This post will help you convert JSON objects into an OpenStruct object, which will allow us to extract value directly using . dot notation e.g: json_result.key
If you are using with any JSON API services, than you might have come across a situation where you have to extract certain value, check if it exists in JSON response or not and doing that in traditional way is too much pain
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{
"name": "John doe",
"email": "john@example.com",
"address": {
"primary": {
"city": "Pokhara"
}
}
}
Now obviously, we want to extract a value of city but for that, we need to go with the pain of verifying each parent keys to have a child result like so:
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def city(json)
return if json['address'].blank?
return if json['address']['primary'].blank?
json['address']['primary']['city']
end
city(json)
=> "Pokhara"
JSON to OpenStruct object
we can simplyfy this by using Safe navigation operator and OpenStruct class.
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res = JSON.parse(json, object_class: OpenStruct)
res.address&.primary&.city
=> "Pokhara"
Hash to OpenStruct object
we can also convert hash to openstruct object by converting hash into JSON using .to_json method:
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res = JSON.parse(hsh.to_json, object_class: OpenStruct)
res.address&.primary&.city
=> "Pokhara"