Short presentation takes you the basics of Rails Model Associations by constructing a simple app, Timber: the dating app for Lumberjacks and Lumberjills. Code can be found on github: https://github.com/PareidoliaX/timber

1. Timber App
Ruby Rails Associations
@PareidoliaX

2. Four Take Homes
1. Associations are not database relationships but
dependent on them.
2. There is always a belongs_to side of the association.
3. The table of the model of the belongs_to side of the
association holds the information about the
relationship.
4. belongs_to works in migrations and generators.

3. Timber Iteration 1
Requirements
4 Tracks Lumberjacks and Lumberjills
4 A Lumberjack or Lumberjill can choose on true love
4 A Lumberjack or Lumberjill's profile shows all their
admires

4. Todays Association:
belongs_to and
has_many

5. Based on the one to many
database relationship

6. LumberJack Migration
class CreateLumberjacks < ActiveRecord::Migration
def change
create_table :lumberjacks do |t|
t.string :name
t.belongs_to :lumberjill, index: true
t.timestamps
end
end
end

7. LumberJill Migration
class CreateLumberjills < ActiveRecord::Migration
def change
create_table :lumberjills do |t|
t.string :name
t.belongs_to :lumberjack, index: true
t.timestamps
end
end
end

8. LumberJill Model
class Lumberjill < ActiveRecord::Base
belongs_to :lumberjack
has_many :lumberjacks
end

9. LumberJack Model
class Lumberjack < ActiveRecord::Base
belongs_to :lumberjill
has_many :lumberjills
end

10. Limitations of this solution
+ Only one true love possible, can't handle complex relationships.

11. Four Take Homes
1. Associations are not database relationships but
dependent on them.
2. There is always a belongs_to side of the association.
3. The table of the model of the belongs_to side of the
association holds the information about the
relationship.
4. belongs_to works in migrations and generators.

12. Find Me
4 Twitter: @pareidoliax
4 Website: pareidoliax.ca
4 Github: pareidoliax
4 email: xander.miller@gmail.com