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How to return results that combine themselves from an attribute the is equal?

I have a database of musical works and in these works the are information about the owners of that works. The owner can be an editor or a composer. There can be many composers and many editors.
Editors and composers have a publishing relationship that is indicated by their attribute called link. So, if an editor has a link = 5 and the composer too, they are linked. Or the editor is the publisher of that composer.
I use this query to get only the musical works that are from the editor I want.
db.works.find({'pro_owners.codigo_ecad': 5546730})
.projection({})
.sort({_id:-1})
.limit(100)
And it retrieves me some documents like these:
{
"_id": "6042617f0732f22da210e7a6",
"codigo_ecad": 16403107,
"iswc": "T0401990268",
"titulo": "YA INTENTE COMPREENDER",
"situacao": "LB",
"data_inclusao": "2017-06-02T03:00:01.000Z",
"pro_owners": [
{
"codigo_ecad": 8096286,
"owner": "JOSIEL DEL CID",
"category": "CA",
"percent": 0,
"link": "2",
"_id": "60426160dca0dd0dc8290d41"
},
{
"codigo_ecad": 381928,
"owner": "THALES ROBERTO DA SILVA",
"category": "CA",
"percent": 0.75,
"link": "1",
"_id": "6042615bdca0dd0dc8290d32"
},
{
"codigo_ecad": 5546730,
"owner": "THALES ROBERTO DA SILVA - EIRELI - ME",
"category": "E",
"percent": 0.25,
"link": "1",
"_id": "6042615bdca0dd0dc8290d33"
}
],
"client_name": "Datha Editora"
}
I would like to know if there is a way query and receive only the unique linked owners of the editor I am interested in. In the above case, just:
{
"codigo_ecad": 381928,
"owner": "THALES ROBERTO DA SILVA",
"category": "CA",
"percent": 0.75,
"link": "1",
"_id": "6042615bdca0dd0dc8290d32"
}
The next step would be a $lookup to the owners collection to return these results with their full data. But it is a plus.

You can accomplish that with aggreation:
$match to select only document containing a pro_owner with the matching code
$addFields with $filter to extract the matching pro_owner into a new field
$addFields/$project with $filter to limit the pro_owners list to those with the same link value as the new field

API call with Axios filtering response.data

I want to get the newest 8 products depend on product's date. I can get the whole products array and filter it as you see below:
const newestProducts= [];
axios.get("http://localhost:3003/products").then(response => {
let products = response.data.sort(function(a, b) {
return new Date(b.date) - new Date(a.date);
});
newstProducts = product.slice(0,7)
});
but this will be so bad if I have thousands of product, and I just need to get the newest 8 Products only
I thought about adding ?_limit=8 to the call
axios.get("http://localhost:3003/products?_limit=8").then{...}
but this also doesn't work propersly as you know because it gets me the only top 8 products of the array
Is there any way to filter the products before I get it from the server or I MUST store them all in var and then filter them
The Json File
"categories": [
{
"id": 9,
"category": "bathroom",
"date": "2020/8/3",
"name": "ullam basin mixer",
"price": 160,
"img_1": "rim_mixer_01.jpg",
"img_2": "rim_mixer_02.jpg",
"rating": 4.5,
"description": "MARMO is a complete series made of 72 models, with different shapes and sizes for different functions, that keeps uncompromised its elegant beauty. This is a Demo Online Store."
},
{
"id": 10,
"category": "bathroom",
"date": "2020/8/19",
"name": "gravida bathtub",
"price": 2100,
"img_1": "inbani_bathtub_01.jpg",
"img_2": "inbani_bathtub_02.jpg",
"rating": 4,
"description": "A young company with a wealth of experience. created in 2004, inbani has evolved into a leader in innovation thanks to a conviction to create products which truly benefit the well-being of the customer. This is a Demo Online Store. No orders shall be fulfilled."
},
{
"id": 11,
"category": "bathroom",
"date": "2020/9/9",
"name": "vulputate mixer",
"price": 300,
"img_1": "marmo_mixer_01.jpg",
"img_2": "marmo_mixer_02.jpg",
"description": "MARMO is a complete series made of 72 models, with different shapes and sizes for different functions, that keeps uncompromised its elegant beauty. This is a Demo Online Store."
},
{
"id": 12,
"category": "bathroom",
"date": "2018/7/17",
"name": "aliquam veneatis bathtub",
"price": 2580,
"img_1": "sa_oche_01.jpg",
"img_2": "sa_oche_02.jpg",
"description": "Its oval, elliptical design with the incongruent walls invokes an avant-garde atmosphere in the bathroom."
},
{
"id": 13,
"category": "kitchen",
"date": "2020/3/13",
"name": "quisque teapot",
"price": 240,
"img_1": "theo_teapot_01.jpg",
"img_2": "theo_teapot_02.jpg",
"description": "Theo Teapot is a Scandinavian-Japanese teapot made from stoneware and bamboo, designed by Unit 10 Design for Stelton. This is a Demo Online Store. No orders shall be fulfilled."
},
{
"id": 14,
"category": "kitchen",
"date": "2020/2/12",
"name": "creamic teapot",
"price": 60,
"img_1": "cer_teapot_01.jpg",
"img_2": "cer_teapot_02.jpg",
"rating": 3.9,
"description": "Matte ceramic tea pot comes with integrated and removable metal tea infuser. Capacity 700 ml (2.96 cups). Dishwasher safe. This ceramic teapot has a white matte finish, coupled with a square shape and curved lines."
},
{
"id": 15,
"category": "kitchen",
"date": "2019/2/1",
"name": "bottle grinders",
"price": 30,
"img_1": "bottle_gringer_01.jpg",
"img_2": "bottle_gringer_02.jpg",
"rating": 4.8,
"description": "Bottle Grinders is a minimal, timeless salt and pepper mill set designed by Norm.Architects for Menu. Steering away from the predictable grinder, the Norm Bottle Grinder is not what you expect to see in a salt and pepper grinder. The form, shaped more like a bottle, cleverly tricks the user to encourage a more playful and experimental interaction with the product. This is a Demo Online Store. No orders shall be fulfilled. Purchase this product"
},
{
"id": 16,
"category": "lighting",
"date": "2020/1/3",
"name": "commodo blown lamp",
"price": 275,
"img_1": "tradition_blown_01.jpg",
"img_2": "tradition_blown_02.jpg",
"description": "Blown lamp SW3 & SW4 by &tradition is a mouth-blown pendant lamp with a quilted pattern, it comes in a translucent variant with a silver lustre or in a opal white version. Blown lamp is fitted with a powder-coated metal suspension. This is a Demo Online Store. No orders shall be fulfilled."
},
{
"id": 17,
"category": "lighting",
"date": "2020/6/9",
"name": "spot table",
"price": 100,
"img_1": "spot_lamp_01.jpg",
"img_2": "spot_lamp_02.jpg",
"rating": 3.4,
"description": "Set the stage. The Spot lamp is a lively, versatile addition to your room. This is a Demo Online Store. No orders shall be fulfilled."
}
]

The problem is not in API Calling... To enhance the performance you have to refractor the DATABASE REQUEST in the backend to get the last 8 products only.
Note:
You make this through the query you send to the database in the controller (ROUTE ) in the backend

How to use multiple attributes in algolia search using Django . Show multiple courses

How to use multiple attributes in algolia search using Django . Show multiple courses
{
"course_": [
{
"interest_min": 11,
"other_fees": 0,
"tution_fees": 56000,
"interest_max": 14,
"duration_max": 7,
"payment_month_min": 4573,
"total": 56000,
"payment_month_max": 2567,
"course_name": "Mtech",
"hostel_fees": 0,
"duration_min": 5,
"course_type": "Full Time",
"duration": "4"
},
{
"interest_min": 7,
"other_fees": 465,
"tution_fees": 35456,
"interest_max": 14,
"duration_max": 5,
"payment_month_min": 2414,
"total": 41385,
"payment_month_max": 483,
"course_name": "Mca",
"hostel_fees": 5464,
"duration_min": 2,
"course_type": "Full Time",
"duration": "2"
}
],
"name": "A. K. Choudhury School Of Information Technology, Kolkata",
"slug": "a-k-choudhury-school-of-information-technology-kolkata",
"country": "India",
"location_type": "Domestic",
"type": "College",
"address": "Kolkata",
"image": "images/a-k-choudhury-school-of-information-technology-kolkata_M9cCiHQ.jpg",
"institute_type": "Private",
"cities": "noida",
"college_facilities": "Sports Transportation",
"approved_by": "University Of Calcutta, Kolkata",
"established": "2005-01-05",
"state": "Up",
"objectID": "2"
}
How to use multiple attributes in algolia search using Django . Show multiple courses
using instantsearch.js in django

If you are searching from your Django back-end, you should use the raw_search method to search within your data and get the corresponding JSON.
You can then loop over the course_ attribute to display the school's courses:
On the other hand, if you want to search from your frontend with instantsearch.js, you should follow the Getting Started Guide: have a look at the Display Results section which explains how you can use a Mustache template to display all the attributes you want from your records.

Append '|' after every array element

I have this JSON & what I want to do is to make genres like this action|adventure|comedy
{
"id": 1,
"key": "deadpool",
"name": "Deadpool",
"description": "A former Special Forces operative turned mercenary is subjected to a rogue experiment that leaves him with accelerated healing powers, adopting the alter ego Deadpool.",
"genres": [
"action",
"adventure",
"comedy"
],
"rate": 8.6,
"length": "1hr 48mins",
"img": "assets/images/movie-covers/deadpool.jpg"
},
{
"id": 2,
"key": "we-are-the-millers",
"name": "We're the Millers",
"description": "A veteran pot dealer creates a fake family as part of his plan to move a huge shipment of weed into the U.S. from Mexico.",
"genres": [
"adventure",
"comedy",
"crime"
],
"rate": 7,
"length": "1hr 50mins",
"img": "assets/images/movie-covers/we-are-the-millers.jpg"
}
my component code snippet
data => {
this.movies = data;
var tempArr= data
var genres;
let genresWithPipe=[];
let len= tempArr.length;
for(var i=0; i<len; i++){
genres=tempArr[i].genres+'|';
// console.log(tempArr[i].genres)
for(var j=0;j<genres.length; j++){
if(j<genres.length-1)
genres[j]= genres[j]+'|';
console.log(genres,data);
//genresWithPipe=genres;
}
}
console.log(this.movies,genres)
}
I have tried to do it with the help of for loop in my component but then when I am displaying it in the html with the help of *ngFor then because it's a local variable,it won't show up. If I store array values in a global variable then the variable only store the last array.

You can use map method in order to achieve your requirement and obtain a more cleaner solution.
The map() method creates a new array with the results of calling a
provided function on every element in the calling array.
Also, you can use join method in order to obtain the structure action|adventure|comedy with | delimiter.
let array=[{ "id": 1, "key": "deadpool", "name": "Deadpool", "description": "A former Special Forces operative turned mercenary is subjected to a rogue experiment that leaves him with accelerated healing powers, adopting the alter ego Deadpool.", "genres": [ "action", "adventure", "comedy" ], "rate": 8.6, "length": "1hr 48mins", "img": "assets/images/movie-covers/deadpool.jpg" }, { "id": 2, "key": "we-are-the-millers", "name": "We're the Millers", "description": "A veteran pot dealer creates a fake family as part of his plan to move a huge shipment of weed into the U.S. from Mexico.", "genres": [ "adventure", "comedy", "crime" ], "rate": 7, "length": "1hr 50mins", "img": "assets/images/movie-covers/we-are-the-millers.jpg" }];
array=array.map(function(item){
item.genres=item.genres.join('|');
return item;
});
console.log(array);

A good solution with Array.map() has been proposed, here is another option with Array.forEach():
const data = [{
"id": 1,
"key": "deadpool",
"name": "Deadpool",
"description": "A former Special Forces operative turned mercenary is subjected to a rogue experiment that leaves him with accelerated healing powers, adopting the alter ego Deadpool.",
"genres": [
"action",
"adventure",
"comedy"
],
"rate": 8.6,
"length": "1hr 48mins",
"img": "assets/images/movie-covers/deadpool.jpg"
},
{
"id": 2,
"key": "we-are-the-millers",
"name": "We're the Millers",
"description": "A veteran pot dealer creates a fake family as part of his plan to move a huge shipment of weed into the U.S. from Mexico.",
"genres": [
"adventure",
"comedy",
"crime"
],
"rate": 7,
"length": "1hr 50mins",
"img": "assets/images/movie-covers/we-are-the-millers.jpg"
}
]
const genres = [];
data.forEach(film => genres.push(film.genres.join("|")));
console.dir(genres);
Note that your data definitely doesn't look like what you put in the code sample, it must be wrapped with [].

Cannot access array objects when that array is itself an attribute of an object

I am unable to access an array of objects that is itself an attribute of a larger object.
console.log(skillprofiles);
console.log(skillprofiles.skills);
The above statements return an array of two objects that each have an attribute that is a, seemingly, valid array of objects ("skills" in this example).
I am unable to access the "skills" array attribute. The data I am ultimately trying to get at is the "item_name" attribute. As far as I know, that should be accessible via:
skillprofiles[0].skills[0].item_name
Interestingly enough, verifying the type of the "skills" attribute with "typeof" returns "object" instead of array. This could be because I am transferring an array of objects from one object to another earlier in my code. I thought I was doing this properly and seemed to have confirmed that by my logging statements.
UPDATE with actual data:
[{
"skillprofile_id": 144,
"skillprofile_name": " On-boarding",
"start_date": "January 30 2012",
"progress": 0,
"complete_date": " ",
"category": 1053,
"skills": [{
"category": "Acquire: Onboard New Hires",
"item_name": "3. On-boarding a New Hire - Day 1",
"skill_type": "activity",
"object_id": 68,
"duration": "8:00:00",
"sco_status_code": 6,
"action": "activity",
"has_forums": false
}, {
"category": "Acquire: Onboard New Hires",
"item_name": "4. On-boarding Checklist",
"skill_type": "activity",
"object_id": 67,
"duration": "1:00:00",
"sco_status_code": 6,
"action": "activity",
"has_forums": false
}]
}, {
"skillprofile_id": 143,
"skillprofile_name": " Setting Up Systems",
"start_date": "January 30 2012",
"progress": 0,
"complete_date": " ",
"category": 1053,
"skills": [{
"category": "Acquire: Onboard New Hires",
"item_name": "1. Office Organization",
"skill_type": "activity",
"object_id": 65,
"duration": "4:00:00",
"sco_status_code": 6,
"action": "activity",
"has_forums": false
}, {
"category": "Acquire: Onboard New Hires",
"item_name": "2. Welcome to the Team Documents",
"skill_type": "activity",
"object_id": 66,
"duration": "2:00:00",
"sco_status_code": 6,
"action": "activity",
"has_forums": false
}, {
"category": "Acquire: Onboard New Hires",
"item_name": "3. Welcome Documents: Feedback ",
"skill_type": "activity",
"object_id": 150,
"duration": "1:00:00",
"sco_status_code": 6,
"action": "activity",
"has_forums": false
}]
}]
UPDATE 2:
Given the responses so far, it seems that I should be able to run the following:
$.each(skillprofiles, function(){
console.log(this.skills)
});
I can do this from the console, but the console statements come back as "undefined" when run from my code

In your first block of code, skills is directly a child of skillprofiles. Whereas in the second one, you write skillprofiles[o].skills. If the first one works, maybe your code should be:
skillprofiles.skills[0].item_name

With that data structure, the proper access would be:
skillprofiles[i].skills[j].item_name
You can see it work here: http://jsfiddle.net/jfriend00/wPLZZ/
skillprofiles is an array of objects so you get an object from the array with:
skillprofiles[i]
Each object in that array, has a number of properties and one of those properties is named skills so you would get that property with
skillprofiles[i].skills
The contents of the skills property is another array so you would get an item from that aray with this:
skillprofiles[i].skills[j]
That array holds objects with their own properties so you would access a specific property with this:
skillprofiles[i].skills[j].item_name