module Hobo

  class WhereFragment

    def initialize(sql, *params)
      @sql = params.empty? ? sql : ActiveRecord::Base.send(:sanitize_sql, [sql] + params)
    end

    def &(rhs)
      # If either is nil, just return the other
      if self.to_sql && rhs.to_sql
        WhereFragment.new("(#{to_sql}) and (#{rhs.to_sql})")
      else
        self.to_sql || rhs.to_sql
      end
    end

    def |(rhs)
      WhereFragment.new("(#{to_sql}) or (#{rhs.to_sql})")
    end

    def to_sql
      @sql
    end

  end

end