Question

This works but for some reason the comma is missing. data gets inserted as

GAURISH SHARMA
97
69
69
975
PASS

with each value written in new line. I wonder Where did the commas go? or do those have to manually inserted?

---

I am trying to write hash values using the following code

CSV.open("resultdata.csv", "a") do |csv|    
  h.each do |key, value|
    csv << value
  end
end

and here are the contents of the h hash

{:name=>"GAURISH SHARMA",
 :ca=>"97",
 :cb=>"69",
 :ba_lab=>"69",
 :bb_lab=>"69",
 :grand_total=>"975",
 :result=>"PASS"}

This code looks correct but upon running this code, generates the following errors:

/home/gaurish/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/csv.rb:1729:in `<<': undefined method `map' for "GAURISH SHARMA":String (NoMethodError)
    from /home/gaurish/Dropbox/code/projects/ra/result.rb:35:in `block (2 levels) in <main>'
    from /home/gaurish/Dropbox/code/projects/ra/result.rb:34:in `each'
    from /home/gaurish/Dropbox/code/projects/ra/result.rb:34:in `block in <main>'
    from /home/gaurish/.rvm/rubies/ruby-1.9.3-p194/lib/ruby/1.9.1/csv.rb:1354:in `open'
    from /home/gaurish/Dropbox/code/projects/ra/result.rb:33:in `<main>'

Any idea what is wrong here?

Answer 1

When you do csv << value, you are writing a string to a file.
The CSV library makes it possible to write an array to a file (in a certain form). The best way to get an array with all values from a hash is to use the values method btw. So:

require 'csv'
h = {:name=>"GAURISH SHARMA",
 :ca=>"97",
 :cb=>"69",
 :ba_lab=>"69",
 :bb_lab=>"69",
 :grand_total=>"975",
 :result=>"PASS"}

CSV.open("resultdata.csv", "a") do |csv|    
  csv << h.values
end

resultdata.csv will look like

GAURISH SHARMA,97,69,69,69,975,PASS