Convert csv to json in ruby - ruby

Question

CSV
id,modifier1_name,modifier2_price,modifier2_name,modifier2_price,modifier2_status
1,'Small',10,'Large',20,'YYY'
2,'Small',20,'Large',30,'YYY'
JSON
[
{
id: 1,
modifier: [
{name: 'Small', price: 10},
{name: 'Large', price: 20, status: 'YYY'}]
},
{
id: 2,
modifier: [
{name: 'Small', price: 20},
{name: 'Large', price: 30, status: 'YYY'}],
}
]
How to convert CSV to Json in this case when modifiers can be different ?

Answer 1

You will need to map the modifiers yourself, as there is no built-in method to map hash values into an array from your logic:
JSON.pretty_generate(CSV.open('filename.csv', headers: true).map do |row|
modifier = {}
row.each do |k, v|
if k =~ /modifier(.)_(.*)$/
(modifier[$1] ||= {})[$2] = v
end
end
{ id: row['id'],
modifier: modifier.sort_by { |k, v| k }.map {|k, v| v }
}
end)
For the file*
id,modifier1_name,modifier1_price,modifier2_name,modifier2_price,modifier2_status
1,Small,10,Large,20,YYY
2,Small,20,Large,30,YYY
*I made some changes to the file you show, since it will not give you the required result - you state modifier2_price twice, for example
You will get:
[
{
"id": "1",
"modifier": [
{
"name": "Small",
"price": "10"
},
{
"name": "Large",
"price": "20",
"status": "YYY"
}
]
},
{
"id": "2",
"modifier": [
{
"name": "Small",
"price": "20"
},
{
"name": "Large",
"price": "30",
"status": "YYY"
}
]
}
]

Answer 2

require 'csv'
require 'json'
CSV.open('filename.csv', :headers => true).map { |x| x.to_h }.to_json