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module Arel
class Where < Compound
attr_reader :predicates
def initialize(relation, *predicates)
super(relation)
predicates = [yield(relation)] + predicates if block_given?
@predicates = predicates.map { |p| p.bind(relation) }
@wheres = nil
end
def wheres
@wheres ||= relation.wheres + predicates
end
def == other
super ||
Where === other &&
relation == other.relation &&
predicates == other.predicates
end
def engine
engine = relation.engine
# Temporary check of whether or not the engine supports where.
if engine.respond_to?(:supports) && !engine.supports(:restricting)
Memory::Engine.new
else
engine
end
end
def eval
unoperated_rows.select { |row| predicates.all? { |p| p.eval(row) } }
end
end
end
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