I try to pass some students data through json in wordpress. The data is taken from csv file and it has a header line and 4 lines of values. I send data to php using
JSON.stringify(inp).
The data is sent without any problem and I decode it using json_decode: $csvdata=json_decode(str_replace("\\","",$_POST['body2']));
-- I use str_replace() because without it the data is not read properly -- $csvdata is ok. I send it back to my page using wp_send_json($csvdata); and I can see my data in console. However when I try to get the values of $csvdata, whatever I try, I get a result of 3 null, null, null data.
$i=0;
foreach($csvdata as $value) {
$out[$i]=$value->student;
$i++;
}
and
wp_send_json($out);
It should get the values of my data of 'student' field. I tried almost everything with no result. Every time $out returns null, null, null
I tried also $json_decode($_POST['body2'],true) to read data as an array without any luck. Also tried html_entity_decode() or str_replace() with many combinations and always no result
Any advices???
[edit] I tried to manually recreate my csvdata like this:
$data2 = json_decode('[{"student":"1","a1":"0"},{"student":"2","a1":"2"},{"student":"3","a1":"0"},{"student":"4","a1":"3"}]');//works
$a=0;
foreach($data2 as $value) {
$out1[$a]=$value->student;
$a++;`
}
wp_send_json($out1);
Now values are read properly. I notice that on the first place when I wp_send_json($csvdata) in console log there are extra ... (there dots) at the end of each line, which may cause the problem, but I cannot figure out how to solve it...
{student: 1, a1: 0, a2: 0, a3: 0, a4: 0, …}
My data sent to php
console result of $csvdata
After 3 days of attempts I found that the error was because through JSON I was passing metadata together with my data. So I needed to replace JSON.stringify(inp) with JSON.stringify(inp.data) and everything worked.
Related
I've got an object like this one:
{
"content": {
"iteration_size": 1
}
}
I need a JSONPath which returns null if the value of next_item is exactly 1, or the value of iteration_size otherwise. So the above should return null and "iteration_size": 2 should return 2. Is this possible in JSONPath?
I've tried variations on $.content[?(#.iteration_size == 1)].iteration_size, but the two online evaluators I've tried even disagree on the results of several of my attempts.
The use case is the AWS Batch API, where the array size must be either null or a number between 2 and 10,000.
AWS Support suggested that this was not possible, and that I should instead use a branch in the step function. I ended up replacing this:
.next(batch_submit_job)
[…]
with this:
.next(
aws_stepfunctions.Choice(self, "check_maybe_array")
.when(
aws_stepfunctions.Condition.number_equals("$.content.iteration_size", 1),
single_batch_submit_job,
)
.otherwise(array_batch_submit_job)
.afterwards()
)
where only array_batch_submit_job has an array_size. Note how the rest of the step function ended up wrapped inside the last next() call rather than at the top level.
This is strange, I've used json encoding arrays and the output is something like [{" etc, but in another code this time the output is "{"1":{".. causing multiple errors. I don't understand what is going on.
this is the part of the code:
$json_arr = json_decode($json_str, true);
$fecha = date("Y-m-d H:i:s");
foreach (array_column($json_arr, 'f') AS $k => $fecha) {
if($fecha < $ahora){
unset($json_arr[$k]);
}
}
$json_str = json_encode($json_arr,true);//this will be inserted in the DB table
but the $json_str is in the form of "{"1":{".. but I need in the form of [{".
Here some of the images when debugging:
in orange, the json_str is readed from the BD table
after decoding, you see the json_arr is an array of three elements
after deleting some row, you see json_arr is still an array
after encoding the json_arr, I get the "{"1":{" format, in other cases of encoding arrays I had the [{" format, which is what I need.
You are starting with an array of 3 arrays, with the indices of 0, 1, and 2.
Then you are deleting the first one. If you compare your 2nd and 3rd screenshots, specifically the popup portion, you'll see that what you have lost is index 0. Your array now starts with index 1.
But in JavaScript, an array can't start with index 1. It has to start with index 0, so PHP is encoding it as an object, instead of an array.
If you use the PHP function array_values() it will re-index your array and you should be good to go.
I am trying to show the "sgv" value on a Dashing / Smashing dashboard widget. Ultimately I would also like to show the "direction" value as well. I am running into problems pulling that precise value down which changes every 3 to 5 minutes. I have already been able to mirror the exact string using the following:
require 'net/http'
require 'rest-client'
require 'json'
url = "https://dnarnianbg.herokuapp.com/api/v1/entries/current.json"
response = RestClient.get(url)
JSON.parse(response)
# :first_in sets how long it takes before the job is first run. In this case, it is run immediately
current_nightscout = 0
SCHEDULER.every '5m' do
last_nightscout = current_nightscout
current_nightscout = response
send_event('nightscout', { current: current_nightscout, last: last_nightscout })
end
I have also searched the archives several times. I don't wish to write this to a file like this one shows and the duplicate question has been deleted or moved.
I realize that the JSON.parse(response) is just going to parse out whatever I tell it the response equals, but I don't know how to get that response to equal SGV. Maybe the solution isn't in the RestClient, but that is where I am lost.
Here is the JSON URL: http://dnarnianbg.herokuapp.com/api/v1/entries/current.json
EDIT: The output of that link is something like this:
[{"_id":"5ba295ddb8a1ee0aede71822","sgv":87,"date":1537381813000,"dateString":"2018-09-19T18:30:13.000Z","trend":4,"direction":"Flat","device":"share2","type":"sgv"}]
You need something like response[0]["sgv"] which should return 52 if you end up with many items in the list you will need to iterate over them.
The best thing you can do is to break your problem down into easier parts to debug. As you are having problems accessing some JSON via an API you should make a simple script which only does the function you want in order to test it and see where the problem is.
Here is a short example you can put into a .rb file and run;
#!/usr/bin/ruby
require 'open-uri'
require 'json'
test = JSON.parse(open("https://dnarnianbg.herokuapp.com/api/v1/entries/current.json", :read_timeout => 4).read)
puts test[0]["sgv"]
That should return the value from sgv
I realise that short sweet example may be little use as a learner so here is a more verbose version with some comments;
#!/usr/bin/ruby
require 'open-uri'
require 'json'
# Open the URL and read the result. Time out if this takes longer then 4 sec.
get_data = open("https://dnarnianbg.herokuapp.com/api/v1/entries/current.json", :read_timeout => 4).read
# Parse the response (get_data) to JSON and put in variable output
output = JSON.parse(get_data)
# Put the output to get the 'sgv figure'
p output[0]["sgv"]
It always pays to manually examine the data you get back, in your case the data looks like this (when make pretty)
[
{
"_id": "5ba41a0fb8a1ee0aedf6eb2c",
"sgv": 144,
"date": 1537481109000,
"dateString": "2018-09-20T22:05:09.000Z",
"trend": 4,
"direction": "Flat",
"device": "share2",
"type": "sgv"
}
]
What you actually have is an Array. Your server returns only 1 result, numbered '0' hence you need [0] in your p statement. Once you have accessed the array id then you can simply use the object you need as [sgv]
If your app ever returns more than one record then you will need to change your code to read all of the results and iterate over them in order to get all the values you need.
Here is the final code that made it work
require 'net/http'
require 'json'
require 'rest-client'
# :first_in sets how long it takes before the job is first run. In this case, it is run immediately
current_nightscout = 0
SCHEDULER.every '1m' do
test = JSON.parse(open("https://dnarnianbg.herokuapp.com/api/v1/entries/current.json", :read_timeout => 4).read)
last_nightscout = current_nightscout
current_nightscout = p test[0]["sgv"]
send_event('nightscout', { current: current_nightscout, last: last_nightscout })
end
I can probably eliminate require 'rest-client' since that is no longer being used, but it works right now and that is all that matters.
I have a request that I make in an API using GET
LWP::UserAgent,
the data is returned as JSON, with up to two results at most as follows:
{
"status":1,
"time":1507891855,
"response":{
"prices":{
"nome1\u2122":{
"preco1":1111,
"preco2":1585,
"preco3":1099
},
"nome2":{
"preco1":519,
"preco2":731,
"preco3":491
}
}
}
}
Dump:
$VAR1 = {
'status' => 1,
'time' => 1507891855,
'response' => {
'prices' => {
'nome1' => {
'preco1' => 1111,
'preco3' => 1099,
'preco2' => 1585
},
'nome2' => {
'preco3' => 491,
'preco1' => 519,
'preco2' => 731
}
}
}
};
What I would like to do is:
Take this data and save it in a variable to make a comparison using if with another variable that already has the name stored. The comparison would be with name1 / name2 and if it is true with the other variable it would get preco2 and preco3 to print everything
My biggest problem in the case is that some of these names in JSON contain characters like (TradeMark) that comes as \u2122 (some cases are other characters), so I can not make the comparison with the name of the other variable that is already with the correct name
nome1™
If I could only save the JSON already "converted" the characters would help me with the rest.
Basically after doing the request for the API I want to save the contents in a variable already converting all \u2122 to their respective character (this is the part that I do not know how to do in Perl) and then using another variable to compare them names are equal to show the price
Thanks for the help and any questions please tell me that I try to explain again in another way.
If I understand correctly, you need to get the JSON that you receive in UTF8 format to an internal variable that you can process. For that, you may use JSON::XS:
use utf8;
use JSON::XS;
my $name = "nome1™";
my $var1 = decode_json $utf8_encoded_json_text;
# Compare with name in $name
if( defined $var1->{'response'}->{'prices'}->{$name} ) {
# Do something with the name that matches
my $match = $var1->{'response'}->{'prices'}->{$name};
print $match->{'preco1'}, "\n";
}
Make sure you tell the Perl interpreter that your source is in UTF8 by specifying use utf8; at the beginning of the script. Then make sure you are editing the script with an editor that supports that format.
The function decode_json will return a ref to the converted value. In this case a hash ref. From there you work your way into the JSON.
If you know $name is going to be in the JSON you may omit the defined part. Otherwise, the defined clause will tell you whether the hash value is there. One you know, you may do something with it. If the hash values are a single word with no special characters, you may use $var1->{response}->{prices}->{$name}, but it is always safer to use $var1->{'response'}->{'prices'}->{$name}. Perl gets a bit ugly handling hash refs...
By the way, in JSON::XS you will also find the encode_json function to do the opposite and also an object oriented interface.
I want to parse a string of complex JSON in Pig. Specifically, I want Pig to understand my JSON array as a bag instead of as a single chararray. I found that complex JSON can be parsed by using Twitter's Elephant Bird or Mozilla's Akela library. (I found some additional libraries, but I cannot use 'Loader' based approach since I use HCatalog Loader to load data from Hive.)
But, the problem is the structure of my data; each value of Map structure contains value part of complex JSON. For example,
1. My table looks like (WARNING: type of 'complex_data' is not STRING, a MAP of <STRING, STRING>!)
TABLE temp_table
(
user_id BIGINT COMMENT 'user ID.',
complex_data MAP <STRING, STRING> COMMENT 'complex json data'
)
COMMENT 'temp data.'
PARTITIONED BY(created_date STRING)
STORED AS RCFILE;
2. And 'complex_data' contains (a value that I want to get is marked with two *s, so basically #'d'#'f' from each PARSED_STRING(complex_data#'c') )
{ "a": "[]",
"b": "\"sdf\"",
"**c**":"[{\"**d**\":{\"e\":\"sdfsdf\"
,\"**f**\":\"sdfs\"
,\"g\":\"qweqweqwe\"},
\"c\":[{\"d\":21321,\"e\":\"ewrwer\"},
{\"d\":21321,\"e\":\"ewrwer\"},
{\"d\":21321,\"e\":\"ewrwer\"}]
},
{\"**d**\":{\"e\":\"sdfsdf\"
,\"**f**\":\"sdfs\"
,\"g\":\"qweqweqwe\"},
\"c\":[{\"d\":21321,\"e\":\"ewrwer\"},
{\"d\":21321,\"e\":\"ewrwer\"},
{\"d\":21321,\"e\":\"ewrwer\"}]
},]"
}
3. So, I tried... (same approach for Elephant Bird)
REGISTER '/path/to/akela-0.6-SNAPSHOT.jar';
DEFINE JsonTupleMap com.mozilla.pig.eval.json.JsonTupleMap();
data = LOAD temp_table USING org.apache.hive.hcatalog.pig.HCatLoader();
values_of_map = FOREACH data GENERATE complex_data#'c' AS attr:chararray; -- IT WORKS
-- dump values_of_map shows correct chararray data per each row
-- eg) ([{"d":{"e":"sdfsdf","f":"sdfs","g":"sdf"},... },
{"d":{"e":"sdfsdf","f":"sdfs","g":"sdf"},... },
{"d":{"e":"sdfsdf","f":"sdfs","g":"sdf"},... }])
([{"d":{"e":"sdfsdf","f":"sdfs","g":"sdf"},... },
{"d":{"e":"sdfsdf","f":"sdfs","g":"sdf"},... },
{"d":{"e":"sdfsdf","f":"sdfs","g":"sdf"},... }]) ...
attempt1 = FOREACH data GENERATE JsonTupleMap(complex_data#'c'); -- THIS LINE CAUSE AN ERROR
attempt2 = FOREACH data GENERATE JsonTupleMap(CONCAT(CONCAT('{\\"key\\":', complex_data#'c'), '}'); -- IT ALSO DOSE NOT WORK
I guessed that "attempt1" was failed because the value doesn't contain full JSON. However, when I CONCAT like "attempt2", I generate additional \ mark with. (so each line starts with {\"key\": ) I'm not sure that this additional marks breaks the parsing rule or not. In any case, I want to parse the given JSON string so that Pig can understand. If you have any method or solution, please Feel free to let me know.
I finally solved my problem by using jyson library with jython UDF.
I know that I can solve it by using JAVA or other languages.
But, I think that jython with jyson is the most simplist answer to this issue.