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#519 ✓stale

Migration error with rails 2.1 and drop_table -- still looking for schema_info

Reported by barunio | July 1st, 2008 @ 01:07 AM | in 2.x

After upgrading to Rails 2.1 I noticed that migrations are broken in this way:

I created a new migration as follows:

class TestMigration < ActiveRecord::Migration

def self.up

create_table :blah do |t|

t.integer :something



def self.down

drop_table :blah



If I run the migration all is well. If I try to roll back the migration, though, I get the following error:

Mysql::Error: Table 'myproject_development.schema_info' doesn't exist: select version from schema_info limit 1

The migration is looking for schema_info when it should be looking for schema_migrations.

Note that this error seems to be associated with drop_table in particular, since if my self.down action is "rename_table :blah, :blah2", everything works fine without an error.

Is this a known bug or am I missing something? If it is a bug, is there a patch for it?


Comments and changes to this ticket

  • axs89

    axs89 July 1st, 2008 @ 01:54 AM

    I'm also seeing the same problem - Rails 2.1

  • Ernie Miller

    Ernie Miller July 1st, 2008 @ 02:39 AM

    I can't duplicate this. Copied your specific migration to a file, got the following with rake db:migrate:

    C:\Users\Neo\blah>rake db:migrate

    (in C:/Users/Neo/blah)

    == 20080701012651 TestMigration: migrating ====================================

    -- create_table(:blah)

    -> 0.0030s

    == 20080701012651 TestMigration: migrated (0.0040s) ===========================

    C:\Users\Neo\blah>rake db:migrate VERSION=0

    (in C:/Users/Neo/blah)

    == 20080701012651 TestMigration: reverting ====================================

    -- drop_table(:blah)

    -> 0.0040s

    == 20080701012651 TestMigration: reverted (0.0040s) ===========================

  • barunio

    barunio July 1st, 2008 @ 02:48 AM

    hm, strange. well i just tried it again and still get that error with the exact code i've provided. are you trying this from a new rails project? (i wonder if perhaps the error only occurs when dealing with an older project that was originally created pre-2.1)

  • Ernie Miller

    Ernie Miller July 1st, 2008 @ 03:18 AM

    I did try with a new rails project. From glancing through the migration code, it looked to me like the schema_info table undergoes a one-time conversion to schema_migrations in activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb, in the initialize_schema_migrations_table method, which gets called by Migrator.initialize. Right near the very top of the method, it has a condition:

    unless tables.detect { |t| t == sm_table }

    which should stop the entire method from running once that table has been created.

  • David Mitchell

    David Mitchell July 3rd, 2008 @ 01:27 AM

    I have a project that used 2.0.1 and can confirm that this error is not an isolated incident. It only happens when trying to revert migrations. I dropped the entire database, migrated and then reverted and it died while still doing the first migration back.

  • David Mitchell

    David Mitchell July 3rd, 2008 @ 01:33 AM

    Here's the stack trace for the error:

    ** Invoke db:migrate (first_time)

    ** Invoke environment (first_time)

    ** Execute environment

    ** Execute db:migrate

    == 41 CreateMilestones: reverting =============================================

    -- drop_table(:milestones)

    rake aborted!

    Mysql::Error: Table 'nms_dev.schema_info' doesn't exist: select version from schema_info limit 1

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:147:in `log'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/connection_adapters/mysql_adapter.rb:299:in `execute'

    C:/dev/globaltrack/vendor/plugins/redhillonrails_core/lib/red_hill_consulting/core/active_record/connection_adapters/mysql_adapter.rb:59:in `reverse_foreign_keys'

    C:/dev/globaltrack/vendor/plugins/redhillonrails_core/lib/red_hill_consulting/core/active_record/connection_adapters/abstract_adapter.rb:27:in `drop_table'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/connection_adapters/mysql_adapter.rb:408:in `drop_table'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:330:in `send'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:330:in `method_missing'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:310:in `say_with_time'

    c:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:310:in `say_with_time'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:326:in `method_missing'

    ./db/migrate//041_create_milestones.rb:15:in `down_without_benchmarks'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:264:in `send'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:264:in `migrate'

    c:/ruby/lib/ruby/1.8/benchmark.rb:293:in `measure'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:264:in `migrate'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:430:in `migrate'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:420:in `each'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:420:in `migrate'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:361:in `down'

    c:/ruby/lib/ruby/gems/1.8/gems/activerecord-2.1.0/lib/active_record/migration.rb:341:in `migrate'


    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:546:in `call'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:546:in `execute'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:541:in `each'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:541:in `execute'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:508:in `invoke_with_call_chain'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:501:in `synchronize'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:501:in `invoke_with_call_chain'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:494:in `invoke'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1931:in `invoke_task'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in `top_level'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in `each'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1909:in `top_level'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1948:in `standard_exception_handling'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1903:in `top_level'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1881:in `run'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1948:in `standard_exception_handling'

    c:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.1/lib/rake.rb:1878:in `run'


    C:/ruby/bin/rake:16:in `load'


  • David Mitchell

    David Mitchell July 3rd, 2008 @ 07:26 AM

    I took a closer look at the stack trace, updated all my plugins and it looks like my problem was related to an older version of the redhillonrails plugins. Hope that helps somebody who was in the same situation.

  • josh

    josh October 5th, 2008 @ 03:16 PM

    • State changed from “new” to “stale”
    • Tag changed from 2.1, bug, migrations to 2.1, bug, migrations

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