类型错误（不能转换为符号的字符串）：

当试图我的Rails应用程序中访问一个页面，我现在收到类型错误（不能转换为符号的字符串）：

TypeError (can't convert Symbol into String):

以下是完整的堆栈跟踪。它看起来像我的东西w/twitter-bootstrap-rails宝石。我对么？

TypeError (can't convert Symbol into String): 
    twitter-bootstrap-rails (2.0.4) lib/twitter/bootstrap/rails/twitter-bootstrap-breadcrumbs.rb:20:in `eval' 
    twitter-bootstrap-rails (2.0.4) lib/twitter/bootstrap/rails/twitter-bootstrap-breadcrumbs.rb:20:in `add_breadcrumb' 
    twitter-bootstrap-rails (2.0.4) lib/twitter/bootstrap/rails/twitter-bootstrap-breadcrumbs.rb:11:in `block in add_breadcrumb' 
    activesupport (3.2.2) lib/active_support/callbacks.rb:407:in `_run__1576526312124645203__process_action__39584884573935751__callbacks' 
    activesupport (3.2.2) lib/active_support/callbacks.rb:405:in `__run_callback' 
    activesupport (3.2.2) lib/active_support/callbacks.rb:385:in `_run_process_action_callbacks' 
    activesupport (3.2.2) lib/active_support/callbacks.rb:81:in `run_callbacks' 
    actionpack (3.2.2) lib/abstract_controller/callbacks.rb:17:in `process_action' 
    actionpack (3.2.2) lib/action_controller/metal/rescue.rb:29:in `process_action' 
    actionpack (3.2.2) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action' 
    activesupport (3.2.2) lib/active_support/notifications.rb:123:in `block in instrument' 
    activesupport (3.2.2) lib/active_support/notifications/instrumenter.rb:20:in `instrument' 
    activesupport (3.2.2) lib/active_support/notifications.rb:123:in `instrument' 
    actionpack (3.2.2) lib/action_controller/metal/instrumentation.rb:29:in `process_action' 
    actionpack (3.2.2) lib/action_controller/metal/params_wrapper.rb:205:in `process_action' 
    activerecord (3.2.2) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
    actionpack (3.2.2) lib/abstract_controller/base.rb:121:in `process' 
    actionpack (3.2.2) lib/abstract_controller/rendering.rb:45:in `process' 
    actionpack (3.2.2) lib/action_controller/metal.rb:203:in `dispatch' 
    actionpack (3.2.2) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch' 
    actionpack (3.2.2) lib/action_controller/metal.rb:246:in `block in action' 
    actionpack (3.2.2) lib/action_dispatch/routing/route_set.rb:67:in `call' 
    actionpack (3.2.2) lib/action_dispatch/routing/route_set.rb:67:in `dispatch' 
    actionpack (3.2.2) lib/action_dispatch/routing/route_set.rb:30:in `call' 
    journey (1.0.3) lib/journey/router.rb:68:in `block in call' 
    journey (1.0.3) lib/journey/router.rb:56:in `each' 
    journey (1.0.3) lib/journey/router.rb:56:in `call' 
    actionpack (3.2.2) lib/action_dispatch/routing/route_set.rb:594:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call' 
    rack (1.4.1) lib/rack/etag.rb:23:in `call' 
    rack (1.4.1) lib/rack/conditionalget.rb:25:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/head.rb:14:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/params_parser.rb:21:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/flash.rb:242:in `call' 
    rack (1.4.1) lib/rack/session/abstract/id.rb:205:in `context' 
    rack (1.4.1) lib/rack/session/abstract/id.rb:200:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/cookies.rb:338:in `call' 
    activerecord (3.2.2) lib/active_record/query_cache.rb:64:in `call' 
    activerecord (3.2.2) lib/active_record/connection_adapters/abstract/connection_pool.rb:443:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/callbacks.rb:28:in `block in call' 
    activesupport (3.2.2) lib/active_support/callbacks.rb:405:in `_run__400543747363831273__call__3603336714283860524__callbacks' 
    activesupport (3.2.2) lib/active_support/callbacks.rb:405:in `__run_callback' 
    activesupport (3.2.2) lib/active_support/callbacks.rb:385:in `_run_call_callbacks' 
    activesupport (3.2.2) lib/active_support/callbacks.rb:81:in `run_callbacks' 
    actionpack (3.2.2) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/reloader.rb:65:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/remote_ip.rb:31:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/show_exceptions.rb:56:in `call' 
    railties (3.2.2) lib/rails/rack/logger.rb:26:in `call_app' 
    railties (3.2.2) lib/rails/rack/logger.rb:16:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/request_id.rb:22:in `call' 
    rack (1.4.1) lib/rack/methodoverride.rb:21:in `call' 
    rack (1.4.1) lib/rack/runtime.rb:17:in `call' 
    activesupport (3.2.2) lib/active_support/cache/strategy/local_cache.rb:72:in `call' 
    rack (1.4.1) lib/rack/lock.rb:15:in `call' 
    actionpack (3.2.2) lib/action_dispatch/middleware/static.rb:61:in `call' 
    railties (3.2.2) lib/rails/engine.rb:479:in `call' 
    railties (3.2.2) lib/rails/application.rb:220:in `call' 
    rack (1.4.1) lib/rack/content_length.rb:14:in `call' 
    railties (3.2.2) lib/rails/rack/log_tailer.rb:14:in `call' 
    rack (1.4.1) lib/rack/handler/webrick.rb:59:in `service' 
    /Users/Kyle/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' 
    /Users/Kyle/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' 
    /Users/Kyle/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread'

来源

2012-03-25 Kyle Decot

你能张贴'的lib /叽叽喳喳/引导/导轨/内容Twitter的自举breadcrumbs.rb' – Dogbert 2012-03-25 14:40:59

由于错误的'eval' occures，你可以张贴代码与在插件工作控制器？我想你有一些错误的论点。如果您使用的是符号，请尝试使用'to_s'方法将它转换为sting。 – klump 2012-03-25 15:36:07

你是不是在使用你认为你正在使用的红宝石版本。你刚刚更新红宝石？

如果您正在使用rbenv或rvm，请尝试切换您正在使用的版本，并查看错误是否仍然存在。也许你正在使用jruby？

你可以在这个线程上发布以下命令的结果吗？

which ruby 
ruby --version

来源

2015-09-18 21:40:05 trevorgrayson

类型错误（不能转换为符号的字符串）：

回答

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