耙db：迁移mysql错误

Question

I am new to ROR. I was just following the tutorials at tutorials point . I have installed following gems:

abstract (1.0.0)  
actionmailer (3.0.3)  
actionpack (3.0.3)  
activemodel (3.0.3)  
activerecord (3.0.3)  
activerecord-mysql-adapter-flags (0.0.3)  
activerecord-ruby_mysql-adapter (0.1)  
activeresource (3.0.3)  
activesupport (3.0.3)  
arel (2.0.6)  
bigdecimal (1.1.0)  
builder (2.1.2)  
bundler (1.3.5)  
erubis (2.6.6)  
i18n (0.4.2)  
io-console (0.3)  
json (1.5.5)  
mail (2.2.14)  
mime-types (1.16)  
minitest (2.5.1)  
mysql (2.8.1 x86-mingw32)  
polyglot (0.3.1)  
rack (1.2.1)  
rack-mount (0.6.13)  
rack-test (0.5.6)  
rails (3.0.3)  
railties (3.0.3)  
rake (0.9.2.2)  
rdoc (3.9.5)   
thor (0.14.6)  
treetop (1.4.9)  
tzinfo (0.3.23)  

When I tried to run rake db:create it gave me following warnings, but still created the databases.

F:\Rails Applications\Library>rake db:create
WARNING: 'require 'rake/rdoctask'' is deprecated.  Please use 'require 'rdoc/tas
k' (in RDoc 2.4.2+)' instead.
    at C:/Ruby193/lib/ruby/1.9.1/rake/rdoctask.rb
WARNING: Global access to Rake DSL methods is deprecated.  Please include
    ...  Rake::DSL into classes and modules which use the Rake DSL methods.
WARNING: DSL method Library::Application#task called at C:/Ruby193/lib/ruby/gems
/1.9.1/gems/railties-3.0.3/lib/rails/application.rb:214:in `initialize_tasks'

and at the end of long output it said:

[NOTE]
You may have encountered a bug in the Ruby interpreter or extension libraries.
Bug reports are welcome.
For details: http://www.ruby-lang.org/bugreport.html


This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

But it has created the databases named library_development and library_testing in mysql.

Now when I run rake db:migrate it says the following:

 F:\Rails Applications\Library>rake db:migrate
WARNING: 'require 'rake/rdoctask'' is deprecated.  Please use 'require 'rdoc/tas
k' (in RDoc 2.4.2+)' instead.
    at C:/Ruby193/lib/ruby/1.9.1/rake/rdoctask.rb
WARNING: Global access to Rake DSL methods is deprecated.  Please include
    ...  Rake::DSL into classes and modules which use the Rake DSL methods.
WARNING: DSL method Library::Application#task called at C:/Ruby193/lib/ruby/gems
/1.9.1/gems/railties-3.0.3/lib/rails/application.rb:214:in `initialize_tasks'
rake aborted!
Mysql::Error: query: not connected: CREATE TABLE `schema_migrations` (`version`
varchar(255) NOT NULL) ENGINE=InnoDB

the gemfile looks like this

source 'http://rubygems.org'

gem 'rails', '3.0.3'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

#gem 'sqlite3-ruby', :require => 'sqlite3'
gem 'mysql', '~>2.8.1'
gem 'activerecord-ruby_mysql-adapter', '~>0.1' 
gem 'rdoc'
# Use unicorn as the web server
# gem 'unicorn'

# Deploy with Capistrano
# gem 'capistrano'

# To use debugger (ruby-debug for Ruby 1.8.7+, ruby-debug19 for Ruby 1.9.2+)
# gem 'ruby-debug'
# gem 'ruby-debug19'

# Bundle the extra gems:
# gem 'bj'
# gem 'nokogiri'
# gem 'sqlite3-ruby', :require => 'sqlite3'
# gem 'aws-s3', :require => 'aws/s3'

# Bundle gems for the local environment. Make sure to
# put test-only gems in this group so their generators
# and rake tasks are available in development mode:
# group :development, :test do
#   gem 'webrat'
# end

Can anyone please help me???

Answer 1

Rails 3.0.3 is fairly old. The latest 3.x branch is at 3.2.18 or newer. I suspect you might be using a newer gem with a version of Rails that's too old for it to function with. If you post your Gemfile as a gist it should be easier to determine which gems could possibly be problematic.

Typically in such a case unbounded gems ie those without an explicit version set in the Gemfile will attempt to use a newer version of the Gem than the version of Rails can support and will break the app.

Update: The Gemfile you added only has a single unbounded gem: rdoc. This gem seems to be using an older way of integrating tasks and so might be breaking with a newer version of rake. We'll adjust both the versions of rake and the version of rdoc to match the time period that rails 3.0.3 came from.

The version of rdoc that was released closest to rails 3.0.3 is 3.0.1. Change your Gemfile so instead of

gem 'rdoc'

it says

gem 'rdoc', '~> 3.0.1'

Next, run the following commands to install the closest version of rake to rails 3.0.3

gem uninstall rake --version 0.9.2.2
gem install rake --version 0.8.7

Now, run bundler to install the version of rdoc you've asked for:

bundle install

And finally use bundler to execute your rake command using the specific versions of the gems you've asked to use in the Gemfile:

bundle exec rake db:create
bundle exec rake db:migrate

If that doesn't solve it, you can always force using the specific version of rake you want to use like so:

bundle exec rake _0.8.7_ db:create

Hope this helps.