Rails !

hmm ... someone pointed out that I ripped this from a site or the help file or something. Well, I did not say I wrote it right? Anyway, the list below is available elsewhere, but I put it here for the benefit of any Rails developer wannabe who happens to stumble onto my blog....

Some useful rake and rails commands:

rake migrate version=0

rake test:units

rake test:functionals

rake annotate_models

rake db:sessions:clear

rake doc:app

rake log:clear

rake db:test:prepare -> prepares test database with development database schema

rake -T #displays all rake tasks with description

Generators:

ruby script/generate model ModellName

ruby script/generate controller ListController show edit

ruby script/generate scaffold ModelName ControllerName

ruby script/generate migration AddNewTable

ruby script/generate plugin PluginName

ruby script/generate mailer Notification lost_password signup

ruby script/generate web_service ServiceName api_one api_two

ruby script/generate integration_test TestName

ruby script/generate session_migration

Find:

find(42) # object with ID 42

find([37, 42]) # Array with the objects with id 37, 42

find :all

find :first,

:conditions => [ "name = ?", "Hans" ] # finds the first record with

# the matching condition

more parameters for find:

:order => ‘name DESC’ # sql fragment for sorting

:offset => 20 # starts with entry 20

:limit => 10 # only return 10 objects

:group => ‘name’ # sql fragment GROUP BY

:joins => ‘LEFT JOIN …’ # additional LEFT JOIN (rarely used)

:include => [:account, :friends] # LEFT OUTER JOIN with these model

:include => { :groups => { :members=> { :favorites } } }

:select => [:name, :adress] # instead of SELECT * FROM

:readonly => true # objects are write protected

Migration:

rake db:migrate

rake db:migrate VERSION=14

rake db:migrate RAILS_ENV=production

Calculations:

Person.average :age

Person.minimum :age

Person.maximum :age

Person.sum :salary, :group => :last_name