Ich folge Lynda Ruby on Rails Tutorial. Ich habe nach mehreren erfolglosen Versuchen den Code "rake db: migrate" schon ausgeführt. Ich wurde dann aufgefordert, "rake db: migrate VERSION = 0" auszuführen. Das gibt mir wieder Fehler, dieses Mal kann ich es nicht beheben. Ich habe letzte Nacht und heute Morgen vergeblich versucht.Rake db: migrieren VERSION = 0 Tabelle existiert nicht
Denken Sie daran, wenn ich antworte, bin ich neu in der Codierung, also erklären Sie bitte in einer Weise, die ein Neuling verstehen könnte.
lexi87$ rake db:migrate VERSION=0
== AlterUsers: reverting =====================================================
-- remove_index("admin_users", "username")
rake aborted!
An error has occurred, all later migrations canceled:
Index name 'index_admin_users_on_username' on table 'admin_users' does not exist
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/schema_statements.rb:587:in `index_name_for_remove'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/schema_statements.rb:366:in `remove_index'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:466:in `block in method_missing'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:438:in `block in say_with_time'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:438:in `say_with_time'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:458:in `method_missing'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:334:in `method_missing'
/Users/lexi87/Sites/simple_cms/db/migrate/20130108015542_alter_users.rb:14:in `down'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:376:in `down'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:410:in `block (2 levels) in migrate'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:410:in `block in migrate'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/connection_adapters/abstract/connection_pool.rb:129:in `with_connection'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:389:in `migrate'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:528:in `migrate'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:720:in `block (2 levels) in migrate'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:777:in `call'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:777:in `ddl_transaction'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:719:in `block in migrate'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:700:in `each'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:700:in `migrate'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:574:in `down'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/migration.rb:555:in `migrate'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/gems/activerecord-3.2.9/lib/active_record/railties/databases.rake:179:in `block (2 levels) in <top (required)>'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/bin/ruby_noexec_wrapper:14:in `eval'
/Users/lexi87/.rvm/gems/ruby-1.9.2-p320/bin/ruby_noexec_wrapper:14:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
Und hier ist die rb-Datei.
class AlterUsers < ActiveRecord::Migration
def self.up
rename_table("users", "admin_users")
add_column("admin_users", "username", :string, :limit => 25)
change_column("admin_users", "email", :string, :limit => 100)
rename_column("admin_users", "password", "hashed_password")
add_column("admin_users", "salt", :string, :limit => 40)
puts "*** About to add an index ***"
add_index("admin_users", "username")
end
def self.down
remove_index("admin_users", "username")
remove_column("admin_users", "salt")
remove_column("admin_users", "hashed_password", "password")
remove_column("admin_users", "email", :string, :default => "", :null => false)
remove_column("admin_users", "username")
rename_table("admin_users", "users")
end
end
Vielen Dank. Ich stimme dem überein, was Sie gesagt haben, aber ich habe nur versucht, Schritt für Schritt dem Tutorial zu folgen. Funktioniert alles. –
gut ok gut zu wissen, dass es für Sie gearbeitet hat. Akzeptiere auch die Antworten für diejenigen, die die Probleme gelöst haben, die du bekommen hast, da dies anderen helfen wird, zu finden, was sie später für die gleiche Art von Problemen wollen. Vielen Dank. –
Eugenes Antwort unten half – Anwar