My json looks like this, it consists of objects and a few other properties:
let jsonobject = {
"one":{ id:'Peter'},
"two":{ id:'John'},
"three":{ id:'Ko'},
"id":1,
"name":'Jack'
}
I want to convert this to an array with lodash or something, the result would be:
[{ id:'Peter'},
{ id:'John'},
{ id:'Ko'}]
So I can use _.values(jsonobject) but how can I ditch the id and the name property which are obviously no objects? I want a compact solution and/or use lodash.
(1) Get all values for the outer object, (2) filter non object items.
_.filter(_.values(jsonobject), _.isObject)
Or alternatively the chained variant:
_(jsonobject).values().filter(_.isObject).value()
You can simply use filter with an isObject predicate to get the values.
var result = _.filter(jsonobject, _.isObject);
let jsonobject = {
"one": {
id: 'Peter'
},
"two": {
id: 'John'
},
"three": {
id: 'Ko'
},
"id": 1,
"name": 'Jack'
};
var result = _.filter(jsonobject, _.isObject);
console.log(result);
body > div { min-height: 100%; top: 0; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.js"></script>
You can loop over the key in your object and store those that are objects in an array.
var obj = {
"one":{ id:'Peter'},
"two":{ id:'John'},
"three":{ id:'Ko'},
"id":1,
"name":'Jack'
};
var arr = [];
for(var key in obj){
if(typeof obj[key] === 'object'){
arr.push(obj[key]);
}
}
console.log(arr);
Related
I have an json string, which looks like this:
{
\"request\": {
\"requestId\": \"dd92f43ec593d2d8db94193b7509f5cd\",
\"notificationType\": \"EntityAttribute\",
\"notificationSource\": \"ODS\"
},
\"entityattribute\": {
\"entityId\": \"123\",
\"attributeType\": \"DATE_OF_BIRTH\"
}
}
I want to deserialized entityattribute to an object:
public class EntityAttributeNotification {
private String attributeType;
private String entityId;
}
One way is to extract entityId and attributeType first using the json path(i.e entityattribute/entityId)and create an object EntityAttributeNotification.
I want to know if there is a way to directly deserialized entityattribute to EntityAttributeNotification.
I have also tried with JsonMixin annotation but this does not apply here.
Through the following method you can extract Parameters and Values of nested JSON .
const object1 ={
"request": {
"requestId": "dd92f43ec593d2d8db94193b7509f5cd",
"notificationType": "EntityAttribute",
"notificationSource": "ODS"
},
"entityattribute": {
"entityId": "123",
"attributeType": "DATE_OF_BIRTH"
}
};
var keys = [];
for (let [key, value] of Object.entries(object1)) {
if(typeof value == 'object'){
keys.push(key);
for (let [key1, value1] of Object.entries(value)) {
keys.push(key1);
}
}
else{
keys.push(key);
}
}
console.log(keys);
I passed the following object:
var myVar = { typeA: { option1: "one", option2: "two" } }
I want to be able to pull out the key typeA from the above structure.
This value can change each time so next time it could be typeB.
So I would like to know if there is any way to do that
I was able to solve using 'keys'
for a json example like this:
{
"1-0001": {
"name": "red",
"hex": "FF0000"
},
"1-0002": {
"name": "blue",
"hex": "0000FF"
},
"1-0003": {
"name": "green",
"hex": "008000"
}
}
I was able to use
Map<String, dynamic> decoded = json.decode(jsonString);
for (var colour in decoded.keys) {
print(colour); // prints 1-0001
print(decoded[colour]['name']); // prints red
print(decoded[colour]['hex']); // prints FF0000
}
To get all filenames you can use:
var data = ...
var filenames = [];
for(var i = 0; i < data.length; i++) {
var item = data[0]['files'];
var key = item.keys.first;
var filename = item[key]['filename'];
filenames.add(filename);
}
print(filenames);
You need to define a data type.
It is basically a map of (key value-pair) where key is changed as stated in question typeA or typeB
This Object has 2 properties option1 and option2 which is also strings.
Here is the sample code to construct model and how to use it
import 'package:TestDart/TestDart.dart' as TestDart;
main(List<String> arguments) {
var map = new Map<String, MyObject>();
map['typeA'] = new MyObject("one", "two");
map['typeB'] = new MyObject("one", "two");
print(map['typeA'].toString());
print(map['typeA'].toString());
}
class MyObject {
String _option1;
String _option2;
MyObject(this._option1, this._option2);
String get option2 => _option2;
String get option1 => _option1;
#override
String toString() {
return 'MyObject{option1: $_option1, option2: $_option2}';
}
}
Relevant answer
map.forEach((key, value) {
print("Key : ${key} value ${value}");
});
postgesql returns the json_build_object as a parent for each grouped json array like this:
{
"status": "success",
"stories": [{
"json_build_object": {
"CNN": []
}
},
{
"json_build_object": {
"FOX": []
}
},
{
"json_build_object": {
"Huffpost": []
}
},...
Postgresql returns the "json_build_object" as a key.
Is it possible to replace with the stories.source value returned by the group by?
SELECT json_build_object(source, json_agg(stories.*))
FROM stories
GROUP BY stories.source
ORDER BY source;
Optimal solution would be a response like this:
stories:
CNN: [],
FOX: []...
I'm sure I'm missing a best practice for returning JSON in Postgresql...
There must be a way to do this in SQL, but for the lack of it now, you can convert that stories property into the right object:
function convert(stories) {
const res = {};
for (let i = 0; i < stories.length; i++) {
const obj = stories[i].json_build_object;
const name = Object.keys(obj)[0];
res[name] = obj[name];
}
return res;
}
I have a mongo collection where documents have aprox the following structure:
item{
data{"emailBody":
"{\"uniqueKey\":\" this is a stringified json\"}"
}
}
What I want to do is to use 'uniqueKey' as an indexed field, to make an "inner join" equivalant with items in a different collection.
I was thinking about running a loop on all the documents -> parsing the json -> Saving them as new property called "parsedEmailBody".
Is there a better way to handle stringified json in mongo?
The only way is to loop through the collection, parse the field to JSON and update the document in the loop:
db.collection.find({ "item.data.emailBody": { "$type": 2 } })
.snapshot().forEach(function(doc){
parsedEmailBody = JSON.parse(doc.item.data.emailBody);
printjson(parsedEmailBody);
db.collection.updateOne(
{ "_id": doc._id },
{ "$set": { "item.data.parsedEmailBody": parsedEmailBody } }
);
});
For large collections, leverage the updates using the Bulk API:
var cursor = db.collection.find({ "item.data.emailBody": { "$type": 2 } }).snapshot(),
ops = [];
cursor.forEach(function(doc){
var parsedEmailBody = JSON.parse(doc.item.data.emailBody);
ops.push({
"updateOne": {
"filter": { "_id": doc._id },
"update": { "$set": { "item.data.parsedEmailBody": parsedEmailBody } }
}
});
if (ops.length === 500) {
db.collection.bulkWrite(ops);
ops = [];
}
});
if (ops.length > 0) { db.collection.bulkWrite(ops); }
I have a complex JSON Object like this:
var requestData = { __batchRequests: [ { __changeRequests: [
{ requestUri: "Customers", method: "POST", headers: { "Content-ID": "1" }, data: {
CustomerID: 400, CustomerName: "John"
} }
] } ] };
I am trying to do two things:
Declare this object but with the variable data empty
With a loop, add items dynamically to the data object,
How can I do it?
This isn't too complex an object. And it isn't JSON until it's converted into a string.
Right now, it's just plain-ol' JS objects and arrays.
Breaking that down into its elements might look like this:
var requestData = {};
requestData.__batchRequests = [];
requestData.__batchRequests[0] = {};
requestData.__batchRequests[0].__changeRequests = [];
requestData.__batchRequests[0].__changeRequests[0] = {};
requestData.__batchRequests[0].__changeRequests[0].requestUri = "Customers";
requestData.__batchRequests[0].__changeRequests[0].method = "POST";
requestData.__batchRequests[0].__changeRequests[0].headers = { "Content-ID" : "1" };
requestData.__batchRequests[0].__changeRequests[0].data = {};
Aside from the repeats, what do you see?
Personally, I see that __changeRequests[0] is an object as simple as:
var changeRequest = {
requestUri : "Customers",
method : "POST",
headers : { "Content-ID" : "1" },
data : {}
};
I also see that I can just push that onto my array of change requests:
requestData.__batchRequests[0].__changeRequests.push(changeRequest);
Right?
I also know that my changeRequest variable still points to the one that I just added to the array, and whatever I change on the object will show up as changed in the array's reference to the object, too:
changeRequest.data.CustomerName = "Bob";
changeRequest.data.CustomerID = "204";
requestData.__/*...*/changeRequests[0].data.CustomerName; // Bob
So how about writing yourself some helper-functions?
function extend (obj, additions) {
var key;
for (key in obj) { if (additions.hasOwnProperty(key)) {
obj[key] = additions[key];
}
}
function makeChangeRequest (url, method, headers, data) {
var request = {
requestUri : url,
method : method,
headers : {},
data : {}
};
extend(request.headers, headers);
extend(request.data, data);
return request;
}
function getBatch (num) { return requestData.__batchRequests[num]; }
var changeReq = makeChangeRequest("Customers",
"POST",
{ "Content-ID" : "1" },
{ CustomerName : "Bob", CustomerID : "2012" });
var batch = getBatch(0);
batch.__changeRequests.push(changeReq);
If you want to add more data to changeReq.data later:
extend(changeReq.data, { Address : "33 Nowhere Rd.", City : "Splitsville" });
For the first part of your question, you can initialize data with an empty associative array:
var requestData = { __batchRequests: [ { __changeRequests: [
{ requestUri: "Customers", method: "POST", headers: { "Content-ID": "1" }, data: {} }
] } ] };
This next part assumes, perhaps incorrectly, that you can use jQuery. It also assumes that you have an array containing all of the relevant key value pairs.
var customerDeetsArray =[{CustomerID: 400}, {CustomerName: "John"}];
for (var i in customerDeetsArray) {
requestData.data = $.extend(requestData.data, customerDeetsArray[i]);
}
See working example which makes use of console.debug:
http://jsfiddle.net/4Rh72/6/