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module Arel
class TreeManager
include Arel::FactoryMethods
attr_reader :ast, :engine
def initialize engine
@engine = engine
@ctx = nil
end
def to_dot
Visitors::Dot.new.accept @ast
end
def visitor
engine.connection.visitor
end
def to_sql
visitor.accept @ast
end
def initialize_copy other
super
@ast = @ast.clone
end
def where expr
if Arel::TreeManager === expr
expr = expr.ast
end
@ctx.wheres << expr
self
end
end
end
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