Hi All,
Here's my situation. People have Availability for Events. I need to ensure that
each Person is Available for each Event exactly once.
I'm thinking the way to do it would be with a before_save method in
Availability that does an
Availability.find("event_id = ? and person_id = ?", record.event_id,
record.person_id)
and complains if it finds one.
Is this the way to go or is there a better approach?
**Leigh
=============
#Person.rb
class Person < ActiveRecord::Base
has_many :availabilities
has_many :events, :through => :availabilities
default_scope :order => 'name ASC'
validates_presence_of :name, :on => :create, :message => "-- You need to
enter your name"
end
#Availability.rb
class Availability < ActiveRecord::Base
belongs_to :event
belongs_to :person
validates_presence_of :person_id, :on => :create, :message => "can't be blank"
validates_presence_of :event_id, :on => :create, :message => "can't be blank"
end
#Event.rb
class Event < ActiveRecord::Base
has_many :availabilities
has_many :people, :through => :availabilities
default_scope :order => 'date ASC'
validates_presence_of :name, :on => :create, :message => "can't be blank"
validates_presence_of :date, :on => :create, :message => "can't be blank"
end
# Schema.rb
ActiveRecord::Schema.define(:version => 20110809224443) do
create_table "availabilities", :force => true do |t|
t.integer "event_id"
t.integer "person_id"
. . .
end
create_table "events", :force => true do |t|
t.string "name"
t.datetime "date"
. . .
end
create_table "people", :force => true do |t|
t.string "name"
. . .
end
end
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