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module Arel
module Nodes
class Extract < Arel::Nodes::Unary
include Arel::Expression
include Arel::Predications
attr_accessor :field
attr_accessor :alias
def initialize expr, field, aliaz = nil
super(expr)
@field = field
@alias = aliaz && SqlLiteral.new(aliaz)
end
def as aliaz
self.alias = SqlLiteral.new(aliaz)
self
end
def hash
super ^ [@field, @alias].hash
end
def eql? other
super &&
self.field == other.field &&
self.alias == other.alias
end
alias :== :eql?
end
end
end
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