我已经找到一些修复此问题的人修改了attr_accessible，但我认为这个错误可能出现在gem rake本身？
rake --trace db:seed
- 日志输出开始 -
** Invoke db:seed (first_time)
** Execute db:seed
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
** Invoke db:load_config (first_time)
** Execute db:load_config
** Execute db:abort_if_pending_migrations
rake aborted!
Can't mass-assign protected attributes: authentication_token
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activemodel-3.2.8/lib/active_model/mass_assignment_security/sanitizer.rb:48:in `process_removed_attributes'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activemodel-3.2.8/lib/active_model/mass_assignment_security/sanitizer.rb:20:in `debug_protected_attribute_removal'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activemodel-3.2.8/lib/active_model/mass_assignment_security/sanitizer.rb:12:in `sanitize'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activemodel-3.2.8/lib/active_model/mass_assignment_security.rb:230:in `sanitize_for_mass_assignment'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.8/lib/active_record/attribute_assignment.rb:75:in `assign_attributes'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.8/lib/active_record/base.rb:498:in `initialize'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.8/lib/active_record/persistence.rb:44:in `new'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.8/lib/active_record/persistence.rb:44:in `create'
/Users/devx/passbook_rails_example/db/seeds.rb:1:in `<top (required)>'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `load'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `block in load'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:236:in `load_dependency'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:245:in `load'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/railties-3.2.8/lib/rails/engine.rb:520:in `load_seed'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/activerecord-3.2.8/lib/active_record/railties/databases.rake:309:in `block (2 levels) in <top (required)>'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `call'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/task.rb:205:in `block in execute'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `each'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/task.rb:200:in `execute'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/task.rb:158:in `block in invoke_with_call_chain'
/Users/devx/.rvm/rubies/ruby-1.9.3-p362/lib/ruby/1.9.1/monitor.rb:211:in `mon_synchronize'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/task.rb:151:in `invoke_with_call_chain'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/task.rb:144:in `invoke'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:116:in `invoke_task'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block (2 levels) in top_level'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `each'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:94:in `block in top_level'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:88:in `top_level'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:66:in `block in run'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:133:in `standard_exception_handling'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/lib/rake/application.rb:63:in `run'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/gems/rake-0.9.2.2/bin/rake:33:in `<top (required)>'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/bin/rake:19:in `load'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/bin/rake:19:in `<main>'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/bin/ruby_noexec_wrapper:14:in `eval'
/Users/devx/.rvm/gems/ruby-1.9.3-p362/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => db:seed
- 记录输出结束 -
答案 0 :(得分：2)
这与rake完全没有关系，因为你说它是一个MassAssignment问题，可以修复相关模型的attr_accessible。
这里实际发生的是seed执行的rake任务尝试创建模型（我猜User），似乎给User.create的哈希参数包含authentication_token键，它应如下所示：
User.create name: 'foo', email: 'mail@bar.com', authentication_token: 'qfgsdgf' ...
但是您的User模型在其:authentication_token列表中没有attr_accessible，这就是为什么在尝试创建User时会抛出此错误。
如果您在遇到MassAssignment问题时只需要警告而不是例外，则可以更改配置：
在config / environment / {development，test，production} .rb
中config.active_record.mass_assignment_sanitizer = :strict
答案 1 :(得分：0)
只需将authentication_token添加到attr_accessible即可 例如： 我得到的错误
Media1s-Mac-mini:rails_apps media1$ rake clipsfree_import RAILS_ENV=development csvfile=/Users/media1/Desktop/clips/atemp5/demotracks2/import.csv
rake aborted!
Can't mass-assign protected attributes: title
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activemodel-3.2.11/lib/active_model/mass_assignment_security/sanitizer.rb:48:in `process_removed_attributes'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activemodel-3.2.11/lib/active_model/mass_assignment_security/sanitizer.rb:20:in `debug_protected_attribute_removal'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activemodel-3.2.11/lib/active_model/mass_assignment_security/sanitizer.rb:12:in `sanitize'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activemodel-3.2.11/lib/active_model/mass_assignment_security.rb:230:in `sanitize_for_mass_assignment'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.11/lib/active_record/attribute_assignment.rb:75:in `assign_attributes'
/usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.11/lib/active_record/base.rb:497:in `initialize'
/Users/media1/Desktop/rails_apps/lib/tasks/clipsfree_import.rake:14:in `new'
/Users/media1/Desktop/rails_apps/lib/tasks/clipsfree_import.rake:14:in `block (2 levels) in <top (required)>'
/Users/media1/Desktop/rails_apps/lib/tasks/clipsfree_import.rake:5:in `each'
/Users/media1/Desktop/rails_apps/lib/tasks/clipsfree_import.rake:5:in `block in <top (required)>'
Tasks: TOP => clipsfree_import
(See full trace by running task with --trace)
解决方案： 在models文件夹
中的loopsfree.rb中为attr_accessible添加了属性标题类Loopsfree＆lt;的ActiveRecord :: Base的 attr_accessible：ISRC，：title，：artist，：bpm，：file_name，：genre，：id，：sub_genre 端
希望这会有所帮助:) 快乐的编码