Ruby - reading CSV from STDIN - ruby

Question

I'm trying to read from .CSV file and create objects with attributes of every row.
My code works fine:
def self.load_csv
puts "Name of a file?"
filename = STDIN.gets.chomp
rows = []
text = File.read(filename).gsub(/\\"/,'""')
CSV.parse(text, headers: true, header_converters: :symbol) do |row|
row = row.to_h
row = row.each_with_object({}){|(k,v), h| h[k.to_sym] = v}
rows << row
end
rows.map do |row|
Call.new(row)
end
end
end
Now I wanted to take filename from STDIN. I simply changed:
def self.load_csv(filename)
rows = []
text = File.read(filename).gsub(/\\"/,'""')
CSV.parse(text, headers: true, header_converters: :symbol) do |row|
row = row.to_h
row = row.each_with_object({}){|(k,v), h| h[k.to_sym] = v}
rows << row
end
rows.map do |row|
Call.new(row)
end
end
end
and when I try ruby program.rb filename.csv I got error no implicit conversion of String into IO, and after removing line with File.read it does nothing - like an infinite loop maybe? Of course I invoke ceratain methods with STDIN argument in different parts of the code. I used similiar code for reading from STDIN with success in the past, what am I doing wrong this time?

Answer 1

This code is working:
require 'csv'
class Call
def initialize(args)
end
end
def load_csv(filename)
rows = []
text = File.read(filename).gsub(/\\"/,'""')
CSV.parse(text, headers: true, header_converters: :symbol) do |row|
row = row.to_h
row = row.each_with_object({}){ |(k,v), h| h[k.to_sym] = v }
rows << row
end
rows.map { |row| Call.new(row) }
end
filename = ARGV[0]
load_csv(filename)