/activerecord-2.3.8/lib/active_record/callbacks.rb:315:in `valid?' class Qa::ErrorType < Qa::Base set_table_name "error_types"
# Associations has_many :errors, :class_name => 'Qa::Error' has_many :evaluations, :class_name => 'Qa::Evaluation', :through => :errors
# Validations validates_presence_of :content validates_uniqueness_of :content end class Qa::ErrorType < Qa::Base set_table_name "error_types"
# Associations has_many :transaction_errors, :class_name => 'Qa::TransactionError' has_many :evaluations, :class_name => 'Qa::Evaluation', :through => :transaction_errors
# Validations validates_presence_of :content validates_uniqueness_of :content end