Array of Hashes to CSV with Ruby [closed] - ruby

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I'm working on creating a CSV file of orders from an array of hashes. The name and id in the CSV output need to be the same on each line, but the amount of lines for each order depends on the amount of skus that are in the order.
Is there a simple way to output this orders array?
orders = []
orders << { name:"bob", id:123, sku:[ "123a", "456b", "xyz1" ], qty:[ 2, 4, 1 ] }
orders << { name:"kat", id:987, sku:[ "456b", "aaa0", "xyz1" ], qty:[ 8, 9, 5 ] }
orders << { name:"kat", id:222, sku:[ "123a" ], qty:[ 4 ] }
To a CSV file like this:
name,id,sku,qty
bob,123,123a,2
bob,123,456b,4
bob,123,xyz1,1
kat,987,456b,8
kat,987,aaa0,9
kat,987,xyz1,5
kat,222,123a,4

Answer 1

First of all, let’s prepare the array to dump to CSV:
asarray = orders.map { |e|
[e[:name], e[:id], e[:sku].zip(e[:qty])]
}.map { |e|
e.last.map { |sq| [*e[0..1], *sq] }
}
Now we have raw array ready to be serialized to CSV:
require 'csv'
CSV.open("path/to/file.csv", "wb") do |csv|
csv << ["name", "id", "sku", "qty"]
asarray.each { |order|
order.each { |row|
csv << row
}
}
end

Answer 2

As a variant:
orders = []
orders << { name:"bob", id:123, sku:[ "123a", "456b", "xyz1" ], qty:[ 2, 4, 1 ] }
orders << { name:"kat", id:987, sku:[ "456b", "aaa0", "xyz1" ], qty:[ 8, 9, 5 ] }
orders << { name:"kat", id:222, sku:[ "123a" ], qty:[ 4 ] }
csv = ''
orders.each do |el|
el[:qty].length.times do |idx|
csv += "#{el[:name]},#{el[:id]},#{el[:sku][idx]},#{el[:qty][idx]}\n"
end
end
puts csv
Result:
#> bob,123,123a,2
#> bob,123,456b,4
#> bob,123,xyz1,1
#> kat,987,456b,8
#> kat,987,aaa0,9
#> kat,987,xyz1,5
#> kat,222,123a,4

Answer 3

Try this:
module SKUSeparator
def map_by_skus
inject([]) do |csv, order|
order[:sku].each_with_index do |sku, index|
csv << [order[:name], order[:id], order[:sku][index], order[:qty][index]]
end
csv
end
end
def to_csv
map_by_skus.map { |line| line.join(",") }.join("\n")
end
end
ORDERS = [
{:name=>"bob", :id=>123, :sku=>["123a", "456b", "xyz1"], :qty=>[2, 4, 1]},
{:name=>"kat", :id=>987, :sku=>["456b", "aaa0", "xyz1"], :qty=>[8, 9, 5]},
{:name=>"kat", :id=>222, :sku=>["123a"], :qty=>[4]}
]
ORDERS.extend(SKUSeparator).map_by_skus # =>
# [
# ["bob", 123, "123a", 2],
# ["bob", 123, "456b", 4],
# ["bob", 123, "xyz1", 1],
# ["kat", 987, "456b", 8],
# ["kat", 987, "aaa0", 9],
# ["kat", 987, "xyz1", 5],
# ["kat", 222, "123a", 4]
# ]
ORDERS.extend(SKUSeparator).to_csv # =>
# bob,123,123a,2
# bob,123,456b,4
# bob,123,xyz1,1
# kat,987,456b,8
# kat,987,aaa0,9
# kat,987,xyz1,5
# kat,222,123a,4