How to save JSON objects into an array

Question

i want to save objects into an array. I have JSON objects and I want to save every object in an array to access every element alone. Can anybody help me?

toArray = JSON.parse(res.body)

categ = Array.new
i = 0

toArray.each do |object|
newMyObject = MyObject.new(object)
categ = Array.new(i, newMyObject)
i = i+1
end

thank you for your comment. how can i do that? i have to access every single element in the json later. — r.az91
– r.az91, Commented Apr 23, 2017 at 9:15
As a note, Ruby strongly encourages using lower-case only variables and method names, so to_array is to be expected here. Capital letters are reserved for ClassName or CONSTANT_NAME situations. — tadman
– tadman, Commented Apr 23, 2017 at 9:39

Ursus · Accepted Answer · 2017-04-23 09:12:16Z

2

Try this one

array_from_json = JSON.parse(res.body)
objects_array = array_from_json.map { |item| MyObject.new(item) }

The issue in your code is that you are creating a new array every iteration.

answered Apr 23, 2017 at 9:12

Ursus

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6 Comments

r.az91 Over a year ago

thank you. can you explain me, what the code does exactly?

Ursus Over a year ago

Probably you don' know map method. That permit you to transform every element of an array and return a new array. In this case we are trasforming every element from the json to a MyObject object and the result is in the objects_array array object.

r.az91 Over a year ago

i get the error: "uninitialized constant MyObject (NameError) Did you mean? Object from test:51:in each' from test:51:in map' from test:51:in `<main>' " Can you help me please?

Ursus Over a year ago

Well, I don't know. I saw that in your code. I though you had a MyObject class defined.

r.az91 Over a year ago

How can i do that? Can you help me please?

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