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Ruby ActiveRecord Basics Migrations and Relationships Single Table Inheritance

Posted by Harrison Hondo
Harrison Hondo
7,283 Points

Error when typing Employee.first into console

I am getting this error when typing Employee.first into the rails console while trying to follow along with the video at 8:20. The other commands Customer.first and Account.first work just fine though. 

  Employee Load (1.8ms)  SELECT  `employees`.* FROM `employees`  ORDER BY `employees`.`id` ASC LIMIT 1
Mysql2::Error: Table 'biller_development.employees' doesn't exist: SELECT  `employees`.* FROM `employees`  ORDER BY `employees`.`id` ASC LIMIT 1
ActiveRecord::StatementInvalid: Mysql2::Error: Table 'biller_development.employees' doesn't exist: SELECT  `employees`.* FROM `employees`  ORDER BY `employees`.`id` ASC LIMIT 1
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:299:in `query'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:299:in `block in execute'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract_adapter.rb:466:in `block in log'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract_adapter.rb:460:in `log'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:299:in `execute'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/mysql2_adapter.rb:231:in `execute'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/mysql2_adapter.rb:235:in `exec_query'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:336:in `select'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:32:in `select_all'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/query_cache.rb:70:in `select_all'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/querying.rb:39:in `find_by_sql'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/relation.rb:638:in `exec_queries'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/relation.rb:514:in `load'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/relation.rb:243:in `to_a'
    from /Library/Ruby/Gems/2.0.0/gems/activerecord-4.2.0/lib/active_record/relation/finder_methods.rb:512:in `find_nth_with_limit'
... 5 levels...
    from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.0/lib/rails/commands/console.rb:9:in `start'
    from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Library/Ruby/Gems/2.0.0/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `block in require'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:274:in `require'
    from /Users/hsh2692/biller/bin/rails:8:in `<top (required)>'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `block in load'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Library/Ruby/Gems/2.0.0/gems/activesupport-4.2.0/lib/active_support/dependencies.rb:268:in `load'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'

1 Answer

Charles Smith
Charles Smith
7,575 Points
Charles Smith
Charles Smith
7,575 Points

I think Hampton addresses this in the video. Watch from 6:20 on. If that didn't work, i would make sure that you have setup employee model correctly.

Harrison Hondo
Harrison Hondo
7,283 Points

All he does at 6:20 is another rake db:migrate. A little bit after that he runs into an error doing Customer.first that looks like mine but he fixes it by replacing the ActiveRecord::Base in customer.rb and employee.rb. I previously did both of these things and was then presented with this issue so I'm still not sure what to do about this.

Charles Smith
Charles Smith
7,575 Points
Charles Smith
Charles Smith
7,575 Points

I would look for typos and reload the console if you haven't already. It would seem that it's just not inheriting from the accounts table correctly.

Harrison Hondo
Harrison Hondo
7,283 Points

For some reason, I took a break, and when I came back the problem was fixed. Thanks for trying to assist me with this though.