1) Did you install mysql properly? a) Try to connect to mysql server from a command line, and run some simple queries against your database. b) Create a simple (pure) Ruby application and try to connect to your database from this application.
If it works fine, then your problem is Rails based. 2) Have a look at database.yml file. adapter database .... ok? On Sat, Dec 5, 2015 at 4:55 AM, Ben Thomas <li...@ruby-forum.com> wrote: > I am trying to follow RESTful Rails Development from O'Reilly by Silvia > Puglisi. > > I have created an app (wikicat), database (MySQL), models (category and > link), controllers (CategoryController show) and routes. I have followed > everything that the book said (taking in to consideration the published > errata) and I am going round and round in circles trying to fix an > ActiveRecord::ConnectionNotEstablished error. > > I am running on Linux Mint 17.2 with: > > Rails version 4.1.4 > mysql version 14.14 Distribution 5.5.46 > > > > I have started mysql server. My Gemfile has been bundled and is shown > below: > > > > source 'https://rubygems.org' > > # Bundle edge Rails instead: gem 'rails', github: 'rails/rails' > gem 'rails', '4.1.4' > gem 'rails-api' > > # Use mysql as the database for Active Record > gem 'mysql2', '~> 0.3.18' > > #Serialiser for JSON > gem 'active_model_serializers' > group :doc do > #bundle exec rake doc:rails generates the API under doc/api > gem 'sdoc', '~>0.4.0' > end > group :development do > #Spring speeds up development by keeping your application > #running in the background. Read more: > #https://github.com/rails/spring > gem 'spring' > end > > > > There isn't an application trace, but there is a framework trace which I > have pasted below: > > activerecord (4.1.4) > lib/active_record/connection_adapters/abstract/connection_pool.rb:541:in > `retrieve_connection' > activerecord (4.1.4) lib/active_record/connection_handling.rb:113:in > `retrieve_connection' > activerecord (4.1.4) lib/active_record/connection_handling.rb:87:in > `connection' > activerecord (4.1.4) lib/active_record/migration.rb:388:in > `check_pending!' > activerecord (4.1.4) lib/active_record/migration.rb:377:in `call' > actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:29:in > `block in call' > activesupport (4.1.4) lib/active_support/callbacks.rb:82:in > `run_callbacks' > actionpack (4.1.4) lib/action_dispatch/middleware/callbacks.rb:27:in > `call' > actionpack (4.1.4) lib/action_dispatch/middleware/reloader.rb:73:in > `call' > actionpack (4.1.4) lib/action_dispatch/middleware/remote_ip.rb:76:in > `call' > actionpack (4.1.4) > lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' > actionpack (4.1.4) > lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' > railties (4.1.4) lib/rails/rack/logger.rb:38:in `call_app' > railties (4.1.4) lib/rails/rack/logger.rb:20:in `block in call' > activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in `block > in tagged' > activesupport (4.1.4) lib/active_support/tagged_logging.rb:26:in > `tagged' > activesupport (4.1.4) lib/active_support/tagged_logging.rb:68:in > `tagged' > railties (4.1.4) lib/rails/rack/logger.rb:20:in `call' > actionpack (4.1.4) lib/action_dispatch/middleware/request_id.rb:21:in > `call' > rack (1.5.5) lib/rack/runtime.rb:17:in `call' > activesupport (4.1.4) > lib/active_support/cache/strategy/local_cache_middleware.rb:26:in `call' > rack (1.5.5) lib/rack/lock.rb:17:in `call' > actionpack (4.1.4) lib/action_dispatch/middleware/static.rb:64:in `call' > railties (4.1.4) lib/rails/engine.rb:514:in `call' > railties (4.1.4) lib/rails/application.rb:144:in `call' > rack (1.5.5) lib/rack/lock.rb:17:in `call' > rack (1.5.5) lib/rack/content_length.rb:14:in `call' > rack (1.5.5) lib/rack/handler/webrick.rb:60:in `service' > /usr/lib/ruby/1.9.1/webrick/httpserver.rb:138:in `service' > /usr/lib/ruby/1.9.1/webrick/httpserver.rb:94:in `run' > /usr/lib/ruby/1.9.1/webrick/server.rb:191:in `block in start_thread' > > > Is there anything in there telling me why I can't get a connection? > Thank you for your patience with my newbie query. > > -- > Posted via http://www.ruby-forum.com/. > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to rubyonrails-talk+unsubscr...@googlegroups.com. > To post to this group, send email to rubyonrails-talk@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/rubyonrails-talk/d08c9ceaeec5c9517ecfa321ede9f8b6%40ruby-forum.com > . > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CAG_K1Sb_G53T1ZQrcgHxreZZznGr%2B9eAdykDJDK_69fufer%3DiQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
