Print json to file from ruby program

Question

I have a command line application. the way to call it is :

ruby comb.rb --format json 'journals.csv' 'articles.csv' 'authors.json' > full_articles.json

Basically what it does is combining information from different files (the ones you pass as arguments). The format defines the format of the output.

An array of arrays arribes to the json presenter class (collection in the snipped).

I want to insert to a new file(the one I pass as the last argument) a json object (an array of objects).

This is part of the presenter class:

def call
      collection.each do |line|
        puts as_json line
      end
    end

    private

    def as_json line
      {
        "issn"    => line[0],
        "title"   => line[1],
        "doi"     => line[2],
        "author"  => line[3],
        "journal" => line[4]
      }
    end

The input I get to the full_articles.jsonfile is a set of objects but not encapsulated inside an array. Do you know how to solve this problem?

Could you clarify what you mean by "a set of objects but not encapsulated inside an array." ? — rohit89
– rohit89, Commented Nov 3, 2015 at 15:46

rohit89 · Accepted Answer · 2015-11-03 18:14:03Z

1

If you want it as an array, you can use map

puts collection.map {|line| as_json line}.inspect

or

puts collection.map {|line| as_json line}.to_json

edited Nov 3, 2015 at 18:14

answered Nov 3, 2015 at 16:43

rohit89

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3 Comments

Gerard Morera Over a year ago

Same output as before. @rohit89

rohit89 Over a year ago

Wait, is this supposed to be in json?

Gerard Morera Over a year ago

It has to be in a Json format, but not stringified. @rohit89

Gerard Morera · Accepted Answer · 2017-02-27 18:43:50Z

0

The solution is:

puts collection.map {|line| as_json line}.inspect

The way @rohit89 it was right but the array was not shown. Whit inspect it is shown.

edited Feb 27, 2017 at 18:43

answered Nov 3, 2015 at 18:03

Gerard Morera

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