def calculate_audit_for(param)
      #Gets all flattened attribute lists
      #objects are a hash of
      #{attributes: object attributes, whodunnit: paper_trail whodunnit which caused the object to be in this state}
      objects = [{attributes: self.attributes, whodunnit: self.paper_trail.originator},
        self.versions.map {|e| {attributes: YAML.load(e.object), whodunnit: e.paper_trail_originator} if e.object}.compact].flatten
      #rejecting objects with no update time, orders by the updated at times in ascending order
      objects = objects.select {|e| e[:attributes]["updated_at"]}.sort_by {|e| e[:attributes]["updated_at"]}
      result = []
      #Add the initial state if the first element has a value
      if(objects.count > 0 && !objects.first[:attributes][param.to_s].nil?)
        result <<  PaperTrailAudit::Change.new({old_value: nil,
            new_value: objects.first[:attributes][param.to_s],
            time: objects.first[:attributes]["updated_at"],
            whodunnit: objects.first[:whodunnit]
            })
      end
      objects.each_cons(2) do |a,b|
        if a[:attributes][param.to_s] != b[:attributes][param.to_s]
          result << PaperTrailAudit::Change.new({old_value: a[:attributes][param.to_s],
            new_value: b[:attributes][param.to_s],
            time: b[:attributes]["updated_at"],
            whodunnit: b[:whodunnit]
          })
        end
      end
      result
    end
def calculate_audit_for(param)
      
      
      
      objects = [{attributes: self.attributes, whodunnit: self.paper_trail.originator},
        self.versions.map {|e| {attributes: YAML.load(e.object), whodunnit: e.paper_trail_originator} if e.object}.compact].flatten
      
      objects = objects.select {|e| e[:attributes]["updated_at"]}.sort_by {|e| e[:attributes]["updated_at"]}
      result = []
      
      if(objects.count > 0 && !objects.first[:attributes][param.to_s].nil?)
        result <<  PaperTrailAudit::Change.new({old_value: nil,
            new_value: objects.first[:attributes][param.to_s],
            time: objects.first[:attributes]["updated_at"],
            whodunnit: objects.first[:whodunnit]
            })
      end
      objects.each_cons(2) do |a,b|
        if a[:attributes][param.to_s] != b[:attributes][param.to_s]
          result << PaperTrailAudit::Change.new({old_value: a[:attributes][param.to_s],
            new_value: b[:attributes][param.to_s],
            time: b[:attributes]["updated_at"],
            whodunnit: b[:whodunnit]
          })
        end
      end
      result
    end
def calculate_audit_for ( param ) #Gets all flattened attribute lists #objects are a hash of #{attributes: object attributes, whodunnit: paper_trail whodunnit which caused the object to be in this state} objects = [ { attributes : self . attributes , whodunnit : self . paper_trail . originator } , self . versions . map { | e | { attributes : YAML . load ( e . object ) , whodunnit : e . paper_trail_originator } if e . object } . compact ] . flatten #rejecting objects with no update time, orders by the updated at times in ascending order objects = objects . select { | e | e [ :attributes ] [ "updated_at" ] } . sort_by { | e | e [ :attributes ] [ "updated_at" ] } result = [ ] #Add the initial state if the first element has a value if ( objects . count > 0 && ! objects . first [ :attributes ] [ param . to_s ] . nil? ) result << PaperTrailAudit :: Change . new ( { old_value : nil , new_value : objects . first [ :attributes ] [ param . to_s ] , time : objects . first [ :attributes ] [ "updated_at" ] , whodunnit : objects . first [ :whodunnit ] } ) end objects . each_cons ( 2 ) do | a , b | if a [ :attributes ] [ param . to_s ] != b [ :attributes ] [ param . to_s ] result << PaperTrailAudit :: Change . new ( { old_value : a [ :attributes ] [ param . to_s ] , new_value : b [ :attributes ] [ param . to_s ] , time : b [ :attributes ] [ "updated_at" ] , whodunnit : b [ :whodunnit ] } ) end end result end
Returns the audit list for the specified column

 @param [symbol] param: symbol to query
 @return [array of Change objects]
Returns the audit list for the specified column