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Ruby ActiveRecord Basics Migrations and Relationships Single Table Inheritance

Michael Baker
Michael Baker
5,709 Points
Posted by Michael Baker
Michael Baker
5,709 Points

Error on a.type = "Customer"

when Hampton sets a = Account.first and then runs a.type = "Customer"

I get the error below.

irb(main):007:0> a.type = "Customer"
NoMethodError: undefined method `type=' for #<Account:0x007fb0688bb210>
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activemodel-4.2.1/lib/active_model/attribute_methods.rb:433:in `method_missing'
    from (irb):7
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/console.rb:110:in `start'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/console.rb:9:in `start'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands.rb:17:in `<top (required)>'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:in `require'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:in `block in require'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:in `require'
    from /Users/MichaelBaker/treehouse/projects/biller/bin/rails:8:in `<top (required)>'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:in `load'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:in `block in load'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:240:in `load_dependency'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:in `load'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/commands/rails.rb:6:in `call'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/command_wrapper.rb:38:in `call'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:183:in `block in serve'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:156:in `fork'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:156:in `serve'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:131:in `block in run'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:125:in `loop'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:125:in `run'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application/boot.rb:18:in `<top (required)>'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from -e:1:in `<main>'irb(main):008:0>

6 Answers

Amanda Wagner
Amanda Wagner
6,070 Points

Oops, sorry for the misunderstanding.

Sounds like what you need to do is do a new migration called AddTypeToAccounts. Then in the migration file do

def change add_column :accounts, :type, :string

Try that and then run another rake db:migrate

Amanda Wagner
Amanda Wagner
6,070 Points
Amanda Wagner
Amanda Wagner
6,070 Points

Are you in irb or rails console? Rails console is what you want if you're dealing with the database.

Amanda Wagner
Amanda Wagner
6,070 Points
Amanda Wagner
Amanda Wagner
6,070 Points

That kind of an error usually means that it's not finding the "type" column in the Accounts table. Something may have happened with the migration. In your migration file for CreateAccounts, do you have t.string :type?

Michael Baker
Michael Baker
5,709 Points
Michael Baker
Michael Baker
5,709 Points

Hi Amanda - thanks for your reply.

I believe I'm in the rails console - this is what I'm doing in terminal:

```Michaels-Air:biller MichaelBaker$ rails c

Loading development environment (Rails 4.2.1) irb(main):001:0> Customer.first

Customer Load (0.3ms) SELECT accounts.* FROM accounts ORDER BY accounts.id ASC LIMIT 1 => #<Customer id: 1, name: "Bob's Emporium", email: nil, about: nil, created_at: "2015-04-29 16:59:04", updated_at: "2015-04-29 16:59:04">

irb(main):002:0> a = Account.first

Account Load (0.4ms) SELECT accounts.* FROM accounts ORDER BY accounts.id ASC LIMIT 1 => #<Account id: 1, name: "Bob's Emporium", email: nil, about: nil, created_at: "2015-04-29 16:59:04", updated_at: "2015-04-29 16:59:04">

irb(main):003:0> a.type = "Customer"

NoMethodError: undefined method type=' for #<Account:0x007fb0658b6858> from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activemodel-4.2.1/lib/active_model/attribute_methods.rb:433:inmethod_missing' from (irb):3 from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/console.rb:110:in start' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/console.rb:9:instart' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:68:in console' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:39:inrun_command!' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands.rb:17:in <top (required)>' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:inrequire' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:in block in require' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:240:inload_dependency' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:274:in require' from /Users/MichaelBaker/treehouse/projects/biller/bin/rails:8:in<top (required)>' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:in load' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:inblock in load' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:240:in load_dependency' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/dependencies.rb:268:inload' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/commands/rails.rb:6:in call' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/command_wrapper.rb:38:incall' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:183:in block in serve' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:156:infork' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:156:in serve' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:131:inblock in run' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:125:in loop' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application.rb:125:inrun' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/application/boot.rb:18:in <top (required)>' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:inrequire' from /Users/MichaelBaker/.rbenv/versions/2.2.2/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in require' from -e:1:in<main>'irb(main):004:0>```

Michael Baker
Michael Baker
5,709 Points
Michael Baker
Michael Baker
5,709 Points

When I first followed Hampton's steps, I had a typo and only had t.string rather than t.string :type. I've since added and done rake db:migrate.

Amanda Wagner
Amanda Wagner
6,070 Points

Is it working for you now?

Michael Baker
Michael Baker
5,709 Points
Michael Baker
Michael Baker
5,709 Points

no -I did that before posting the errors above.