Rake db:migrate behaving different for different environments

Rails
1

I am wondering in my application for past few days, why the rake
db:migrate is behaving differently for different environments. Any
clue is appreciated

Application name : project
Database name : project_my_own
Environment name : my_own

If I use simply:
rake db:migrate

It works, but say I have a separate environment called “my_own” and if
I run:
rake db:migrate RAILS_ENV=my_own

It blows up and gives several line of stack trace:
C:\project>rake db:migrate RAILS_ENV=my_own --trace
(in C:/project)
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
rake aborted!
Mysql::Error: Table ‘project_my_own.contents’ doesn’t exist: SHOW
FIELDS FROM contents
C:/project/vendor/rails/activerecord/lib/active_record/
connection_adapters/abstract_adapter.rb:189:in log' C:/project/vendor/rails/activerecord/lib/active_record/ connection_adapters/mysql_adapter.rb:309:inexecute_without_reconnect’
C:/project/vendor/plugins/manage/initializers/
mysql_adapter_extension.rb:7:in execute' C:/project/vendor/rails/activerecord/lib/active_record/ connection_adapters/mysql_adapter.rb:440:incolumns’
C:/project/vendor/rails/activerecord/lib/active_record/base.rb:1220:in
columns' C:/project/vendor/rails/activerecord/lib/active_record/base.rb:1239:incontent_columns’
C:/project/vendor/plugins/acts_as_versioned/lib/acts_as_versioned.rb:
409:in create_versioned_table' C:/project/vendor/plugins/acts_as_versioned/lib/acts_as_versioned.rb: 261:inacts_as_versioned’
C:/project/app/models/content.rb:16
C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
gem_original_require' C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:inrequire’
C:/project/vendor/rails/activesupport/lib/active_support/
dependencies.rb:148:in require' C:/project/vendor/rails/activesupport/lib/active_support/ dependencies.rb:507:innew_constants_in’
C:/project/vendor/rails/activesupport/lib/active_support/
dependencies.rb:148:in require' C:/project/vendor/rails/activesupport/lib/active_support/ dependencies.rb:254:inrequire_or_load’
C:/project/vendor/rails/activesupport/lib/active_support/
dependencies.rb:413:in load_missing_constant' C:/project/vendor/rails/activesupport/lib/active_support/ dependencies.rb:77:inconst_missing’
C:/project/vendor/rails/activesupport/lib/active_support/
dependencies.rb:89:in const_missing' C:/project/app/models/comment.rb:14 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:ingem_original_require’
C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
require' C:/project/vendor/rails/activesupport/lib/active_support/ dependencies.rb:148:inrequire’
C:/project/vendor/rails/activesupport/lib/active_support/
dependencies.rb:507:in new_constants_in' C:/project/vendor/rails/activesupport/lib/active_support/ dependencies.rb:148:inrequire’
C:/project/vendor/rails/activesupport/lib/active_support/
dependencies.rb:254:in require_or_load' C:/project/vendor/rails/activesupport/lib/active_support/ dependencies.rb:213:independ_on’
C:/project/vendor/rails/activesupport/lib/active_support/
dependencies.rb:133:in require_dependency' C:/project/config/../vendor/rails/railties/lib/initializer.rb:364:inload_application_classes’
C:/project/config/…/vendor/rails/railties/lib/initializer.rb:363:in
each' C:/project/config/../vendor/rails/railties/lib/initializer.rb:363:inload_application_classes’
C:/project/config/…/vendor/rails/railties/lib/initializer.rb:361:in
each' C:/project/config/../vendor/rails/railties/lib/initializer.rb:361:inload_application_classes’
C:/project/config/…/vendor/rails/railties/lib/initializer.rb:182:in
process' C:/project/config/../vendor/rails/railties/lib/initializer.rb:112:insend’
C:/project/config/…/vendor/rails/railties/lib/initializer.rb:112:in
run' C:/project/config/environment.rb:9 C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:ingem_original_require’
C:/ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in
require' C:/project/vendor/rails/activesupport/lib/active_support/ dependencies.rb:148:inrequire’
C:/project/vendor/rails/activesupport/lib/active_support/
dependencies.rb:507:in new_constants_in' C:/project/vendor/rails/activesupport/lib/active_support/ dependencies.rb:148:inrequire’
C:/project/vendor/rails/railties/lib/tasks/misc.rake:3
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:617:in call' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:617:inexecute’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:612:in each' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:612:inexecute’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:578:in
invoke_with_call_chain' C:/ruby/lib/ruby/1.8/monitor.rb:242:insynchronize’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:571:in
invoke_with_call_chain' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:588:ininvoke_prerequisites’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:in each' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:585:ininvoke_prerequisites’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:577:in
invoke_with_call_chain' C:/ruby/lib/ruby/1.8/monitor.rb:242:insynchronize’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:571:in
invoke_with_call_chain' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:564:ininvoke’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2019:in
invoke_task' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:intop_level’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:in each' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1997:intop_level’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2036:in
standard_exception_handling' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1991:intop_level’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1970:in run' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:2036:instandard_exception_handling’
C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/lib/rake.rb:1967:in run' C:/ruby/lib/ruby/gems/1.8/gems/rake-0.8.3/bin/rake:31 C:/ruby/bin/rake:16:inload’
C:/ruby/bin/rake:16

2

On 26 Dec 2008, at 18:29, Gourav T. wrote:

rake db:migrate

It works, but say I have a separate environment called “my_own” and if
I run:
rake db:migrate RAILS_ENV=my_own

That environment has class_caching turned on which means all models/
controllers are preloaded when the framework is loaded. If when the
model is loaded it tries to inspect its table (as the
acts_as_versioned plugins seems to make it do) and that table doesn’t
exist yet then bad things will happen.

Fred

3

Hey Gourav,

Are you using the Content model or the Comment model in either config/
environment.rb or config/environments/my_own.rb?

-Ryan

4

Hi Fred

Awesome! you are right, class_caching was turned on. I turned it off
and it worked!
But, I would like to pre-load the the models and controllers when the
framework is loaded, so is there any other option to have caching
enabled and I can make it work?
On Dec 26, 2:50 pm, Frederick C. [email protected]

5

Hey Ryan,
I am not using Content and Comment model in any of these files (config/
environment.rb, config/environments/my_own.rb)

-Gourav

6

On 26 Dec 2008, at 21:07, Gourav T. wrote:

Hi Fred

Awesome! you are right, class_caching was turned on. I turned it off
and it worked!
But, I would like to pre-load the the models and controllers when the
framework is loaded, so is there any other option to have caching
enabled and I can make it work?

There’s not a really good solution to this. One way is to have a
special environment just for running migrations (that obviously uses
the same database as normal) that has cache classes set to false.

Fred

7

Many thanks Fred :slight_smile:

I think this solution works fine for now.

On Dec 26, 4:57 pm, Frederick C. [email protected]