Angluar's pipe filter failing to provide unique outcomes

My application utilizes the same service data on both a Parent and Child page.

While attempting to filter the data for unique values based on a specific column using ngx-filter-pipe module, I am encountering an issue where all values are still being returned.

How can I ensure that only distinct values are returned?

Here is my code:

.module.ts-

import { NgModule }      from '@angular/core';
import { NgPipesModule } from 'ngx-pipes';
@NgModule({
   imports: [
       NgPipesModule
     ]
})
...

.component.html-

<div padding=true>
  <ul>
    <li *ngFor="let group of musicList| unique: PLAYLIST_GROUP"></li>
  </ul>
</div>

Data retrieved from the service:

[
 {
   "KEYS": 1,
   "ARTIST": "Jamila Woods",
   "TITLE": "LSD",
   "ALBUM": "HEAVN",
   "PLAYLIST_GROUP": "RnB/Soul",
   "COUNT": 3
 },
 {
   "KEYS": 2,
   "ARTIST": "Travis Scott",
   "TITLE": "SICKO MODE",
   "ALBUM": "ASTROWORLD",
   "PLAYLIST_GROUP": "Hip Hop",
   "COUNT": 1
 },
 {
   "KEYS": 3,
   "ARTIST": "Rihanna",
   "TITLE": "ANTI",
   "ALBUM": "Yeah, I Said it",
   "PLAYLIST_GROUP": "RnB/Soul",
   "COUNT": 3
 },
 {
   "KEYS": 4,
   "ARTIST": "Summer Walker",
   "TITLE": "Girls Need Love",
   "ALBUM": "Last Day of Summer",
   "PLAYLIST_GROUP": "RnB/Soul",
   "COUNT": 3
 }
]
angulartypescriptfilteringhttpmodulepipes-filters

Answer №1

The unique feature in ngx-pipes documentation is quite interesting. It mentions the need for an additional pair of quotes when using the option.

Here's how you can use it: array | unique: 'Property (Optional)'

<div padding=true>
  <ul>
    <li *ngFor="let item of itemList | unique: 'CATEGORY'"></li> <!--Don't forget the quotes-->
  </ul>
</div>

Answer №2

Experiment with using the property's name enclosed in single quotation marks.

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