Rails app won't start

[sewid]

Hi,

I think it's not a specific mongoid / mongodb problem, but maybe somebody can help me. I've just reinstalled my rails environment (rvm, ruby, gems, ...) and if I want to start my rails app or the rails console, I get this message:

Sebastian-Widmanns-MacBook-Pro:config sebastian$ rails c
/Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongo-1.2.0/lib/mongo/util/support.rb:50:in `validate_db_name': db_name must be a string or symbol (TypeError)
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongo-1.2.0/lib/mongo/db.rb:80:in `initialize'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongo-1.2.0/lib/mongo/connection.rb:272:in `new'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongo-1.2.0/lib/mongo/connection.rb:272:in `db'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongoid-2.0.0.rc.7/lib/mongoid/config/database.rb:19:in `configure'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongoid-2.0.0.rc.7/lib/mongoid/config.rb:322:in `configure_databases'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongoid-2.0.0.rc.7/lib/mongoid/config.rb:110:in `from_hash'
    from (eval):2:in `from_hash'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongoid-2.0.0.rc.7/lib/mongoid/railtie.rb:66:in `block in <class:Railtie>'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/initializable.rb:25:in `instance_exec'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/initializable.rb:25:in `run'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/initializable.rb:50:in `block in run_initializers'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/initializable.rb:49:in `each'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/initializable.rb:49:in `run_initializers'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/application.rb:134:in `initialize!'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/application.rb:77:in `method_missing'
    from /Users/sebastian/Sites/rails/event-click/config/environment.rb:5:in `<top (required)>'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.4.rc1/lib/active_support/dependencies.rb:239:in `require'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.4.rc1/lib/active_support/dependencies.rb:239:in `block in require'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.4.rc1/lib/active_support/dependencies.rb:225:in `block in load_dependency'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.4.rc1/lib/active_support/dependencies.rb:596:in `new_constants_in'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.4.rc1/lib/active_support/dependencies.rb:225:in `load_dependency'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/activesupport-3.0.4.rc1/lib/active_support/dependencies.rb:239:in `require'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/application.rb:103:in `require_environment!'
    from /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/railties-3.0.4.rc1/lib/rails/commands.rb:22:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

Any idea, why?
I use Ruby 1.9.2 and normally Rails 3.0.3, now I tried it with 3.0.4.rc1 - same problem.

Regards,
sewid

[Visnu Pitiyanuvath]

what does your config/mongoid.yml look like?

[sewid]

Hi visnup,

here is my mongoid.yml: https://gist.github.com/811464

There is no trailing space or tab in it. And If I check out my sourcecode from yesterday, the same problem occurs.

When I modify my mongoid.yml to look like:

----------

defaults: &defaults
  host: localhost
  allow_dynamic_fields: false
  autocreate_indexes: false
  raise_not_found_error: true
----------

and remove the rest, rails is starting?!?

Regards,
sewid

[Visnu Pitiyanuvath]

instead of name: sample_app_development it should be database: sample_app_development

[sewid]

It was database before, i also tried db_name, name, ... - none of those is working (I just re-tried database: ... without success).

I am really confused.

Regards,
sewid

[Visnu Pitiyanuvath]

can you add a breakpoint at /Users/sebastian/.rvm/gems/ruby-1.9.2-p136/gems/mongo-1.2.0/lib/mongo/util/support.rb:50:in `validate_db_name': db_name must be a string or symbol (TypeError)

and see what db_name is at that point?

[sewid]

When trying to debug, I get https://gist.github.com/811516

Today is not my day :-(

[Visnu Pitiyanuvath]

how about if you just throw a good 'ole `puts db_name` into that code?

[sewid]

Ok, I added the puts like this: 

https://gist.github.com/811535

The result is:

https://gist.github.com/811536

I have no idea, where this 'admin' is coming from and why there is an empty line. Any ideas?

Regards,

sewid

[sewid]

When I uncomment the

  <<: *defaults

in mongoid.yml, it is working. I'm going to copy the default values to prod, test and dev, so I can continue to work. I have no idea, why this is, but this is a working workaround.

@visnup: Thanks a lot for your help, if you have another idea, please let me know.

Regards
sewid
 

[sewid]

After hours of pain in my head, I found the solution:

http://redmine.ruby-lang.org/issues/show/4300

I reinstalled my ruby environment and that was the reason, why rubygems was updated to 1.5.0. Rubygems 1.5.0 changes the yaml parsing default from syck to psych and psych doesn't like the ":<<" in yaml files.

Add this to the beginning of your config/environment.rb, if you have libyaml installed (default with rvm ruby 1.9.2):
require 'yaml'
YAML::ENGINE.yamler= 'syck'

Now, everything works fine.

Regards,
sewid

[iEmpire]

You've saved my day! Thanks a lot!

[Nik]

saved mine, too. Ran into the same problem.

[m-b]

Saved my day also :)