A fix for error "Mysql2::Error: Table 'transl_development.translations' doesn't exist: SHOW FIELDS FROM translations"

[martinsp]

Using Rails version 3.1.3 (but i think, it could apply for 3.1.x)

Steps to reproduce:

1. create new rails app
2. create translation model
3. add config/initializers/locale.rb file with required configuration
4. run rake db:migrate (the exception is thrown)

I have narrowed it down to this commit in rails: rails/rails@c19bd4f#activerecord/lib/active_record/railtie.rb

During initialization of ActiveRecord it tests translation for 'activerecord.attributes' and 'activerecord.models'
In the described scenario migrations for Translation model has not been run yet, so table is missing and exception is thrown.

[fred]

svenfuchs, could you have a look and merge Martin's patch?
I have the exact same issue and his patch fixes it.

[jfirebaugh]

+1 on fixing this.

However, @martinsp, could you please use a guard clause rather than unless/else?

[kikorb]

if Translation.table_exists?
I18n.backend = I18n::Backend::ActiveRecord.new

I18n::Backend::ActiveRecord.send(:include, I18n::Backend::Memoize)
I18n::Backend::ActiveRecord.send(:include, I18n::Backend::Flatten)
I18n::Backend::Simple.send(:include, I18n::Backend::Memoize)
I18n::Backend::Simple.send(:include, I18n::Backend::Pluralization)

I18n.backend = I18n::Backend::Chain.new(I18n::Backend::Simple.new, I18n.backend)
end

[reggieb]

I get class Translation doesn't exist errors with kikorb's fix. However, a slight modification gets it to work nicely.

require 'i18n/backend/active_record'

Translation  = I18n::Backend::ActiveRecord::Translation

if Translation.table_exists?
  I18n.backend = I18n::Backend::ActiveRecord.new

  I18n::Backend::ActiveRecord.send(:include, I18n::Backend::Memoize)
  I18n::Backend::ActiveRecord.send(:include, I18n::Backend::Flatten)
  I18n::Backend::Simple.send(:include, I18n::Backend::Memoize)
  I18n::Backend::Simple.send(:include, I18n::Backend::Pluralization)

  I18n.backend = I18n::Backend::Chain.new(I18n::Backend::Simple.new, I18n.backend)
end 

This is only an issue during installation when the code is added but the translations table has not been created yet. I think all that is needed is to use the code above in the README as the example of the code to be used in the initializer.

[svenfuchs]

any of you guys interested in taking this repo over? i don't use it myself anymore and i don't really have time either.

drop me an email with your github handle and rubygems email address and i'll add you :)

[kalinchuk]

Anything on this pull request?

[timfjord]

To prevent this issue just use instructions from README