Hallo,
ich steige hier überhaupt nicht mehr durch. Ich möchte per migration eine
string-Spalte in eine int-Spalte konvertieren.
In der Spalte sind schon Werte eingetragen. Zum Teil auch Wörter. Aber das müßte
die migration schlucken.
Meine Migration sieht so aus:
class ChangeUsersIdentityKeyToInt < ActiveRecord::Migration
def self.up
change_column :users, :identity_key, :int
end
def self.down
change_column :users, :identity_key, :string
end
end
Wenn ich die migration mit aufrufe, erhalte ich eine Fehlermeldung. Mit --trace
dieses:
** Execute db:migrate
== ChangeUsersIdentityKeyToInt: migrating =====================================
-- change_column(:users, :identity_key, :int)
rake aborted!
You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.[]
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/connection_adapters/abstract/schema_statements.rb:272:in
`type_to_sql'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/connection_adapters/mysql_adapter.rb:371:in
`change_column'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:275:in
`send'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:275:in
`method_missing'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:259:in
`say_with_time'
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:259:in
`say_with_time'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:273:in
`method_missing'
./db/migrate//009_change_users_identity_key_to_int.rb:3:in `real_up'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:212:in
`send'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:212:in
`migrate'
/usr/local/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:212:in
`migrate'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:335:in
`migrate'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:330:in
`each'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:330:in
`migrate'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:297:in
`up'
/usr/local/lib/ruby/gems/1.8/gems/activerecord-1.15.3/lib/active_record/migration.rb:288:in
`migrate'
/usr/local/lib/ruby/gems/1.8/gems/rails-1.2.3/lib/tasks/databases.rake:4
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:392:in `call'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:392:in `execute'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:392:in `each'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:392:in `execute'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:362:in `invoke'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:355:in `synchronize'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:355:in `invoke'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in `top_level'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in `each'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in `top_level'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1761:in
`standard_exception_handling'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1733:in `top_level'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1711:in `run'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1761:in
`standard_exception_handling'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1708:in `run'
/usr/local/lib/ruby/gems/1.8/gems/rake-0.7.3/bin/rake:7
/usr/local/bin/rake:16:in `load'
/usr/local/bin/rake:16
Schlau werde ich daraus nicht.
Viele Grüße
Michael Kastner
--
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