Require assistance with transforming a JSON string into an object

Question

Require assistance with transforming a JSON string into an object

I've been struggling with converting the JSON object returned from the service to the Directory class. The issue is that the Directory class has an 'expanded' property which is not present in the JSON object. I've tried various methods over the past few days but haven't had any luck.

Thank you in advance for any help or guidance on this matter.

    export class Directory {
       type: string;
       name: string;
       expanded: false;
       directories: Directory[];
       files: File[];
    }
    export class File {
       type: string;
       name: string;
       fileExtension: string;
       size: string;
       lastModified: string;
       downloadUrl: string;
    }

[
    {
        "type": "directory",
        "name": "DIR A",
        "directories": [],
        "files": [
            {
                "type": "file",
                "name": "FILEN.pdf",
                "fileExtension": ".pdf",
                "size": 1000,
                "lastModified": "2020-06-17",
                "downloadUrl": "http://example.com/filename.pdf"
            },
            {
                "type": "file",
                "name": "FILEN-1.pdf",
                "fileExtension": ".pdf",
                "size": 1000,
                "lastModified": "2020-06-15",
                "downloadUrl": "http://example.com/filename-1.pdf"
            }
        ]
    },
    {
        "type": "directory",
        "name": "DIR B",
        "directories": [],
        "files": [
            {
                "type": "file",
                "name": "FILEN-2.pdf",
                "fileExtension": ".pdf",
                "size": 1000,
                "lastModified": "2020-06-12",
                "downloadUrl": "http://example.com/filename-2.pdf"
            }
        ]
    }   
]

I attempted the following approach:

  this.api.getFileUrl().subscribe((response:any) => {
    let directory: Directory = JSON.parse(JSON.stringify(response));
  });

Upon debugging, I noticed that the 'expanded' property is missing in the directory object. By the way, I am relatively new to Typescript and Angular.

angular typescript

Answer 1

Answer №1

Suppose you possess a JSON object stored in a property called data, simply execute the following:

const parsedData: Omit<Directory, 'expanded'> = JSON.parse(data);

Answer 2

Suppose you possess a JSON object stored in a property called data, simply execute the following:

const parsedData: Omit<Directory, 'expanded'> = JSON.parse(data);

Answer 3

Answer №2

Upon reviewing your proposed solution...

this.api.getFileUrl().subscribe((response:any) => {
    //..
}

For this to be accurate and functional, it is necessary for you to update getFileURL() as follows...

this.api.getFileUrl() = from(fetch('SomeJsonPageOfYours.json')).pipe(
    switchMap(response => response.json())
)

If the data structure does not match your expectations, consider how you are subscribing() to this.api.getFileUrl(). Double-check that you are applying the .json() method correctly on the response object. This area might require further examination (as the corresponding code was not provided).

Answer 4

Upon reviewing your proposed solution...

this.api.getFileUrl().subscribe((response:any) => {
    //..
}

For this to be accurate and functional, it is necessary for you to update getFileURL() as follows...

this.api.getFileUrl() = from(fetch('SomeJsonPageOfYours.json')).pipe(
    switchMap(response => response.json())
)

If the data structure does not match your expectations, consider how you are subscribing() to this.api.getFileUrl(). Double-check that you are applying the .json() method correctly on the response object. This area might require further examination (as the corresponding code was not provided).

Answer 5

Answer №3

Construct an interface followed by its implementation:

 export interface IDirectoryStructure {
       category: string;
       name: string;
       subDirectories: Directory[];
       filesList: File[];
    }
     export class Directory implements IDirectoryStructure {
       category: string;
       name: string;
       open: false;
       subDirectories: Directory[];
       filesList: File[];
    }

Next, utilize the defined interface:

this.api.getFileUrl().subscribe((res:any) => {
    let folder: IDirectoryStructure = res;
  });

Answer 6

Construct an interface followed by its implementation:

 export interface IDirectoryStructure {
       category: string;
       name: string;
       subDirectories: Directory[];
       filesList: File[];
    }
     export class Directory implements IDirectoryStructure {
       category: string;
       name: string;
       open: false;
       subDirectories: Directory[];
       filesList: File[];
    }

Next, utilize the defined interface:

this.api.getFileUrl().subscribe((res:any) => {
    let folder: IDirectoryStructure = res;
  });

Answer 7

Answer №4

It's important to note that the type defined in TypeScript does not have any effect during runtime.

In this scenario, the Directory class seems to only have the value of expanded as false, which we can then assign to the response object.

To achieve this, you can follow these steps:

// excluding the expanded property from the Directory type
type IGetFileUrlResponse = Omit<Directory, 'expanded'>; 

this.api.getFileUrl().subscribe((response: IGetFileUrlResponse) => {
    // creating a valid Directory type by adding the expanded property
    let directory: Directory = {
       ...response,
       expanded: false,
    };
 });

Answer 8

It's important to note that the type defined in TypeScript does not have any effect during runtime.

In this scenario, the Directory class seems to only have the value of expanded as false, which we can then assign to the response object.

To achieve this, you can follow these steps:

// excluding the expanded property from the Directory type
type IGetFileUrlResponse = Omit<Directory, 'expanded'>; 

this.api.getFileUrl().subscribe((response: IGetFileUrlResponse) => {
    // creating a valid Directory type by adding the expanded property
    let directory: Directory = {
       ...response,
       expanded: false,
    };
 });

Require assistance with transforming a JSON string into an object

Answer №1

Answer №2

Answer №3

Answer №4

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