Multi tool use

Observable Data Service implementation with 3 levels dependencies

In my current project I am using the Observable Data Services following the implementation of theses tutorials:
How to build Angular apps using Observable Data Services - Pitfalls to avoid and Angular Observable Data Services.

Everything was ok until the change of my data models.

Now I have 3 levels of dependencies between my models :

The Thread model

export class Thread {
_id: string;
category: Category;
type: string;
title: string;
messages: Message;


The Message model

export class Message {
_id: string;
author: User;
text: string;
comments: Comment;


The Comment model

export class Comment {
_id: string;
author: User;
text: string;


Until now, I implemented the Observable Data Service by maintaining a data store of the parent model (Thread in this case) :

export class ThreadsStoreService {

private _threads: BehaviorSubject<Thread>;
public dataStore: {
threads: Thread
};

constructor(private threadsBackendService: ThreadsBackendService) {
this.dataStore = {
threads:
};
this._threads = new BehaviorSubject();
}

get threads() {
return this._threads.asObservable();
}


And modifying this data store during the change of the children states like this :

Message in this case : Add a new message to the thread

addThreadMessage(threadId: string, body: any) {
this.messagesBackendService.addThreadMessage(threadId, body)
.subscribe(
res => {
const newMessage = new Message({
text: body.text
});

this.threadsStoreService.dataStore.threads.forEach((item, index) => {
if (item._id === threadId) {
this.threadsStoreService.dataStore.threads[index].messages.push(newMessage);
this._messages.next(
Object.assign({}, this.threadsStoreService.dataStore.threads[index]).messages
);
}
});
},
err => console.log('Error creating the message to the thread')
);
}


Now I need to handle the Comment models but If I follow this approach, I will work with "array of array of array" updating an array which is in the Thread data store and I feel it's not right.

Comment

Maybe there is a better solution with the implementation of Observable Data Services?

Thanks in advance for your answers.

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