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comp.lang.ruby

write multiple key/value to a row using cvs library

Li Chen

7/16/2008 2:57:00 PM

Hi all,

I have a hash containing multiple key/values. I want to wirte all
key/value to the same row using cvs library. Is it possible to do that?
Now I follow the example from the library and I can only write each
key/value to one row and multiple rows from a hash.

Thanks,

Li

##########
EXAMPLE

Write rows to 'csvout' file.

outfile = File.open('csvout', 'wb')
CSV::Writer.generate(outfile) do |csv|
csv << ['c1', nil, '', '"', "\r\n", 'c2']

####here is my modified code###
hash.each_pair{|k,v|csv<<"#{k}","#{v}"}

...
end

outfile.close
############
--
Posted via http://www.ruby-....
2 Answers

Tachikoma

7/17/2008 2:35:00 AM

0

On Jul 16, 10:56 pm, Li Chen <chen_...@yahoo.com> wrote:
> Hi all,
>
> I have a hash containing multiple key/values. I want to wirte all
> key/value to the same row using cvs library. Is it possible to do that?
> Now I follow the example from the library and I can only write each
> key/value to one row and multiple rows from a hash.
>
> Thanks,
>
> Li
>
> ##########
> EXAMPLE
>
>   Write rows to 'csvout' file.
>
>   outfile = File.open('csvout', 'wb')
>   CSV::Writer.generate(outfile) do |csv|
>     csv << ['c1', nil, '', '"', "\r\n", 'c2']
>
>     ####here is my modified code###
>     hash.each_pair{|k,v|csv<<"#{k}","#{v}"}
>
>     ...
>   end
>
>   outfile.close
> ############
> --
> Posted viahttp://www.ruby-....

I tried this:

require 'csv'
outfile = File.open('csvout','wb')
hash = {"a" => 100,"b" => 200,"c" => 300}
CSV::Writer.generate(outfile) do |csv|
csv << hash.to_a.flatten
end

the result is :
a,100,b,200,c,300

I hope this will help

Li Chen

7/17/2008 1:39:00 PM

0

Ikari Shinji wrote:

> I tried this:
>
> require 'csv'
> outfile = File.open('csvout','wb')
> hash = {"a" => 100,"b" => 200,"c" => 300}
> CSV::Writer.generate(outfile) do |csv|
> csv << hash.to_a.flatten
> end
>
> the result is :
> a,100,b,200,c,300


Hi Ikari,

Thank you for your help. I also came out with the same solution:
to convert a hash into an array and so that each array will be write to
the same row in csv.


Li




--
Posted via http://www.ruby-....