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new-chat.component.ts
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new-chat.component.ts
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import {Component, OnInit} from '@angular/core';
import {MeteorObservable, ObservableCursor} from 'meteor-rxjs';
import {NavController, ViewController, AlertController} from 'ionic-angular';
import {Meteor} from 'meteor/meteor';
import {Observable} from 'rxjs/Observable';
import {Chats} from '../../../../both/collections/chats.collection';
import {Users} from '../../../../both/collections/users.collection';
import {User} from '../../../../both/models/user.model';
import template from './new-chat.component.html';
import style from "./new-chat.component.scss";
import 'rxjs/add/operator/mergeMap';
import 'rxjs/add/operator/startWith';
@Component({
selector: 'new-chat',
template,
styles: [
style
]
})
export class NewChatComponent implements OnInit {
users: Observable<User>;
private senderId: string;
constructor(
private navCtrl: NavController,
private viewCtrl: ViewController,
private alertCtrl: AlertController
) {
this.senderId = Meteor.userId();
}
ngOnInit() {
MeteorObservable.autorun().zone().subscribe(() => {
this.users = this.findUsers().zone();
});
}
addChat(user): void {
MeteorObservable.call('addChat', user._id).subscribe({
next: () => {
this.viewCtrl.dismiss();
},
error: (e: Error) => {
this.viewCtrl.dismiss().then(() => {
this.handleError(e)
});
}
});
}
private findUsers(): Observable<User> {
return Chats.find({
memberIds: this.senderId
}, {
fields: {
memberIds: 1
}
})
.startWith([]) // empty result
.mergeMap((chats) => {
const recieverIds = chats
.map(({memberIds}) => memberIds)
.reduce((result, memberIds) => result.concat(memberIds), [])
.concat(this.senderId);
return Users.find({
_id: {$nin: recieverIds}
})
});
}
private handleError(e: Error): void {
console.error(e);
const alert = this.alertCtrl.create({
title: 'Oops!',
message: e.message,
buttons: ['OK']
});
alert.present();
}
}