Question

I’m working on a file related task..I have a CSV file with some rows and headers..I need to fetch column with particular header and create a new column at the end and do some operations..how can i fetch column values which is having particular header value and how can i create new column in the end?

Answer 1

Assuming you have CSV in following format

Zipcode Network ID Network Name Zone New Network? Display Name
64024 275 Kansas City 2 No Kansas City
64034 275 Kansas City 2 No Kansas City

You can user FasterCSV;
If you have headers in your csv then you can specify it headers => true what you can do is to fetch data from row by row using FasterCSV,as given below

FasterCSV.foreach(path_to_file, { :headers => true, :row_sep => :auto }) do |row|

Each time you iterate the csv you would get row from your CSV file, now you already know that column 2 has “network_id” header and column 3 has “network name” header so you can easily give network_id = row[2], network_name = row[3]

hope it would answer your question