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class TimeTableCombination
include ActiveModel::Validations
include ActiveModel::Conversion
extend ActiveModel::Naming
attr_accessor :source_id, :combined_type, :operation, :time_table_id, :calendar_id
validates_presence_of :source_id, :combined_type, :operation
validates :time_table_id, presence: true, if: "calendar_id.blank?"
validates :calendar_id, presence: true, if: "time_table_id.blank?"
validates_inclusion_of :combined_type, :in => %w(time_table calendar)
validates_inclusion_of :operation, :in => %w(union intersection disjunction), :allow_nil => true
def clean
self.source_id = nil
self.time_table_id = nil
self.calendar_id = nil
self.combined_type = nil
self.operation = nil
self.errors.clear
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 target
id = self.send("#{combined_type}_id")
klass = combined_type == "calendar" ? Calendar : Chouette::TimeTable
target = klass.find id
target = target.convert_to_time_table unless target.is_a? Chouette::TimeTable
target
end
def combine
source = Chouette::TimeTable.find source_id
combined = self.target
case operation
when 'union'
source.merge! combined
when 'intersection'
source.intersect! combined
when 'disjunction'
source.disjoin! combined
else
raise "unknown operation"
end
source
end
end
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