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Instance methods for ActiveRecord to fetch the "neighbor" records
module NeighborRecords
def previous_one(col_name = :id)
condition = self.class.arel_table[col_name].lt(public_send(col_name))
self.class.where(condition).order(col_name => :desc).first
end
def next_one(col_name = :id)
condition = self.class.arel_table[col_name].gt(public_send(col_name))
self.class.where(condition).order(col_name => :asc).first
end
end
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