The document appears to be notes from a Ruby on Rails modeling workshop. It includes instructions for generating models for a Wiki application, with User, Page, Comment, and History models. It also includes model validations, tests, associations and notes on Active Record features like migrations, validations, callbacks, associations, and querying.

1. Model
Hamamatsurb#5 2011.07.13 @mackato
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3. Wiki
5
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8. Model
- Ruby on Rails Guides
Rails Database Migrations: http://bit.ly/rrH5zQ
Active Record Validations and Callbacks: http://bit.ly/qp5vkm
Active Record Associations: http://bit.ly/n3exu9
Active Record Query Interface: http://bit.ly/qaeazJ
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9. Version 1.9.2
Version 3.0.7
.rvmrc
rvm ruby-1.9.2-p180@rails-3_0_7
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10. GitHub
git clone git://github.com/hamamatsu-rb/rails3dojo.git
git checkout -b working 2-model_pre
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11. FactoryGirl( ) Spork( )
Gemfile
.rspec
Spork
spork --bootstrap
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12. Wiki
User: Wiki
Page: Wiki
Comment: Page
History: Page
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13. Wiki
rails g model user name:string
rake db:migrate
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14. spec/factories.rb
spec/spec_helper.rb
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15. spec/models/user_spec.rb
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16. app/models/user.rb
SexyValidation!
Legacy Style Validation
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17. bundle exec rspec spec/models/user_spec.rb
User
#name
50
#find_or_create_by_name
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18. Wiki
rails g model page title:string body:text
user_id:integer
rake db:migrate
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19. spec/factories.rb
spec/spec_helper.rb
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20. spec/models/page_spec.rb( )
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21. app/models/page.rb
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22. Page
rails g model comment body:text
page_id:integer user_id:integer
rake db:migrate
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23. spec/factories.rb
spec/spec_helper.rb
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24. spec/models/comment_spec.rb( )
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25. app/models/comment.rb
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26. spec/models/page_spec.rb ( )
app/models/page.rb
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27. Page
rails g model history
page_id:integer user_id:integer
rake db:migrate
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28. spec/factories.rb
spec/spec_helper.rb
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29. spec/models/history_spec.rb
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30. app/models/history.rb
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31. spec/models/page_spec.rb ( )
app/models/page.rb
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32. spec/models/page_spec.rb ( )
app/models/page.rb
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33. master
git checkout master
git merge working
git branch -d working
GitHub
git clone git://github.com/hamamatsu-rb/rails3dojo.git
git checkout 2-model
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35. page
db/migrate/20110712154821_create_pages.rb
rake db:migrate [VERSION=YY..]
rake db:rollback [STEP=N]
rake db:migrate:redo [STEP=N]
page
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36. Validation Helpers vs SexyValidation
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37. The belongs_to Association The has_many :through Association
class Order < ActiveRecord::Base
belongs_to :customer class Physician < ActiveRecord::Base
end has_many :appointments
has_many :patients, :through => :appointments
end
The has_one Association
class Appointment < ActiveRecord::Base
class Supplier < ActiveRecord::Base belongs_to :physician
has_one :account belongs_to :patient
end end
class Patient < ActiveRecord::Base
has_many :appointments
The has_many Association has_many :physicians, :through => :appointments
end
class Customer < ActiveRecord::Base
has_many :orders
end
: Active Record Associations: http://bit.ly/n3exu9
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38. Finder methods Retrieving a Single Object
• where
• select
• group
• order Retrieving Multiple Objects
• limit
• offset
• joins
• includes
• lock Calculations
• readonly
• from
• having
Active Record Query Interface: http://bit.ly/qaeazJ
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