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class TimeTableCombination
include ActiveModel::Validations
include ActiveModel::Conversion
extend ActiveModel::Naming
attr_accessor :source_id, :combined_id, :combined_name, :operation
validates_presence_of :source_id, :combined_id, :operation, :combined_name
validates_inclusion_of :operation, :in => %w( union intersection disjunction)
def clean
self.source_id = nil
self.combined_id = nil
self.combined_name = nil
self.operation = nil
self.errors.clear
end
def valid?(context = nil)
self.combined_name = nil if self.combined_id.blank?
super context
end
def invalid?(context = nil)
self.combined_name = nil if self.combined_id.blank?
super context
end
def self.operations
%w( union intersection disjunction)
end
def initialize(attributes = {})
attributes.each do |name, value|
send("#{name}=", value)
end
end
def persisted?
false
end
def combine
source = Chouette::TimeTable.find( source_id)
combined = Chouette::TimeTable.find( combined_id)
if operation == "union"
source.merge! combined
elsif operation == "intersection"
source.intersect! combined
elsif operation == "disjunction"
source.disjoin! combined
else
raise "unknown operation"
end
source
end
end
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