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module ActiveRelation
class Selection < Compound
attr_reader :predicate
def initialize(relation, *predicates)
predicate = predicates.shift
@relation = predicates.empty?? relation : Selection.new(relation, *predicates)
@predicate = predicate.bind(@relation)
end
def ==(other)
self.class == other.class and
relation == other.relation and
predicate == other.predicate
end
def descend(&block)
Selection.new(relation.descend(&block), yield(predicate))
end
def selects
relation.selects + [predicate]
end
end
end
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