我是编程的新手,当我在尝试heroku rake db:migrate时遇到了这个问题时,我正在关注Michael Hartl的Rails教程
(in /app)
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/file_utils.rb:10: warning: already initialized constant RUBY
/app/.bundle/gems/ruby/1.9.1/gems/rake-0.9.2/lib/rake/file_utils.rb:84: warning: already initialized constant LN_SUPPORTED
rake aborted!
Invalid DATABASE_URL
(erb):9:in `rescue in <main>'
(erb):6:in `<main>'
/usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `eval'
/usr/ruby1.9.2/lib/ruby/1.9.1/erb.rb:753:in `result'
/app/.bundle/gems/ruby/1.9.1/gems/railties-3.0.1/lib/rails/application/configuration.rb:86:in `database_configuration'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/railtie.rb:58:in `block (2 levels) in <class:Railtie>'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `instance_eval'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:36:in `execute_hook'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:43:in `block in run_load_hooks'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:42:in `each'
/app/.bundle/gems/ruby/1.9.1/gems/activesupport-3.0.1/lib/active_support/lazy_load_hooks.rb:42:in `run_load_hooks'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/base.rb:1867:in `<top (required)>'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/migration.rb:486:in `initialize'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/migration.rb:433:in `new'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/migration.rb:433:in `up'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/migration.rb:415:in `migrate'
/app/.bundle/gems/ruby/1.9.1/gems/activerecord-3.0.1/lib/active_record/railties/databases.rake:142:in `block (2 levels) in <top (required)>'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:634:in `call'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:634:in `block in execute'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:629:in `each'
/usr/ruby1.9.2/lib/ruby/1.9.1/rake.rb:629:in `execute' …