Iterate an array through arrays and hashes in Ruby on Rails

Question

Lets say I have this data :

[{"sku"=>"reprint"}, [], nil, {"quantity"=>"1"}, [], nil, {"shippingOptions"=>"PQRS"},
[{"option"=>"PQRS"}], nil, {"abc"=>"abcccc"}, 
[], nil,{"sku"=>"poster"}, 
[], nil, {"quantity"=>"2"}, [], nil, {"shippingOptions"=>"MNLIJK"},
[{"option"=>"MNL"}, {"option"=>"IJK"}], nil, {"sku"=>"cards"}, 
[], nil, {"quantity"=>"5"},
[], nil, {"shippingOptions"=>"DEFABC"}, [{"option"=>"DEF"}, {"option"=>"ABC"}], nil]

I want to iterate this data and print it in html in a proper format using Ruby on Rails I'm new to this technology. Any help is appreciated!

Use an each loop to iterate through the data and output it... If you want more information on a step, show us what you have and provide more details on your application. — Veger
– Veger, Commented Dec 13, 2012 at 13:28
Maybe you could let us know what output you would expect for this data — alexsanford1
– alexsanford1, Commented Dec 13, 2012 at 13:31
Thanks all for the reply..But im not aware of iterating the inner details of this..I want each to them to be shown in a separate line with key value pair..Kindly help me in iterating this..As I have both Array and Hash inside the outer array,..how do i iterate both of them together? — unknown
– unknown, Commented Dec 13, 2012 at 15:03

unknown · Accepted Answer · 2012-12-14 18:08:21Z

2

.flatten might be handy here. If you're not fussed about the structure, I'd just flatten it before iterating then you don't have to worry about varying depth.

1.9.3p194 :001 > root = [{"sku"=>"reprint"}, [], nil, {"quantity"=>"1"}, [], nil, {"shippingOptions"=>"PQRS"},
1.9.3p194 :002 >     [{"option"=>"PQRS"}], nil, {"abc"=>"abcccc"}, 
1.9.3p194 :003 >     [], nil,{"sku"=>"poster"}, 
1.9.3p194 :004 >     [], nil, {"quantity"=>"2"}, [], nil, {"shippingOptions"=>"MNLIJK"},
1.9.3p194 :005 >     [{"option"=>"MNL"}, {"option"=>"IJK"}], nil, {"sku"=>"cards"}, 
1.9.3p194 :006 >     [], nil, {"quantity"=>"5"},
1.9.3p194 :007 >     [], nil, {"shippingOptions"=>"DEFABC"}, [{"option"=>"DEF"}, {"option"=>"ABC"}], nil]
 => [{"sku"=>"reprint"}, [], nil, {"quantity"=>"1"}, [], nil, {"shippingOptions"=>"PQRS"}, [{"option"=>"PQRS"}], nil, {"abc"=>"abcccc"}, [], nil, {"sku"=>"poster"}, [], nil, {"quantity"=>"2"}, [], nil, {"shippingOptions"=>"MNLIJK"}, [{"option"=>"MNL"}, {"option"=>"IJK"}], nil, {"sku"=>"cards"}, [], nil, {"quantity"=>"5"}, [], nil, {"shippingOptions"=>"DEFABC"}, [{"option"=>"DEF"}, {"option"=>"ABC"}], nil] 
1.9.3p194 :008 > root.flatten!
 => [{"sku"=>"reprint"}, nil, {"quantity"=>"1"}, nil, {"shippingOptions"=>"PQRS"}, {"option"=>"PQRS"}, nil, {"abc"=>"abcccc"}, nil, {"sku"=>"poster"}, nil, {"quantity"=>"2"}, nil, {"shippingOptions"=>"MNLIJK"}, {"option"=>"MNL"}, {"option"=>"IJK"}, nil, {"sku"=>"cards"}, nil, {"quantity"=>"5"}, nil, {"shippingOptions"=>"DEFABC"}, {"option"=>"DEF"}, {"option"=>"ABC"}, nil]  
1.9.3p194 :011 > root.each do |r| 
1.9.3p194 :012 >     next if r.nil?
1.9.3p194 :013?>     puts r.to_s
1.9.3p194 :014?> end
{"sku"=>"reprint"}
{"quantity"=>"1"}
{"shippingOptions"=>"PQRS"}
{"option"=>"PQRS"}
{"abc"=>"abcccc"}
{"sku"=>"poster"}
{"quantity"=>"2"}
{"shippingOptions"=>"MNLIJK"}
{"option"=>"MNL"}
{"option"=>"IJK"}
{"sku"=>"cards"}
{"quantity"=>"5"}
{"shippingOptions"=>"DEFABC"}
{"option"=>"DEF"}
{"option"=>"ABC"}

RE: comments.

data = [{"sku"=>"reprint"}, [], nil, {"quantity"=>"1"}, [], nil, {"shippingOptions"=>"PQRS"}, [{"option"=>"PQRS"}], nil, {"abc"=>"abcccc"}, [], nil, {"sku"=>"poster"}, [], nil, {"quantity"=>"2"}, [], nil, {"shippingOptions"=>"MNLIJK"}, [{"option"=>"MNL"}, {"option"=>"IJK"}], nil, {"sku"=>"cards"}, [], nil, {"quantity"=>"5"}, [], nil, {"shippingOptions"=>"DEFABC"}, [{"option"=>"DEF"}, {"option"=>"ABC"}], nil]
hash_collection = data.flatten.map(&:to_a).flatten(1).reduce({}) { |h,(k,v)| (h[k] ||= []) << v; h}

produces:

=> {"sku"=>["reprint", "poster", "cards"], "quantity"=>["1", "2", "5"], "shippingOptions"=>["PQRS", "MNLIJK", "DEFABC"], "option"=>["PQRS", "MNL", "IJK", "DEF", "ABC"], "abc"=>["abcccc"]}

I actually want my new data to be some what like this :

{{"sku"=>"Reprint"},{"quantity"=>"1"},{"option"=>"PQRS"}}
{{"sku"=>"Poster"},{"quantity"=>"2"},{"option"=>"MNL"},{"option"=>"IJK"}}
{{"sku"=>"Cards"}, {"quantity"=>"5"},{"option"=>"DEF"},{"option"=>"ABC"}}
{{"sku"=>"Books"},{"quantity"=>"6"},{"option"=>"QIU"},{"option"=>"PSJ"},   option"=>"IQA"},{"suboption"=>"ikh"},{"subsuboption"=>"uuuuuuuuuuuuuuuuu"}}

edited Dec 14, 2012 at 18:08

unknown

235 bronze badges

answered Dec 13, 2012 at 17:07

Mike Campbell

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3 Comments

unknown Over a year ago

If I want to group particular things and print then how would I be able to do it? For example, I want to group sku,quantity,option together..Any help is appreciated

Mike Campbell Over a year ago

On your flattened array: data.map(&:to_a).flatten(1).reduce({}) { |h,(k,v)| (h[k] ||= []) << v; h}. Credit to this fella.

unknown Over a year ago

Im now getting the data like this {"option"=>[nil], "PQRS"=>[nil]} {"sku"=>[nil], "Reprint"=>[nil]} {"quantity"=>[nil], "1"=>[nil]} {"option"=>[nil], "MNL"=>[nil]} {"option"=>[nil], "IJK"=>[nil]} {"sku"=>[nil], "Poster"=>[nil]} {"quantity"=>[nil], "2"=>[nil]} {"option"=>[nil], "DEF"=>[nil]} {"option"=>[nil], "ABC"=>[nil]}

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