Validating JSON response using rest client - json

Question

I am trying to use rest client in ruby to parse json but I am stuck how to validate the response (extract values from the response). Also I am trying to validate the valid response code(200) response.code does not work.
Following is the JSON response and Code that uses rest client to get it:
def self.call_legacy_transactions
get_response=RestClient::Request.execute(method: :get, url: 'URL', timeout: 15)
puts(get_response.body)
json_response = JSON.parse(get_response)
//Dont know how to get the values from response hash. Please suggest
end
JSON Response:
[
{
"value": "12345678912345",
"events": [
{
"transaction_id": 205,
"package_name": "",
"event_codes": [
465,
469,
471,
474,
410,
490,
1040
]
},
{
"transaction_id": 204,
"package_name": "",
"event_codes": [
465,
469,
474,
490
]
},
{
"transaction_id": 207,
"package_name": "",
"event_codes": [
465,
469,
471,
474,
490
]
}
]
}
]
I want the event code for each transaction for each value.

Answer 1

If you just want a flat list of event code integers, you can use:
json_response.flat_map do |value_data|
value_data[:events].flat_map do |event_data|
event_data[:event_codes]
end
end
UPDATE based on the comment "I want to extract event codes only where transaction id is 205":
If there could only ever be one item with that transaction ID:
json_response.flat_map do |value_data|
value_data[:events].find do |event_data|
event_data[:transaction_id] == 205
end[:event_codes]
end
If there could be many items with that transaction ID:
json_response.flat_map do |value_data|
value_data[:events].select do |event_data|
event_data[:transaction_id] == 205
end.flat_map do |event_data|
event_data[:event_codes]
end
end

Answer 2

You can call methods on the response to see the body, the response code, etc. More info in the README
Add to your code:
def self.call_legacy_transactions(tx_id = 205)
get_response=RestClient::Request.execute(method: :get, url: 'URL', timeout: 15)
puts(get_response.body)
# check if the response was successful
if get_response.code == 200
# need to parse the body
json_response = JSON.parse(get_response.body)
# the json response is an array of json objects
# we need to iterate over them and grab the value
# in the `events` key and iterate over those and
# select just the ones with the desired transaction id and
# get the value in each of the `event_codes` keys and
# then flatten all the sub arrays into one
event_codes = json_response.flat_map do |data|
data['events'].
select { |event| event['transaction_id'] == tx_id }.
flat_map { |event| event['event_codes'] }
end
event_codes # is now a list of just the event codes
end
end
With the above you can pass the transaction id into the method to get the event codes for any transaction e.g.
call_legacy_transactions 205