Rails and Rake

Here's a list of helpful rake commands for rails:

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rake db:fixtures:load - Load fixtures into the current environment's database. Load specific fixtures using FIXTURES=x,y
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rake db:migrate - Migrate the database through scripts in db/migrate. Target specific version with VERSION=x
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rake db:schema:dump - Create a db/schema.rb file that can be portably used against any DB supported by AR.
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rake db:schema:load - Load a schema.rb file into the database.
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rake db:sessions:clear - Clear the sessions table.
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rake db:sessions:create - Creates a sessions table for use with CGI::Session::ActiveRecordStore.
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rake db:structure:dump - Dump the database structure to a SQL file.
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rake db:test:clone - Recreate the test database from the current environment's database schema.
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rake db:test:clone_structure - Recreate the test databases from the development structure.
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rake db:test:prepare - Prepare the test database and load the schema.
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rake db:test:purge - Empty the test database.
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rake doc:appBuild the app HTML Files.
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rake doc:clobber_app - Remove rdoc products.
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rake doc:clobber_plugins - Remove plugin documentation.
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rake doc:clobber_rails Remove rdoc products.
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rake doc:plugins - Generate documation for all installed plugins.
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rake doc:rails - Build the rails HTML Files.
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rake doc:reapp - Force a rebuild of the RDOC files
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rake doc:rerails - Force a rebuild of the RDOC files
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rake log:clear - Truncates all *.log files in log/ to zero bytes
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rake rails:freeze:edge - Lock this application to latest Edge Rails. Lock a specific revision with REVISION=X.
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rake rails:freeze:gems - Lock this application to the current gems (by unpacking them into vendor/rails)
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rake rails:unfreeze - Unlock this application from freeze of gems or edge and return to a fluid use of system gems
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rake rails:update - Update both scripts and public/javascripts from Rails.
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rake rails:update:javascripts - Update your javascripts from your current rails install.
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rake rails:update:scripts - Add new scripts to the application script/ directory.
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rake stats - Report code statistics (KLOCs, etc) from the application.
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rake test - Test all units and functionals
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rake test:functionals - Run tests for functionalsdb:test:prepare
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rake test:integration - Run tests for integrationdb:test:prepare
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rake test:plugins - Run tests for pluginsenvironment
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rake test:recent - Run tests for recentdb:test:prepare
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rake test:uncommitted - Run tests for uncommitteddb:test:prepare
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rake test:units - Run tests for unitsdb:test:prepare
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rake tmp:cache:clear - Clears all files and directories in tmp/cache
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rake tmp:clear - Clear session, cache, and socket files from tmp/
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rake tmp:create - Creates tmp directories for sessions, cache, and sockets
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rake tmp:sessions:clear - Clears all files in tmp/sessions
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rake tmp:sockets:clear - Clears all ruby_sess.* files in tmp/sessions




Original Source:

http://www.tutorialspoint.com/ruby-on-rails/rails-and-rake.htm

ActiveRecord: Can't Retrieve value of Id after insert

Although there could be many problems (for example the record isn't actually saving), another problem I ran into is that you need to be using naming conventions. I was using 'Id' for my primary field name. That didn't work. Tried it with 'id' and everything began working well again.

Problem subtracting dates minus_without_duration

If you try subtracting dates that are really large (like in the year 2499) you will get the error minus_without_duration. make the dates more reasonable and everything works just fine.

Rails Reserved Words

if you use words from this list as your column names you will get all kinds of grief and heartache. Be careful:

The only list I've found that had all the words I've run into problems with is here:

http://www.yup.com/articles/2007/01/31/no-reservations-about-keywords-in-ruby-on-rails

Custom sql query with Activerecord

LabourEntry.all(:conditions => [sql])

Migrations

Docs for adding and removing columns

http://api.rubyonrails.org/classes/ActiveRecord/Migration.html

Uninitialized Constant error on Controller

If for whatever reason you have screwed up your controller names by having singular where you should have plural or whatever, you can correct this problem through your routes file. here's a quote that helped me fix a problem with restful_authentication plugin.



for those people that used a singular Session and get the "uninitialized constant SessionsController"

So instead of
map.resource :session
use rather
map.resource :session, :controller => 'session'