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;
}
Related
I am trying to use the group by function on a JSON array using the inner JSON value as a key as shown below. But unable to read the inner JSON value. Here is my JSON array.
NotificationData = [
{
"eventId":"90989",
"eventTime":"2019-12-11T11:20:53+04:00",
"eventType":"yyyy",
"event":{
"ServiceOrder":{
"externalId":"2434",
"priority":"1"
}
}
},
{
"eventId":"6576",
"eventTime":"2019-12-11T11:20:53+04:00",
"eventType":"yyyy",
"event":{
"ServiceOrder":{
"externalId":"78657",
"priority":"1"
}
}
}
]
GroupBy Logic:
const groupBy = (array, key) => {
return array.reduce((result, currentValue) => {
(result[currentValue[key]] = result[currentValue[key]] || []).push(
currentValue
);
return result;
}, {});
};
const serviceOrdersGroupedByExternalId = groupBy(this.NotificationData, 'event.ServiceOrder.externalId');
//this line of code is not working as
// it is unable to locate the external id value.
Desired output
{ "2434":[{
"eventId":"90989",
"eventTime":"2019-12-11T11:20:53+04:00",
"eventType":"yyyy",
"event":{
"ServiceOrder":{ "priority":"1" }
}
}],
"78657":[{
"eventId":"6576",
"eventTime":"2019-12-11T11:20:53+04:00",
"eventType":"yyyy",
"event":{
"ServiceOrder":{ "priority":"1" }
}
}]
}
Does this solves your purpose?
let group = NotificationData.reduce((r, a) => {
let d = r[a.event.ServiceOrder.externalId] = [...r[a.event.ServiceOrder.externalId] || [], a];
return r;
}, {});
console.log(group);
Try like this:
result = {};
constructor() {
let externalIds = this.NotificationData.flatMap(item => item.event.ServiceOrder.externalId);
externalIds.forEach(id => {
var eventData = this.NotificationData.filter(
x => x.event.ServiceOrder.externalId == id
).map(function(item) {
delete item.event.ServiceOrder.externalId;
return item;
});
this.result[id] = eventData;
});
}
Working Demo
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); }
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);
I found many solutions to find depth of nodes in a nested json file. but it throws me an error "maximum recursion depth exceeded "
when it set maximum recursion limit, it says "process exceeded with some error code"
As a part of my problem, I also need to find out key names of each node in the json file.
example json :
"attachments": {
"data": [
{
"media": {
"image": {
"height": 400,
"src": "https://scontent.xx.fbcdn.net/v/t1.0-1/10250217_10152130974757825_8645405213175562082_n.jpg?oh=904c1785fc974a3208f1d18ac07d59f3&oe=57CED94D",
"width": 400
}
},
"target": {
"id": "74286767824",
"url": "https://www.facebook.com/LAInternationalAirport/"
},
"title": "Los Angeles International Airport (LAX)",
"type": "map",
"url": "https://www.facebook.com/LAInternationalAirport/"
}
]
}
the output should be:
nodes:
[data [media [image[height,width,src]], target[id,url], title, type, url]]
depth: 4
If anyone else came here and found that the accepted answer does not work because Object.keys() for a string returns an array of each character of string and thus for either large objects or objects with large strings it just fails.
Here is something that works ->
function getDepth(obj){
if(!obj || obj.length===0 || typeof(obj)!=="object") return 0;
const keys = Object.keys(obj);
let depth = 0;
keys.forEach(key=>{
let tmpDepth = getDepth(obj[key]);
if(tmpDepth>depth){
depth = tmpDepth;
}
})
return depth+1;
}
Exmaple - https://jsfiddle.net/95g3ebp7/
Try the following function:
const getDepth = (
// eslint-disable-next-line #typescript-eslint/no-explicit-any
obj: Record<string, any>,
tempDepth?: number
): number => {
let depth = tempDepth ? tempDepth : 0;
if (obj !== null) {
depth++;
if (typeof obj === 'object' && !Array.isArray(obj)) {
const keys = Object.keys(obj);
if (keys.length > 0)
depth = Math.max(
...keys.map((key) => {
return getDepth(obj[key], depth);
})
);
} else if (Array.isArray(obj)) {
if (obj.length > 0)
depth = Math.max(
...obj.map((item) => {
return getDepth(item, depth);
})
);
}
}
return depth;
};
If you try this, I believe you have to get 7.
console.log(getDepth({
a: {
b: { a: [{ a: { a: [] } }] }
}
}));
function geth(obj) {
var depth = 0;
var k = Object.keys(obj);
console.log(k);
for (var i in k) {
var tmpDepth = geth(obj[k[i]]);
if (tmpDepth > depth) {
depth = tmpDepth
}
}
return 1 + depth;
}
{
"isSuccessful": true,
"resultSet": [
{
"name": "pradeep",
"password": 123,
"timestamp": "2014-04-08T12:58:45.000Z"
},
{
"name": "dileep",
"password": 1234,
"timestamp": "2014-04-08T13:00:52.000Z"
}
]
}
This invocation result i have got by using Sql adapter so how to parse this invocation result and how can i display name,password,timestamp from this JSON object.Do i need to use HTTP Adapter.
If you want to get the length of results you should use result.invocationResult.resultSet.length which will give you the total number of results, where items is the response coming from the adapter and invocationResult contains the results and other paramaters, from which you will have to access the results for accessing only the particular output.To get value call
result.invocationResult.resultSet.name[position]
Like that call all the fields password,timestamp with position
in for loop
function handleSuccess(result) {
var invocationResult = result.invocationResult;
var isSuccessful = invocationResult.isSuccessful;
if (true == isSuccessful) {
var result = invocationResult.resultSet;
for ( var i = 0; i < result.length; i++) {
alert(result.name[i]);
alert(result.password[i]);
alert(result.timestamp[i]);
}
} else {
alert("error");
}