The process of transferring information from a JSON API to TypeScript models

Question

The process of transferring information from a JSON API to TypeScript models

When working with my JSON API in my services, I need to pass the data to my models. What is the most efficient way to accomplish this task?

Currently, I am following this process:

import { Attachment } from '.';

export class Contact {
  id: number;
  attachments: Attachment[] = [];

  static fromJSON(data) {
    let contact = new Contact();
    contact.id = data.id;

    // Attachments?
    for(let attachment of data.attachments) {
      contact.attachments.push( Attachment.fromJSON(attachment) );
    }
    return contact;
  }
}

}

Any suggestions on better approaches?

javascript json api angular typescript

Answer 1

Answer №1

It seems like you're looking to extract information from a JSON string that's received from a service.

Assuming you have the following code to retrieve the JSON data:

   that.db.getTodoListFromServer(this)
                .done(msg => {
                    if (msg != undefined) {
                        // Here, 'msg' contains the JSON object
                 })
                .fail(msg => {
                 });

At this point, there are two approaches you can take:

If you know the structure of the JSON string, you can directly pass each element to your model as you've already done in your current solution.

2. Create an interface that matches the structure of the returned JSON object (typescript supports interfaces). In the example below, we define an interface named IToDoModel. By aligning the interface with the structure of the JSON data, assigning the JSON response to the interface doesn't result in errors.

 export interface ToDoModel {
        Id: number;
        ToDo: string;
    }

...  

that.db.getTodoListFromServer(this)
            .done(msg => {
                 if (msg != undefined) {
                     // 'todo' now holds a list of IToDoModel objects
                     var todo: Array<ToDoModel> = msg;
              })
            .fail(msg => {
                     // Handle Errors   
             });

I trust this explanation helps clarify things for you!

Answer 2

It seems like you're looking to extract information from a JSON string that's received from a service.

Assuming you have the following code to retrieve the JSON data:

   that.db.getTodoListFromServer(this)
                .done(msg => {
                    if (msg != undefined) {
                        // Here, 'msg' contains the JSON object
                 })
                .fail(msg => {
                 });

At this point, there are two approaches you can take:

If you know the structure of the JSON string, you can directly pass each element to your model as you've already done in your current solution.

2. Create an interface that matches the structure of the returned JSON object (typescript supports interfaces). In the example below, we define an interface named IToDoModel. By aligning the interface with the structure of the JSON data, assigning the JSON response to the interface doesn't result in errors.

 export interface ToDoModel {
        Id: number;
        ToDo: string;
    }

...  

that.db.getTodoListFromServer(this)
            .done(msg => {
                 if (msg != undefined) {
                     // 'todo' now holds a list of IToDoModel objects
                     var todo: Array<ToDoModel> = msg;
              })
            .fail(msg => {
                     // Handle Errors   
             });

I trust this explanation helps clarify things for you!

Answer 3

Answer №2

An easy method is to directly convert attachments to an array of type Array<Attachment>.

import { Attachment } from '.';

export class Contact {
  id: number;
  attachments: Attachment[] = [];

  static fromJSON(data) {
    let contact = new Contact();
    contact.id = data.id;

    // Converting attachments JSON to `Array<Attachment>`.
    contact.attachments = <Array<Attachment>>data.attachments;

    return contact;
   }
 }
}

Answer 4

An easy method is to directly convert attachments to an array of type Array<Attachment>.

import { Attachment } from '.';

export class Contact {
  id: number;
  attachments: Attachment[] = [];

  static fromJSON(data) {
    let contact = new Contact();
    contact.id = data.id;

    // Converting attachments JSON to `Array<Attachment>`.
    contact.attachments = <Array<Attachment>>data.attachments;

    return contact;
   }
 }
}

The process of transferring information from a JSON API to TypeScript models

Answer №1

Answer №2

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