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tree)
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module Arel
class TreeManager
# FIXME: Remove this.
include Arel::Relation
VISITORS = {
'postgresql' => Arel::Visitors::PostgreSQL
}
def initialize engine
@engine = engine
@pool = engine.connection_pool
@adapter = @pool.spec.config[:adapter]
@visitor_klass = VISITORS[@adapter] || Visitors::ToSql
end
def to_dot
Visitors::Dot.new.accept @head
end
def to_sql
viz = @visitor_klass.new @engine
viz.accept @head
end
def initialize_copy other
super
@head = @head.clone
end
end
end
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