Wie kann ich ein Juwel in Rails debuggen?

Question

Ich versuche, meinen Rails-Server zu starten, aber ich erhalte den Fehler-Trace unten.

Ich habe die Linie hier erwähnt kommentiert out:

4.2.0/lib/audited/auditor.rb:48:in `audited' 
    from /home/david-vm/Documents/rails_projects/bane/app/models/user.rb:9:in `<class:User>' 

, und ich kann es zu laufen zu bekommen, aber ich bin mir nicht sicher, warum, dass es bricht. Also dachte ich daran, vielleicht byebug zu verwenden, um das Problem zu verfolgen, aber ich kann nicht herausfinden, wie ich das machen würde. Oder gibt es eine andere Möglichkeit, dieses Problem zu beheben? Vielen Dank!

Fehler

/home/david-vm/.rvm/gems/ruby-2.3.0/gems/tiny_tds-0.7.0/lib/tiny_tds/client.rb:74:in `connect': Server name not found in configuration files (TinyTds::Error) 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/tiny_tds-0.7.0/lib/tiny_tds/client.rb:74:in `initialize' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-sqlserver-adapter-4.2.3/lib/active_record/connection_adapters/sqlserver_adapter.rb:280:in `new' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-sqlserver-adapter-4.2.3/lib/active_record/connection_adapters/sqlserver_adapter.rb:280:in `dblib_connect' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-sqlserver-adapter-4.2.3/lib/active_record/connection_adapters/sqlserver_adapter.rb:271:in `connect' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-sqlserver-adapter-4.2.3/lib/active_record/connection_adapters/sqlserver_adapter.rb:59:in `initialize' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-sqlserver-adapter-4.2.3/lib/active_record/sqlserver_base.rb:18:in `new' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-sqlserver-adapter-4.2.3/lib/active_record/sqlserver_base.rb:18:in `sqlserver_connection' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:436:in `new_connection' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:446:in `checkout_new_connection' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:422:in `acquire_connection' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:349:in `block in checkout' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:348:in `checkout' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:263:in `block in connection' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/monitor.rb:214:in `mon_synchronize' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:262:in `connection' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:565:in `retrieve_connection' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_handling.rb:113:in `retrieve_connection' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/connection_handling.rb:87:in `connection' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/model_schema.rb:230:in `table_exists?' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/attribute_methods/primary_key.rb:97:in `get_primary_key' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/attribute_methods/primary_key.rb:85:in `reset_primary_key' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activerecord-4.2.0/lib/active_record/attribute_methods/primary_key.rb:73:in `primary_key' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/audited-activerecord-4.2.0/lib/audited/adapters/active_record.rb:7:in `default_ignored_attributes' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/audited-4.2.0/lib/audited/auditor.rb:48:in `audited' 
from /home/david-vm/Documents/rails_projects/bane/app/models/user.rb:9:in `<class:User>' 
from /home/david-vm/Documents/rails_projects/bane/app/models/user.rb:1:in `<top (required)>' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:457:in `load' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:457:in `block in load_file' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:647:in `new_constants_in' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:456:in `load_file' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:354:in `require_or_load' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:494:in `load_missing_constant' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:184:in `const_missing' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:261:in `const_get' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:261:in `block in constantize' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:259:in `each' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:259:in `inject' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/inflector/methods.rb:259:in `constantize' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:566:in `get' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:597:in `constantize' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise.rb:377:in `get' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise/mapping.rb:81:in `to' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise/mapping.rb:76:in `modules' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise/mapping.rb:93:in `routes' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise/mapping.rb:160:in `default_used_route' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise/mapping.rb:70:in `initialize' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise.rb:411:in `new' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise.rb:411:in `add_mapping' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise/rails/routes.rb:241:in `block in devise_for' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise/rails/routes.rb:240:in `each' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/devise-4.0.1/lib/devise/rails/routes.rb:240:in `devise_for' 
from /home/david-vm/Documents/rails_projects/bane/config/routes.rb:11:in `block in <top (required)>' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:423:in `instance_exec' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:423:in `eval_block' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/actionpack-4.2.0/lib/action_dispatch/routing/route_set.rb:401:in `draw' 
from /home/david-vm/Documents/rails_projects/bane/config/routes.rb:1:in `<top (required)>' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `block in load' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `block in load_paths' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `each' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:40:in `load_paths' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:16:in `reload!' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:26:in `block in updater' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/file_update_checker.rb:75:in `execute' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:27:in `updater' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application/finisher.rb:69:in `block in <module:Finisher>' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `instance_exec' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/initializable.rb:30:in `run' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/initializable.rb:55:in `block in run_initializers' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:228:in `block in tsort_each' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:350:in `block (2 levels) in each_strongly_connected_component' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:431:in `each_strongly_connected_component_from' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:349:in `block in each_strongly_connected_component' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `each' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `call' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:347:in `each_strongly_connected_component' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:226:in `tsort_each' 
from /home/david-vm/.rvm/rubies/ruby-2.3.0/lib/ruby/2.3.0/tsort.rb:205:in `tsort_each' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/initializable.rb:54:in `run_initializers' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application.rb:352:in `initialize!' 
from /home/david-vm/Documents/rails_projects/bane/config/environment.rb:5:in `<top (required)>' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/application.rb:328:in `require_environment!' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:142:in `require_application_and_environment!' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:67:in `console' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!' 
from /home/david-vm/.rvm/gems/ruby-2.3.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>' 
from bin/rails:4:in `require' 
from bin/rails:4:in `<main>' 

User.rb

class User < ActiveRecord::Base 
     # Include default devise modules. Others available are: 
     # :confirmable, :lockable, :timeoutable and :omniauthable 
     devise :ldap_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable 
     after_destroy :ensure_an_admin_remains 
     before_create { generate_token(:auth_token) } 

     # Audit changes made except for the columns as specified below 
     audited except: [:last_seen_at, :sign_in_count, :last_sign_in_at, :last_sign_in_ip, :password_digest] 
     has_associated_audits 

     acts_as_tagger 
     acts_as_taggable_on :roles 

    # associations, methods, etc... 

    end 

aktualisieren

Stellt sich heraus, es ist ein DNS-Problem war, so dass, obwohl meine database.yml hadn‘ t geändert - der Servername funktionierte nicht mehr. Habe gerade das Update hinzugefügt, falls jemand dieses ähnliche Problem hat, könnte es sich lohnen, dies zu überprüfen.

Answer 1

Die Antwort ist IN der Stack-Trace. Es sagt Ihnen genau, welche Datei auf Ihrem System den Fehler hat. Die Tatsache, dass diese Datei von einem Juwel stammt oder in einem anderen Teil Ihres Computers lebt, ist irrelevant.

/home/david-vm/.rvm/gems/ruby-2.3.0/gems/tiny_tds-0.7.0/lib/tiny_tds/client.rb:74:in `connect': Server name not found in configuration files (TinyTds::Error)

öffnen, die Datei (oder was auch immer Datei in der Backtrace scheint am besten geeignet) mit einem Editor, hält einen binding.pry (oder byebug oder Debugger, was auch immer Sie verwenden) dort vor der Zeile es weht weiter (74). Dann starte deine App neu und debugge, als wäre es eine Datei in deiner App.