ruby-on-rails - activerecord-2.3.14 与 ruby​​ 1.9.2::undefined 方法 `reject' 中断 "4":String

Question

 undefined method `reject' for "4":String 

当我尝试执行@user.update_attributes(params) 时抛出。

参数列表如下

"user"=>{"login"=>"admin", "first_name"=>"Admin", "last_name"=>"Admin", "email"=>"nfsurveytest+admin@neurofocus.com", "location_id"=>"1", "last_login_at_text"=>"Never logged in", "password"=>"", "password_confirmation"=>"", "role_ids"=>"4", "active"=>"true", "is_staff"=>"true"},

错误堆栈如下

/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14   /lib/active_record/associations.rb:1336:in block in collection_accessor_methods'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2918:inblock in assign_attributes'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2914:in each'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2914:inassign_attributes'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/li b/active_record/base.rb:2787:in attributes='
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2671:inupdate_attributes_inside_transaction'
 /home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/transactions.rb:229:in block in with_transaction_returning_status'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/connection_adapters/abstract/database_statements.rb:136:intransaction'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/transactions.rb:182:in transaction'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/transactions.rb:228:inwith_transaction_returning_status'
/home/narendra/.rvm/gems/ruby-1.9.2-p290@nf_schedule/gems/activerecord-2.3.14/lib/active_record/base.rb:2667:in update_attributes'
/home/narendra/workspace/nf_schedule/app/controllers/users_controller.rb:100:inupdate'

我假设这会中断，因为 ruby​​ 1.9.2 中的 String 没有混合“Enumerable”。任何人都可以确认这是一个问题还是我遗漏了什么？

https://github.com/rails/rails/issues/3434

Answer 1

您正在提供一个字符串，而 ActiveRecord 需要一个数组。您可以使用如下方式在 Controller 中重新映射有问题的参数:

if (params[:user])
  params[:user][:role_ids] = [ params[:user][:role_ids] ]
end

您还可以调整您的表单，将字段命名为 role_ids[] 而不仅仅是 role_ids，这样它将作为数组提交。