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class Join
attr_reader :relation1, :relation2, :predicates, :join_type
def initialize(relation1, relation2, predicates, join_type)
@relation1, @relation2, @predicates, @join_type = relation1, relation2, predicates, join_type
end
def to_sql(builder = JoinsBuilder.new)
builder.call do
send(join_type, relation2.table) do
predicates.each { |p| p.to_sql(self) }
end
end
end
end
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