Hi,
I am creating my databases and models and I need to use some
relationships. I am very new at this so any help or info at all would be
great. :)
The concept is:
There are three resources: people, items and tags.
* An item belongs to one person, the creator.
* A person can create many items.
* An item can have many tags.
* A tag can be used on many items.
Here my models:
-----------------------------------
/* models/item.rb */
class Item < ActiveRecord::Base
belongs_to :person
has_many :tags
end
-----------------------------------
/* models/person.rb */
class Person < ActiveRecord::Base
has_many :items
end
-----------------------------------
/* models/tag.rb */
class Tag < ActiveRecord::Base
/* should I use 'has_and_belongs_to_many' here? */
end
Here's the migrations:
-----------------------------------
/* db/migrate/1_create_items.rb */
class CreateItems < ActiveRecord::Migration
def self.up
create_table :items do |t|
t.string :name
t.belongs_to :person
/* what should I put here to create a relation to tags? */
end
end
def self.down
drop_table :items
end
end
-----------------------------------
/* db/migrate/2_create_people.rb */
class CreatePeople < ActiveRecord::Migration
def self.up
create_table :people do |t|
t.string :name
/* do I need something here to create a relation to items? */
end
end
def self.down
drop_table :people
end
end
-----------------------------------
/* db/migrate/3_create_tags.rb */
class CreateTags < ActiveRecord::Migration
def self.up
create_table :tags do |t|
t.string :name
/* what should I put here to create a relation to items? */
end
end
def self.down
drop_table :tags
end
end
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