title: Can't convert fixnum to string during rake db:create
body: <p>Just created a new blog app using rails 3.0</p>
  
  <p>my model is simple:</p>
  
  <pre><code>class Post &lt; ActiveRecord::Base
    has_many :comments
  end
  
  class Comment &lt; ActiveRecord::Base
    belongs_to :post
  end
  </code></pre>
  
  <p>I used the commands: rails generate scaffold post title:string body:text etc.</p>
  
  <p>to create these files.</p>
  
  <p>Now I wanted to generated the db using:</p>
  
  <p>rake db:create </p>
  
  <p>I got the error:</p>
  
  <pre><code>rake aborted!
  can't convert Fixnum into String
  </code></pre>
  
  <p>Any ideas what the issue can be?</p>
  
  <p>I'm following this tutorial: <a href="http://sixrevisions.com/web-development/how-to-create-a-blog-from-scratch-using-ruby-on-rails/" rel="noreferrer">http://sixrevisions.com/web-development/how-to-create-a-blog-from-scratch-using-ruby-on-rails/</a></p>
  
  <p><strong>Here is the trace:</strong></p>
  
  <pre><code>** Invoke db:create (first_time)
  ** Invoke db:load_config (first_time)
  ** Invoke rails_env (first_time)
  ** Execute rails_env
  ** Execute db:load_config
  ** Execute db:create
  rake aborted!
  can't convert Fixnum into String
  /Library/Ruby/Gems/1.8/gems/mysql2-0.2.4/lib/mysql2/client.rb:36:in `connect'
  /Library/Ruby/Gems/1.8/gems/mysql2-0.2.4/lib/mysql2/client.rb:36:in `initialize'
  /Library/Ruby/Gems/1.8/gems/mysql2-0.2.4/lib/active_record/connection_adapters/mysql2_adapter.rb:14:in `new'
  /Library/Ruby/Gems/1.8/gems/mysql2-0.2.4/lib/active_record/connection_adapters/mysql2_adapter.rb:14:in `mysql2_connection'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in `send'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:230:in `new_connection'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:238:in `checkout_new_connection'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:194:in `checkout'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `loop'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `checkout'
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:189:in `checkout'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:96:in `connection'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:318:in `retrieve_connection'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:97:in `retrieve_connection'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in `connection'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/railties/databases.rake:68:in `create_database'
  /Library/Ruby/Gems/1.8/gems/activerecord-3.0.0/lib/active_record/railties/databases.rake:33
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain'
  /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run'
  /Library/Ruby/Gems/1.8/gems/rake-0.8.7/bin/rake:31
  /usr/bin/rake:19:in `load'
  /usr/bin/rake:19
  </code></pre>
  
  <p>database.yaml:</p>
  
  <pre><code># MySQL.  Versions 4.1 and 5.0 are recommended.
  #
  # Install the MySQL driver:
  #   gem install mysql2
  #
  # And be sure to use new-style password hashing:
  #   http://dev.mysql.com/doc/refman/5.0/en/old-client.html
  development:
    adapter: mysql2
    encoding: utf8
    reconnect: false
    database: myblog_development
    pool: 5
    username: root
    password: 123
    socket: /tmp/mysql.sock
  
  # Warning: The database defined as "test" will be erased and
  # re-generated from your development database when you run "rake".
  # Do not set this db to the same as development or production.
  test:
    adapter: mysql2
    encoding: utf8
    reconnect: false
    database: myblog_test
    pool: 5
    username: root
    password: 123
    socket: /tmp/mysql.sock
  
  production:
    adapter: mysql2
    encoding: utf8
    reconnect: false
    database: myblog_production
    pool: 5
    username: root
    password: 123
    socket: /tmp/mysql.sock
  </code></pre>
  
  <p>migrations:</p>
  
  <pre><code>class CreatePosts &lt; ActiveRecord::Migration
    def self.up
      create_table :posts do |t|
        t.string :title
        t.text :body
  
        t.timestamps
      end
    end
  
    def self.down
      drop_table :posts
    end
  end
  </code></pre>
  
  <p>next migration:</p>
  
  <pre><code>class CreateComments &lt; ActiveRecord::Migration
    def self.up
      create_table :comments do |t|
        t.string :name
        t.text :body
        t.references :post
  
        t.timestamps
      end
    end
  
    def self.down
      drop_table :comments
    end
  end
  </code></pre>