# Rake doesn't know how to build 'db\_schema\_dump'

**URL:** <https://www.ruby-forum.com/t/rake-doesnt-know-how-to-build-db-schema-dump/135696>\
**Category:** Rails\
**Created:** [April 24, 2008, 10:08am UTC](https://www.ruby-forum.com/t/rake-doesnt-know-how-to-build-db-schema-dump/135696 "2008-04-24T10:08:09Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![codemonkey](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/9fc348/32.png) [@codemonkey](https://www.ruby-forum.com/u/codemonkey)\
**Post date:** [April 24, 2008, 10:08am UTC](https://www.ruby-forum.com/t/rake-doesnt-know-how-to-build-db-schema-dump/135696/1 "2008-04-24T10:08:09Z")

</div>

Alright, I’m a complete newbie at rails. I have over 4 years experience  
and php and figured I would try my hand at rails. So I’m following the  
‘Migration tutorial’ from the RoR homepage. I’m trying to build a  
Sqlite3 database using the Sqlite3 gem.

Database.yml:

development:  
adapter: sqlite3  
database: db/development.sqlite3  
timeout: 5000

test:  
adapter: sqlite3  
database: db/test.sqlite3  
timeout: 5000

production:  
development

Outputs

C:\ruby\blog\db\>rake db\_schema\_dump  
(in C:/ruby/blog)  
rake aborted!  
Don’t know how to build task ‘db\_schema\_dump’

(See full trace by running task with --trace)

C:\ruby\blog\db\>rake db\_schema\_dump --trace  
(in C:/ruby/blog)  
rake aborted!  
Don’t know how to build task ‘db\_schema\_dump’  
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1472:in `[]' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in`top\_level’  
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in `each' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1739:in`top\_level’  
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1761:in  
`standard_exceptio n_handling' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1733:in`top\_level’  
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1711:in `run' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1761:in`standard\_exceptio  
n\_handling’  
c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/lib/rake.rb:1708:in `run' c:/ruby/lib/ruby/gems/1.8/gems/rake-0.7.3/bin/rake:7 c:/ruby/bin/rake:16:in`load’  
c:/ruby/bin/rake:16

Any help is greatly appreciated.

---

<div class="post-metadata">

**Author:** ![codemonkey](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/c/9fc348/32.png) [@codemonkey](https://www.ruby-forum.com/u/codemonkey)\
**Post date:** [April 24, 2008, 11:24am UTC](https://www.ruby-forum.com/t/rake-doesnt-know-how-to-build-db-schema-dump/135696/2 "2008-04-24T11:24:55Z")

</div>

> C:\ruby\blog\db\>rake db\_schema\_dump  
> (in C:/ruby/blog)  
> rake aborted!  
> Don’t know how to build task ‘db\_schema\_dump’

Rake tasks can now have namespaces and rails uses them. It looks like  
the tutorial assumes a prior version of rails before rake namespaces  
existed. You probably need:

rake db:schema:dump

You can get a full list of rake tasks available, but running:

rake -T

Hope that helps,  
Jordan