Migration and updating database

I have an application using ruby on rails 3 (rubystack). I’m on windows
I want to update the database and here is what I get after typing rake
db:seed --trace

(in C:/Users/dell/BitNami RubyStack Development projects/server)
** Invoke db:seed (first_time)
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:abort_if_pending_migrations
You have 10 pending migrations:
20110204225837 CreateApps
20110205005643 CreateRatings
20110205154017 CreateVestalVersions
20110205165712 CreateVisuals
20110205165923 AddAttachmentImageToVisual
20110206210830 CreateTargets
20110206210905 CreateAppTargets
20110209223713 CreatePermissions
20110209223746 CreateAppPermissions
20110209224341 CreateComments
Run “rake db:migrate” to update your database then try again.

so as it seems that I have to migrate I type rake db:migrate --trace and
this is what I get :
(in C:/Users/dell/BitNami RubyStack Development projects/server)
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:migrate
== CreateApps: migrating

– create_table(:apps)
rake aborted!
An error has occurred, all later migrations canceled:

Mysql2::Error: Table ‘apps’ already exists: CREATE TABLE apps (id
int(11) DE
FAULT NULL auto_increment PRIMARY KEY, creator varchar(255),
packageName var
char(255), title varchar(255), description text, appId
varchar(255), cate gory varchar(255), recentChanges text, email varchar(255), phone
255), website varchar(255), version varchar(255), versionCode
int(11), ap pType varchar(255), promoText text, promoVideo varchar(255),
screenshotCou nt int(11), price varchar(255), priceCurrency varchar(255),
installSize v
archar(255), created_at datetime, updated_at datetime) ENGINE=InnoDB
ection_adapters/abstract_adapter.rb:202:in `rescue in log’…

I don’t understand what’s wrong. What should I do ?
Please help me this is the first time I use ruby on rails and I’m not
that confortable with databases

On Tue, Oct 25, 2011 at 2:23 PM, fadwa ferodia [email protected]

** Execute environment
20110209223746 CreateAppPermissions
== CreateApps: migrating
varchar(255), cate C:/rails/ruby/lib/ruby/gems/1.9.1/gems/activerecord-3.0.3/lib/active_record/conn ection_adapters/abstract_adapter.rb:202:inrescue in log’…

I don’t understand what’s wrong. What should I do ?

These are fairly old migrations (Feb 2011).

Maybe they had been run before in your database (and created the
table apps). Could you confirm that ?

You can check that the table ‘apps’ is there with going into your mysql
database and executing

show tables;

At the time (Feb 2011 ?) that will have left entries in the table

You can check the current status with going into your
database (with $ mysql command) and executing:

SELECT * FROM schema_migrations;

I presume those older migrations 201102… are currently not in the
schema_migrations list.

Maybe (??) someone has executed rake db:migration:down or
reverted the migrations in some other way and maybe that
step did not properly drop the table.

Could you print the content of the migration

$ cat db/migrate/20110204225837_create_apps.rb

In that case you could end-up with an inconsistency. The
table (apps) is still in the database, but the database thinks
the migration was never executed or was reverted.

This is only a possible scenario, not sure this is the actual
case in your system.

As a reference, this is how it should work if successful:

[email protected]:~/data/temp/fancy$ cat db/migrate/20111025163743_create_apps.rb class CreateApps < ActiveRecord::Migration def change create_table :apps do |t|


[email protected]:~/data/temp/fancy$ rake db:migrate
== CreateApps: migrating

– create_table(:apps)
NOTICE: CREATE TABLE will create implicit sequence “apps_id_seq” for
column “apps.id”
NOTICE: CREATE TABLE / PRIMARY KEY will create implicit index
for table “apps”
-> 0.0099s
== CreateApps: migrated (0.0100s)

[email protected]:~/data/temp/fancy$ psql fancy_development
psql (8.4.9)
Type “help” for help.

fancy_development=# select * from schema_migrations;

(1 row)

fancy_development=# \d
List of relations
Schema | Name | Type | Owner
public | apps | table | peterv
public | apps_id_seq | sequence | peterv
public | schema_migrations | table | peterv
(3 rows)



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