Eu sempre esqueço disso, para listar todas as tasks disponíveis em um projeto Rails digite:
rake -TResultado:
rake db:abort_if_pending_migrations # Raises an error if there are pending migrations rake db:charset # Retrieves the charset for the current environment's database rake db:collation # Retrieves the collation for the current environment's database rake db:create # Create the database defined in config/database.yml for the current RAILS_ENV rake db:create:all # Create all the local databases defined in config/database.yml rake db:drop # Drops the database for the current RAILS_ENV rake db:drop:all # Drops all the local databases defined in config/database.yml rake db:fixtures:identify # Search for a fixture given a LABEL or ID. rake db:fixtures:load # Load fixtures into the current environment's database. rake db:migrate # Migrate the database through scripts in db/migrate and update db/schema.rb by invoking db:schema:dump. Target specific version with VERSION=x. Turn off output with VERBOSE=false. rake db:migrate:down # Runs the "down" for a given migration VERSION. rake db:migrate:redo # Rollbacks the database one migration and re migrate up. rake db:migrate:reset # Resets your database using your migrations for the current environment rake db:migrate:up # Runs the "up" for a given migration VERSION. rake db:reset # Drops and recreates the database from db/schema.rb for the current environment. rake db:rollback # Rolls the schema back to the previous version. rake db:schema:dump # Create a db/schema.rb file that can be portably used against any DB supported by AR rake db:schema:load # Load a schema.rb file into the database rake db:sessions:clear # Clear the sessions table rake db:sessions:create # Creates a sessions migration for use with ActiveRecord::SessionStore rake db:structure:dump # Dump the database structure to a SQL file rake db:test:clone # Recreate the test database from the current environment's database schema rake db:test:clone_structure # Recreate the test databases from the development structure rake db:test:load # Recreate the test database from the current schema.rb rake db:test:prepare # Check for pending migrations and load the test schema rake db:test:purge # Empty the test database rake db:version # Retrieves the current schema version number rake doc:app # Build the RDOC HTML Files rake doc:clobber_app # Remove rdoc products rake doc:clobber_plugins # Remove plugin documentation rake doc:clobber_rails # Remove rdoc products rake doc:guides # Generate Rails guides rake doc:plugins # Generate documentation for all installed plugins rake doc:plugins:activerecord_i18n_defaults # Generate documentation for the activerecord_i18n_defaults plugin rake doc:plugins:i18n_label # Generate documentation for the i18n_label plugin rake doc:plugins:jrails # Generate documentation for the jrails plugin rake doc:plugins:paperclip # Generate documentation for the paperclip plugin rake doc:plugins:rubyamf # Generate documentation for the rubyamf plugin rake doc:rails # Build the RDOC HTML Files rake doc:reapp # Force a rebuild of the RDOC files rake doc:rerails # Force a rebuild of the RDOC files rake gems # List the gems that this rails application depends on rake gems:build # Build any native extensions for unpacked gems rake gems:build:force # Force the build of all gems rake gems:install # Installs all required gems. rake gems:refresh_specs # Regenerate gem specifications in correct format. rake gems:unpack # Unpacks all required gems into vendor/gems. rake gems:unpack:dependencies # Unpacks all required gems and their dependencies into vendor/gems. rake jrails:install:javascripts # Installs the jQuery and jRails javascripts to public/javascripts rake jrails:update:javascripts # Copies the jQuery and jRails javascripts to public/javascripts rake log:clear # Truncates all *.log files in log/ to zero bytes rake middleware # Prints out your Rack middleware stack rake notes # Enumerate all annotations rake notes:custom # Enumerate a custom annotation, specify with ANNOTATION=WTFHAX rake notes:fixme # Enumerate all FIXME annotations rake notes:optimize # Enumerate all OPTIMIZE annotations rake notes:todo # Enumerate all TODO annotations rake paperclip:clean # Cleans out invalid attachments. rake paperclip:refresh # Refreshes both metadata and thumbnails. rake paperclip:refresh:metadata # Regenerates content_type/size metadata for a given CLASS (and optional ATTACHMENT). rake paperclip:refresh:thumbnails # Regenerates thumbnails for a given CLASS (and optional ATTACHMENT). rake rails:freeze:edge # Lock to latest Edge Rails, for a specific release use RELEASE=1.2.0 rake rails:freeze:gems # Lock this application to the current gems (by unpacking them into vendor/rails) rake rails:template # Applies the template supplied by LOCATION=/path/to/template rake rails:unfreeze # Unlock this application from freeze of gems or edge and return to a fluid use of system gems rake rails:update # Update both configs, scripts and public/javascripts from Rails rake rails:update:application_controller # Rename application.rb to application_controller.rb rake rails:update:configs # Update config/boot.rb from your current rails install rake rails:update:generate_dispatchers # Generate dispatcher files in RAILS_ROOT/public rake rails:update:javascripts # Update your javascripts from your current rails install rake rails:update:scripts # Add new scripts to the application script/ directory rake routes # Print out all defined routes in match order, with names. rake secret # Generate a crytographically secure secret key. rake stats # Report code statistics (KLOCs, etc) from the application rake test # Run all unit, functional and integration tests rake test:benchmark # Run tests for benchmarkdb:test:prepare / Benchmark the performance tests rake test:functionals # Run tests for functionalsdb:test:prepare / Run the functional tests in test/functional rake test:integration # Run tests for integrationdb:test:prepare / Run the integration tests in test/integration rake test:plugins # Run tests for pluginsenvironment / Run the plugin tests in vendor/plugins/*/**/test (or specify with PLUGIN=name) rake test:profile # Run tests for profiledb:test:prepare / Profile the performance tests rake test:recent # Run tests for recentdb:test:prepare / Test recent changes rake test:uncommitted # Run tests for uncommitteddb:test:prepare / Test changes since last checkin (only Subversion and Git) rake test:units # Run tests for unitsdb:test:prepare / Run the unit tests in test/unit rake time:zones:all # Displays names of all time zones recognized by the Rails TimeZone class, grouped by offset. rake time:zones:local # Displays names of time zones recognized by the Rails TimeZone class with the same offset as the system local time rake time:zones:us # Displays names of US time zones recognized by the Rails TimeZone class, grouped by offset. rake tmp:cache:clear # Clears all files and directories in tmp/cache rake tmp:clear # Clear session, cache, and socket files from tmp/ rake tmp:create # Creates tmp directories for sessions, cache, sockets, and pids rake tmp:pids:clear # Clears all files in tmp/pids rake tmp:sessions:clear # Clears all files in tmp/sessions rake tmp:sockets:clear # Clears all files in tmp/sockets
Se você gostou desse texto e acha que ajudou você, me recomende: 
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