How to reduce observable pipelines when fetching user information along with user posts?
Here is my code with 2 services, one is messageService which is used to get user messages and the other is usersService used to get user information based on user_id:
this.messageService.getMessages()
.switchMap(response => {
let resArray: any = response.map(
post => {
return Observable.zip(
this.usersService.getUser(post.user_id),
Observable.of(post)
);
});
return Observable.merge(...resArray)
}).switchMap(res => {
res[1]['user'] = res[0];
this.messages.push(res[1]);
return Observable.of(res[1]);
})
.subscribe(final_post => {
console.log('final post:', final_post)
})
I suppose using merge and then again swtichMap to merge these data is not optimal and best practice.
The question is how should I get user messages using Observable and then getting users information for each message (each message may have different user information), then merging them into one object which finally will be used in the desired component.
javascript angular-2+
asked 3 mins ago
ALH
1012
New contributor
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Here is my code with 2 services, one is messageService which is used to get user messages and the other is usersService used to get user information based on user_id:
this.messageService.getMessages()
.switchMap(response => {
let resArray: any = response.map(
post => {
return Observable.zip(
this.usersService.getUser(post.user_id),
Observable.of(post)
);
});
return Observable.merge(...resArray)
}).switchMap(res => {
res[1]['user'] = res[0];
this.messages.push(res[1]);
return Observable.of(res[1]);
})
.subscribe(final_post => {
console.log('final post:', final_post)
})
I suppose using merge and then again swtichMap to merge these data is not optimal and best practice.
The question is how should I get user messages using Observable and then getting users information for each message (each message may have different user information), then merging them into one object which finally will be used in the desired component.
javascript angular-2+
asked 3 mins ago
ALH
1012
New contributor
ALH is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
Here is my code with 2 services, one is messageService which is used to get user messages and the other is usersService used to get user information based on user_id:
this.messageService.getMessages()
.switchMap(response => {
let resArray: any = response.map(
post => {
return Observable.zip(
this.usersService.getUser(post.user_id),
Observable.of(post)
);
});
return Observable.merge(...resArray)
}).switchMap(res => {
res[1]['user'] = res[0];
this.messages.push(res[1]);
return Observable.of(res[1]);
})
.subscribe(final_post => {
console.log('final post:', final_post)
})
I suppose using merge and then again swtichMap to merge these data is not optimal and best practice.
The question is how should I get user messages using Observable and then getting users information for each message (each message may have different user information), then merging them into one object which finally will be used in the desired component.
javascript angular-2+
asked 3 mins ago
ALH
1012
New contributor
ALH is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Here is my code with 2 services, one is messageService which is used to get user messages and the other is usersService used to get user information based on user_id:
this.messageService.getMessages()
.switchMap(response => {
let resArray: any = response.map(
post => {
return Observable.zip(
this.usersService.getUser(post.user_id),
Observable.of(post)
);
});
return Observable.merge(...resArray)
}).switchMap(res => {
res[1]['user'] = res[0];
this.messages.push(res[1]);
return Observable.of(res[1]);
})
.subscribe(final_post => {
console.log('final post:', final_post)
})
I suppose using merge and then again swtichMap to merge these data is not optimal and best practice.
The question is how should I get user messages using Observable and then getting users information for each message (each message may have different user information), then merging them into one object which finally will be used in the desired component.
javascript angular-2+
javascript angular-2+
asked 3 mins ago
ALH
1012
New contributor
ALH is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
ALH
1012
New contributor
ALH is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
ALH
1012
New contributor
ALH is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 3 mins ago
ALH
1012
asked 3 mins ago
ALH
1012
1012
New contributor
ALH is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
ALH is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
ALH is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
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