How to assign an enum value to a JSON object in an Angular application

Question

How to assign an enum value to a JSON object in an Angular application

I am currently dealing with a scenario where I have a constant requestBody object being defined. It contains various properties like clientId, orderingId, receivedSignatureFlag, saturdayDeliveryFlag, and so on.

const requestBody: RequestBody = {
  clientId: clientId,
  orderingId: 113875599,
  receivedSignatureFlag: 'N',
  saturdayDeliveryFlag: 'N',
  deliveryMethodOptionCode: 'USPS',
  orderItemsList: [
    {
      itemCode: 'A123'
      transferCode: 'MAIL',
      specialHandling: 'N',
      deliveryExternalFlag: 'Y',
      orderQuantityAmount: 1,

    }
  ]
};

To make the code more structured and maintainable, I decided to create an enum called ReqBodyEnum to hold all the string values that are used in the requestBody object.

export enum ReqBodyEnum {
  RCVD_FLAG = 'N',
  SAT_DELIVERY_FLAG = 'N',
}

Now, here comes the issue. When trying to set the receivedSignatureFlag property to the value from the enum, it doesn't seem to work as expected.

receivedSignatureFlag:ReqBodyEnum[ReqBodyEnum.RCVD_FLAG]  -> this isnt working.

I also attempted another approach:

receivedSignatureFlag:ReqBodyEnum.RCVD_FLAG

However, none of these methods provided the desired outcome. So, I'm looking for suggestions on how to correctly set the value from an enum in this context. Any ideas or best practices would be greatly appreciated!

json angular typescript enums

Answer 1

Answer №1

It appears that there may be a misinterpretation of what an enum represents. An enum can be thought of as a set of predefined values (constants) for a specific attribute.

For instance, in TypeScript, you could define an enum like this:

enum VehicleType {
  motorcyle = 'motorcycle',
  car = 'car',
  truck = 'truck',
  van = 'van'
}

class Vehicle {
  ...
  type: VehicleType;
  ...
}

To adapt this concept to your scenario, consider creating enums for each relevant attribute and defining a type for the request body. Then, apply this type to the constant in your controller and use the corresponding enums to assign values to the attributes. Here's an example:

// Potentially a class, but I've used an interface for this example
interface RequestBody {
    clientId: number;
    orderingId: number;
    receivedSignatureFlag: ReceivedSignature; // Separate enum created for these properties   
    saturdayDeliveryFlag: SaturdayDelivery;   
    deliveryMethodOptionCode: string;         // Could potentially also be an enum
    orderItemsList: any[];                    // Using a generic type here for simplicity
}

enum ReceivedSignature {
    N = 'N',
    Y = 'Y',
    DIGITAL = 'DIGITAL'
}

enum SaturdayDelivery {
    N = 'N',
    Y = 'Y',
}

// Type definition for requestBody
const requestBody: RequestBody = {
    clientId: clientId,
    orderingId: 113875599,
    receivedSignatureFlag: ReceivedSignature.N,
    saturdayDeliveryFlag: SaturdayDelivery.N,
    deliveryMethodOptionCode: 'USPS',
    orderItemsList: [
        {
            itemCode: 'A123',
            transferCode: 'MAIL',
            specialHandling: 'N',
            deliveryExternalFlag: 'Y',
            orderQuantityAmount: 1,
        }
    ]
};

If the flags only have binary values ('N' or 'Y'), it might be more suitable to use primitive boolean types instead. Additionally, note the inclusion of the DIGITAL constant in the ReceivedSignature enum, which is necessary for that particular property. However, the necessity of the enum for the saturdayDeliveryFlag property could be debated.

Answer 2

It appears that there may be a misinterpretation of what an enum represents. An enum can be thought of as a set of predefined values (constants) for a specific attribute.

For instance, in TypeScript, you could define an enum like this:

enum VehicleType {
  motorcyle = 'motorcycle',
  car = 'car',
  truck = 'truck',
  van = 'van'
}

class Vehicle {
  ...
  type: VehicleType;
  ...
}

To adapt this concept to your scenario, consider creating enums for each relevant attribute and defining a type for the request body. Then, apply this type to the constant in your controller and use the corresponding enums to assign values to the attributes. Here's an example:

// Potentially a class, but I've used an interface for this example
interface RequestBody {
    clientId: number;
    orderingId: number;
    receivedSignatureFlag: ReceivedSignature; // Separate enum created for these properties   
    saturdayDeliveryFlag: SaturdayDelivery;   
    deliveryMethodOptionCode: string;         // Could potentially also be an enum
    orderItemsList: any[];                    // Using a generic type here for simplicity
}

enum ReceivedSignature {
    N = 'N',
    Y = 'Y',
    DIGITAL = 'DIGITAL'
}

enum SaturdayDelivery {
    N = 'N',
    Y = 'Y',
}

// Type definition for requestBody
const requestBody: RequestBody = {
    clientId: clientId,
    orderingId: 113875599,
    receivedSignatureFlag: ReceivedSignature.N,
    saturdayDeliveryFlag: SaturdayDelivery.N,
    deliveryMethodOptionCode: 'USPS',
    orderItemsList: [
        {
            itemCode: 'A123',
            transferCode: 'MAIL',
            specialHandling: 'N',
            deliveryExternalFlag: 'Y',
            orderQuantityAmount: 1,
        }
    ]
};

If the flags only have binary values ('N' or 'Y'), it might be more suitable to use primitive boolean types instead. Additionally, note the inclusion of the DIGITAL constant in the ReceivedSignature enum, which is necessary for that particular property. However, the necessity of the enum for the saturdayDeliveryFlag property could be debated.

How to assign an enum value to a JSON object in an Angular application

Answer №1

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