Parse JSON where object is variable

Question

I get the following JSON response for Alpha vantage Stock API:

    "Time Series (Daily)": {
        "2018-07-09": {
            "1. open": "142.6000",
             ...
        },

I get different dates depending on the location of the stock exchange. On some, it might say "2018-07-09", and on others "2018-07-10".

Is there a way to reach the attributes of an object without typing the object, something along the lines of:

["Time Series (Daily)"]["first_child"]["1. open"]

Using:

["Time Series (Daily)"][0]["1. open"]

doesn't work.

This seems relevant. stackoverflow.com/questions/983267 Worth mentioning that this will be somewhat performance-taxing if your object is very large/has many properties. — getfugu
– getfugu, Commented Jul 10, 2018 at 2:27
Thanks for that, I've looked at that question, however it doesn't help me that much as I'm parsing it with rails. Using the index of [0], returns nothing. — Crashtor
– Crashtor, Commented Jul 10, 2018 at 2:31

sawa · Accepted Answer · 2018-07-10 03:06:58Z

4

ruby_hash["Time Series (Daily)"].values.first["1. open"]

edited Jul 10, 2018 at 3:06

answered Jul 10, 2018 at 2:41

sawa

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3 Comments

Crashtor Over a year ago

Syntax error? @result = @parse_result["Time Series (Daily)"]values.first["1. open"]

sawa Over a year ago

@Crashtor Sorry, missed a period before values. Fixed.

getfugu Over a year ago

This answer solves this specific case, but it does not handle retrieving properties other than the first one of the object.

getfugu · Accepted Answer · 2018-07-10 03:17:37Z

1

Adapted from How can I get the key Values in a JSON array in ruby?

require 'json'
myData = JSON.parse('{"A": {"B": {"C": {"D": "open sesame"}}}}')

def getProperty(index, parsedData)
  return parsedData[parsedData.keys[index]]
end  

myDataFirstProperty = getProperty(0, myData) # => {"B"=>{"C"=>{"D"=>"open sesame"}}}

evenDeeper = getProperty(0, myDataFirstProperty) # => {"C"=>{"D"=>"open sesame"}}

This answer can also get the Nth property of the JSON, unlike the accepted answer which can only get the first.

edited Jul 10, 2018 at 3:17

answered Jul 10, 2018 at 2:47

getfugu

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2 Comments

Crashtor Over a year ago

This only gets me to where I would before, ( ["2018-07-09"] ) - I need to go 1 step down. I feel like such a noob.

getfugu Over a year ago

Use keys again on the next object within json. repl.it/repls/SophisticatedFavorableRobodoc. Worth noting that my answer can get properties other than the first property, which cannot be done with the accepted answer.

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