How to serialize and deserialize object keeping its class name in Typeorm
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I am a beginner in event sourcing and I am using NestJS with Typeorm. I am using the AggregateRoot from the '@nestjs/cqrs' library. This library needs the constructor name of an event when it applies the event.
Anyway, I think my problem is related to Typeorm. I don't know how to specify the way a postgres json gets deserialized.
I persist my events in a postgresql db using the following model
@Entity()
export class Event {
@PrimaryGeneratedColumn('uuid')
id: string;
@Column()
aggregateId: number;
@Column('json')
payload: object;
@Column()
className: string;
}
My events are stored this:
handle(event: ArticleCreatedEvent) {
const articleCreatedEvent = new Event();
articleCreatedEvent.payload = event;
articleCreatedEvent.aggregateId = event.id;
const { constructor } = Object.getPrototypeOf(event);
articleCreatedEvent.className = constructor.name;
this.EventRepository.save(articleCreatedEvent);
return;
}
My problem: I need to retrieve my ArticleCreatedEvent from the db. When I do so using the EventRepository of Typeorm, I have all the payload of my event. BUT, since the type of the payload in the model is object, the constructor name is 'object', and my AggregateRoot handles event base on the constructor name, I would like it to be 'ArticleCreatedEvent'.
Can I specify to Typeorm that the constructor should be ArticleCreatedEvent and then pass the payload ? If not do you know a way to store an object in postgres keeping the prototype of the object (e.g. keeping the constructor name)?
Thanks !
postgresql typescript event-sourcing nestjs typeorm
asked Nov 24 '18 at 20:28
Sammy TeilletSammy Teillet
13
add a comment |
I am a beginner in event sourcing and I am using NestJS with Typeorm. I am using the AggregateRoot from the '@nestjs/cqrs' library. This library needs the constructor name of an event when it applies the event.
Anyway, I think my problem is related to Typeorm. I don't know how to specify the way a postgres json gets deserialized.
I persist my events in a postgresql db using the following model
@Entity()
export class Event {
@PrimaryGeneratedColumn('uuid')
id: string;
@Column()
aggregateId: number;
@Column('json')
payload: object;
@Column()
className: string;
}
My events are stored this:
handle(event: ArticleCreatedEvent) {
const articleCreatedEvent = new Event();
articleCreatedEvent.payload = event;
articleCreatedEvent.aggregateId = event.id;
const { constructor } = Object.getPrototypeOf(event);
articleCreatedEvent.className = constructor.name;
this.EventRepository.save(articleCreatedEvent);
return;
}
My problem: I need to retrieve my ArticleCreatedEvent from the db. When I do so using the EventRepository of Typeorm, I have all the payload of my event. BUT, since the type of the payload in the model is object, the constructor name is 'object', and my AggregateRoot handles event base on the constructor name, I would like it to be 'ArticleCreatedEvent'.
Can I specify to Typeorm that the constructor should be ArticleCreatedEvent and then pass the payload ? If not do you know a way to store an object in postgres keeping the prototype of the object (e.g. keeping the constructor name)?
Thanks !
postgresql typescript event-sourcing nestjs typeorm
asked Nov 24 '18 at 20:28
Sammy TeilletSammy Teillet
13
add a comment |
I am a beginner in event sourcing and I am using NestJS with Typeorm. I am using the AggregateRoot from the '@nestjs/cqrs' library. This library needs the constructor name of an event when it applies the event.
Anyway, I think my problem is related to Typeorm. I don't know how to specify the way a postgres json gets deserialized.
I persist my events in a postgresql db using the following model
@Entity()
export class Event {
@PrimaryGeneratedColumn('uuid')
id: string;
@Column()
aggregateId: number;
@Column('json')
payload: object;
@Column()
className: string;
}
My events are stored this:
handle(event: ArticleCreatedEvent) {
const articleCreatedEvent = new Event();
articleCreatedEvent.payload = event;
articleCreatedEvent.aggregateId = event.id;
const { constructor } = Object.getPrototypeOf(event);
articleCreatedEvent.className = constructor.name;
this.EventRepository.save(articleCreatedEvent);
return;
}
My problem: I need to retrieve my ArticleCreatedEvent from the db. When I do so using the EventRepository of Typeorm, I have all the payload of my event. BUT, since the type of the payload in the model is object, the constructor name is 'object', and my AggregateRoot handles event base on the constructor name, I would like it to be 'ArticleCreatedEvent'.
Can I specify to Typeorm that the constructor should be ArticleCreatedEvent and then pass the payload ? If not do you know a way to store an object in postgres keeping the prototype of the object (e.g. keeping the constructor name)?
Thanks !
postgresql typescript event-sourcing nestjs typeorm
asked Nov 24 '18 at 20:28
Sammy TeilletSammy Teillet
13
I am a beginner in event sourcing and I am using NestJS with Typeorm. I am using the AggregateRoot from the '@nestjs/cqrs' library. This library needs the constructor name of an event when it applies the event.
Anyway, I think my problem is related to Typeorm. I don't know how to specify the way a postgres json gets deserialized.
I persist my events in a postgresql db using the following model
@Entity()
export class Event {
@PrimaryGeneratedColumn('uuid')
id: string;
@Column()
aggregateId: number;
@Column('json')
payload: object;
@Column()
className: string;
}
My events are stored this:
handle(event: ArticleCreatedEvent) {
const articleCreatedEvent = new Event();
articleCreatedEvent.payload = event;
articleCreatedEvent.aggregateId = event.id;
const { constructor } = Object.getPrototypeOf(event);
articleCreatedEvent.className = constructor.name;
this.EventRepository.save(articleCreatedEvent);
return;
}
My problem: I need to retrieve my ArticleCreatedEvent from the db. When I do so using the EventRepository of Typeorm, I have all the payload of my event. BUT, since the type of the payload in the model is object, the constructor name is 'object', and my AggregateRoot handles event base on the constructor name, I would like it to be 'ArticleCreatedEvent'.
Can I specify to Typeorm that the constructor should be ArticleCreatedEvent and then pass the payload ? If not do you know a way to store an object in postgres keeping the prototype of the object (e.g. keeping the constructor name)?
Thanks !
postgresql typescript event-sourcing nestjs typeorm
postgresql typescript event-sourcing nestjs typeorm
asked Nov 24 '18 at 20:28
Sammy TeilletSammy Teillet
13
asked Nov 24 '18 at 20:28
Sammy TeilletSammy Teillet
13
asked Nov 24 '18 at 20:28
Sammy TeilletSammy Teillet
13
asked Nov 24 '18 at 20:28
Sammy TeilletSammy Teillet
13
asked Nov 24 '18 at 20:28
Sammy TeilletSammy Teillet
13
13
add a comment |
add a comment |
0
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