I have a method returning a ResponseEntity<Any> and taking a payload, which is of type ObjectNode. I am trying to do the following, but the cast is not correct:
val objectNodeList = responseEntity.body as List<ObjectNode>
How do you convert a ResponseEntity<Any> to a List<ObjectNode>?
Thank you
If the responseEntity.body is of type ObjectNode, then you can't cast it safely to anything else than that. If you really want a list from it, you can just make a simple list of one element with it:
val objectNodeList = listOf(responseEntity.body as ObjectNode)
Related
I have some JSON data in Redshift table of type character varying. An example entry is:
[{"value":["*"], "key":"testData"}, {"value":"["GGG"], key: "differentData"}]
I want to return vales based on keys, how can i do this? I'm attempting to do something like
json_extract_path_text(column, 'value') but unfortunately it errors out. Any ideas?
So the first issue is that your string isn't valid JSON. There are mismatched and missing quotes. I think you mean:
[{"value":["*"], "key":"testData"}, {"value":["GGG"], "key": "differentData"}]
I don't know if this is a data issue or a transcription error but these functions won't work unless the json text is valid.
The next thing to consider is that at the top level this json is an array so you will need to use json_extract_array_element_text() function to pick up an element of the array. For example:
json_extract_array_element_text('json string', 0)
So putting this together we can extract the first "value" with (untested):
json_extract_path_text(
json_extract_array_element_text(
'[{"value":["*"], "key":"testData"}, {"value":["GGG"], "key": "differentData"}]', 0
), 'value'
)
Should return the string ["*"].
The problem
Each entity owns an id and a json field. That json field simply stores a json list of objects.
Entity{ id, json }
"1, '[{"tag": "Player"}, {"position": {"x": 20, "y": 20}}]'"
The order of those json objects is not always the same and i want to update the json object inside the array where "tag" :"Player". I basically wanna change the tag.
I tried to use json_replace, but it didnt worked because it seems like that function does not accept the $** wildcard. But i cant use $[0] because that json object is not always at the first position. Thats what i tried.
UPDATE entity
SET jsonComponents = JSON_REPLACE(
jsonComponents ,
'$**.tag' ,
'NewTag'
)
WHERE
entity.id = 1
The Question
How are we supposed to modify/remove an json object inside an pure json list, if we dont know where its located at ? How can we modify/remove a json object inside a list regardless of its position inside the list ?
Im actually very glad for any help on this topic, couldnt find anything about it...
The solution
If we dont know the path of the json object we seek to modify... we simply query for the path using json_search
update entity
set jsonComponents = JSON_REPLACE(
jsonComponents,
JSON_UNQUOTE(json_search(jsonComponents, 'one', 'Player')),
'NewTag'
)
where entity.id = 0
I have searched what I can and I don't seem to be finding the answer I need. Granted I may not be wording it properly. I have tried using .find or even .rindex to count backwards, but no such luck. The value I receive from the JSON looks something like this:
"AdditionalData":"<Data><Entry Key=\"utm_campaign\" Value=\"j2c\" />
<Entry Key=\"utm_medium\" Value=\"cpc\" /><Entry Key=\"utm_source\"
Value=\"j2c\" /><Entry Key=\"job_id\" Value=\"300_xxxx_10703\" /></Data>"
I need to be able to grab the value for the key "job_id", so the "300_xxxx_11233". This value will change per object returned by the JSON response. Any help would be appreciated, and please let me know if this is already out there and I just missed it.
If the response format remains the same with every request, you could use a plain regexp expression to fetch your data, even without parsing JSON. Example:
response = "<Data><Entry Key=\"utm_campaign\" Value=\"j2c\" /><Entry Key=\"utm_medium\" Value=\"cpc\" /><Entry Key=\"utm_source\" Value=\"j2c\" /><Entry Key=\"job_id\" Value=\"300_xxxx_10703\" /></Data>"
match = response.match(%r{job_id\\?"\s+Value=\\?"(.+)\\?"}i)
match[1] if match # => "300_xxxx_10703"
If the response format can change (for example, if the order of the attributes of Entry element can change), then you need to parse JSON and use some HTML parser, such as Nokigiri, to fetch required attrbute. Code example:
parsed_response = JSON.parse(response)
doc = Nokogiri::HTML(parsed_response['AdditionalData'])
job_id = nil
doc.css('Entry').each do |el|
if el['Key'] == 'job_id'
job_id = el['Value']
break
end
end
So I have a JSON file of a somewhat known format { String => JSON::Type, ... }. So it is basically of type Hash(String, JSON::Type). But when I try and read it from file to memory like so: JSON.parse(File.read(#cache_file)).as(Hash(String, JSON::Type)) I always get an exception: can't cast JSON::Any to Hash(String, JSON::Type)
I'm not sure how I am supposed to handle the data if I can't cast it.
What I basically want to do is the following:
save JSON::Type data under a String key
replace JSON::Type data with other JSON::Type data under a String key
And of course read from / write to file...
Here's the whole thing I've got so far:
class Cache
def initialize(#cache_file = "/tmp/cache_file.tmp")
end
def cache(cache_key : (String | Symbol))
mutable_cache_data = data
value = mutable_cache_data[cache_key.to_s] ||= yield.as(JSON::Type)
File.write #cache_file, mutable_cache_data
value
end
def clear
File.delete #cache_file
end
def data
unless File.exists? #cache_file
File.write #cache_file, {} of String => JSON::Type
end
JSON.parse(File.read(#cache_file)).as(Hash(String, JSON::Type))
end
end
puts Cache.new.cache(:something) { 10 } # => 10
puts Cache.new.cache(:something) { 'a' } # => 10
TL;DR I want to read a JSON file into a Hash(String => i_dont_care), replace a value under a given key name and serialize it to file again. How do I do that?
JSON.parse returns an JSON::Any, not a Hash so you can't cast it. You can however access the underlying raw value as JSON.parse(file).raw and cast this as hash.
Then your code is basically working (I've fixed a few error): https://carc.in/#/r/28c1
You can use use Hash(String, JSON::Type).from_json(File.read(#cache_file)). Hopefully you can restrict the type of JSON::Type down to something more sensible too. JSON::Any and JSON.parse_raw are very much a last resort compared to simply representing your schema using Hash, Array and custom types using JSON.mapping.
Let's say i have a JSON object:
myJson1={
key1:value1,
key2:value2
}
myJson2={};
and another json Object myJson2
When i run
myJson2 = myJson1;
All think goes well the first object is equal to the second.
But now if i try to use myJson2 like this,
var val = myJson2.key1;
console.log(val); is empty !!!
I have make some search and i found something about "proto"
Swagin9 is right - make sure your assignment statement is correct. I would comment on that post, but I don't have enough rep so I'll add this here - make sure value1 and value2 are defined. By themselves, they don't mean anything. Either put them in quotes, make them ints or booleans, etc. or define them as variables before instantiating myJson1 to make sure they actually mean something. Even with the correct assignment statement, you'll still get an error if your JSON objects are defined the way they are right now.
So for example, this produces an error:
myJson1={
key1: value1,
key2: value2
}
myJson2={};
myJson2 = myJson1;
console.log(myJson2.key1);
This does not produce an error:
myJson1={
key1: "value1",
key2: "value2"
}
myJson2={};
myJson2 = myJson1;
console.log(myJson2.key1);
It looks like you're using the wrong variable to assign to myJson2.
Should be
myJson2 = myJson1;