CODEWITHSUNDEEP
ruby-on-railsmigration
sjudge
sjudge

Reputation: 3

rails can't migrate: "don't know how to build task VERSION:0"

First post on here so apologies for any noobity. I'm working through the Lynda.com Ruby on Rails 5 Essential training on C9 and encountered a problem trying to migrate back down to 'VERSION:0' with this error message:

rails aborted! Don't know how to build task 'VERSION:0' (see --tasks) /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.1.2/lib/rails/commands/rake/rake_command.rb:21:in block in perform' /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.1.2/lib/rails/commands/rake/rake_command.rb:18:inperform' /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.1.2/lib/rails/command.rb:46:in invoke' /usr/local/rvm/gems/ruby-2.3.1/gems/railties-5.1.2/lib/rails/commands.rb:16:in' /home/ubuntu/workspace/bin/rails:9:in require' /home/ubuntu/workspace/bin/rails:9:in' /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in load' /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.2/lib/spring/client/rails.rb:28:incall' /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.2/lib/spring/client/command.rb:7:in call' /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.2/lib/spring/client.rb:30:inrun' /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.2/bin/spring:49:in <top (required)>' /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.2/lib/spring/binstub.rb:31:inload' /usr/local/rvm/gems/ruby-2.3.1/gems/spring-2.0.2/lib/spring/binstub.rb:31:in <top (required)>' /home/ubuntu/workspace/bin/spring:15:inrequire' /home/ubuntu/workspace/bin/spring:15:in <top (required)>' bin/rails:3:inload' bin/rails:3:in `'

Any help or advice much appreciated

Upvotes: 0

Views: 575

Answers (1)

Rubioli
Rubioli

Reputation: 725

When doing migration in Rails, you can do:

rake db:migrate, which will migrate your new migration to database and add them to scheme.rb.

You can also do rake db:rollback, which will rollback your last migration.

For rollback you can also do rake db:rollback STEP=n, which will roll you back n migrations where n is the number of recent migrations you want to rollback.

IF you want to rollback version of your migration you would apply the migration version as: rake db:migrate VERSION=0 (as @sjudge said in comments)

You can also do rake db:migrate:redo.

There also some other migrations like:

rake db:migrate:redo STEP=n
rake db:migrate:up VERSION=20080906120000
rake db:migrate:down VERSION=20080906120000

Upvotes: 0

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