Is there a way to link a class's functions to an object in Angular?

I am encountering an issue with storing and retrieving objects of type Order in localstorage. Even though the information stored remains the same, when refreshing the page, the object loses its type identification as Order. This prevents me from being able to call the function getFullName(). The actual Order class is quite expansive and I would prefer not to create a new instance using new Order() every time I retrieve the object from localstorage. I have attempted writing an adapt(order: any): Order function to address this, but it becomes complicated when dealing with data from the database that may have different property names (e.g., Name instead of sName). Writing another function like adapt2(order): Order for such cases would be cumbersome. Can you suggest a better approach for resolving this issue?

ngOnInit(){
    this.order = this.localstorage.retrieve('order') // order.getFullName() is not known
    // should I write a new adapt function or would you recommend me to do something else?
}

Answer №1

This situation is quite common, as JavaScript does not have a uniform method for serializing and deserializing classes. One way to address this issue is by utilizing the typeson package to ensure proper serialization of the class. Alternatively, you can implement a simple solution like the following:

const order = this.localStorage.retrieve('order');
Object.setPrototypeOf(order, Order.prototype);

It's crucial to note that if your class contains properties that are themselves classes, you will need to apply the same treatment recursively. This complexity underscores the benefits of using a tool such as typeson.

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