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module Arel
class Row
attr_reader :tuple, :relation
def initialize relation, tuple
@relation = relation
@tuple = tuple
end
def == other
super ||
Row === other &&
relation == other.relation &&
tuple == other.tuple
end
def [](attribute)
attribute.type_cast(tuple[relation.position_of(attribute)])
end
def slice(*attributes)
Row.new(relation, attributes.inject([]) do |cheese, attribute|
# FIXME TESTME method chaining
cheese << tuple[relation.relation.position_of(attribute)]
cheese
end)
end
def bind(relation)
Row.new(relation, tuple)
end
def combine(other, relation)
Row.new(relation, tuple + other.tuple)
end
end
end
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