About my application’s environment

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E:\railsdoc\mybook>ruby script\server
=> Booting Mongrel
=> Rails 2.3.5 application starting on http://0.0.0.0:3000
e:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/connection_specification.rb:62:in `establish_connection': development database is not configured (ActiveRecord::AdapterNotSpecified)
        from e:/Ruby/lib/ruby/gems/1.8/gems/activerecord-2.3.5/lib/active_record/connection_adapters/abstract/connection_specification.rb:55:in `establish_connection'
        from e:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:438:in `initialize_database'
        from e:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:141:in `process'
        from e:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in `send'
        from e:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/initializer.rb:113:in `run'
        from E:/railsdoc/mybook/config/environment.rb:9
        from e:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from e:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from e:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in `require'
        from e:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:521:in `new_constants_in'
        from e:/Ruby/lib/ruby/gems/1.8/gems/activesupport-2.3.5/lib/active_support/dependencies.rb:156:in `require'
        from e:/Ruby/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/commands/server.rb:84
        from e:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
        from e:/Ruby/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
        from script/server:3

E:\railsdoc\mybook>

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solultion:

Searched a bit over the net, and was sure that there is some problem with my database.yml file.

Couldn't find anything concrete, as I checked to make sure that there is no "tab" space used in the file.

The culprit was the indentation.

In the figure, can you see the difference? In the first case, the arguments after the"development" are properly indented (one space). In the second case, since there is no such indentation, the interpreter attempts to consider "adapter" (and the rests) at the same level as the "development". Try to avoid that.

Hopefully it will save other's efforts.

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development:
  adapter: mysql
  database: mybook
  host: localhost
  username: root
  password: 1234
 
test:
  adapter: mysql
  database: mybook
  host: localhost
  username: root
  password: 1234

production:
  adapter: mysql
  database: mybook
  host: localhost
  username: root
  password: 1234