Assigning values to an object in Angular: A step-by-step guide

Question

Assigning values to an object in Angular: A step-by-step guide

I have a RestApi that sends me the response in Json Format with an address object containing fields such as address1, address2, city, etc. To handle this, I defined an interface within my application to outline these objects:

export interface ISurveyResponseDetail {
  docID?: string;
  permission?: string;
  property?: IProperty;
  surveyID?: string;
}
export interface IProperty {
  address1?: string;
  address2?: string;
  city?: string;
  state?: string;
  zip?: string;

In my TypeScript file, I am looking to utilize a data adapter to map the response into this interface. However, I am unsure of how to properly assign and use the property Object of type IProperty with the values:

static adaptSurveyResponseDetail(data): ISurveyResponseDetail {
        if (data) {
            return {
                property:
                // address1 _.get(data, 'property.address1', null),
                // city _.get(data, 'property.city', null),
                docID: _.get(data, 'docID', null),
                permission: _.get(data, 'permission', null),
                surveyID: _.get(data, 'survey_id', null),
              };
            } else {
            return data;
        }

    }

angular typescript

Answer 1

Answer №1

Consider implementing a function like this:

function parseSurveyResponse(data): SurveyData {
    if (data) {
      return {
        location: {
          street: data.street,
          apt: data.apt,
          city: data.city,
          state: data.state,
          zipCode: data.zipCode,
        },
        documentID: data.documentID,
        access: data.access,
        surveyNumber: data['survey_number'],
      };
    } else {
      return data;
    }
  }

Answer 2

Consider implementing a function like this:

function parseSurveyResponse(data): SurveyData {
    if (data) {
      return {
        location: {
          street: data.street,
          apt: data.apt,
          city: data.city,
          state: data.state,
          zipCode: data.zipCode,
        },
        documentID: data.documentID,
        access: data.access,
        surveyNumber: data['survey_number'],
      };
    } else {
      return data;
    }
  }

Answer 3

Answer №2

My RestApi sends responses in a Json Format.

Perhaps you're overcomplicating things? The HttpClient has user-friendly methods that allow for easy casting of parsed json responses to an interface.

fetchSurveyData() : Observable<ISurveyData> {
  return httpClient.get<ISurveyData>('/api/survey/data');
}

Answer 4

My RestApi sends responses in a Json Format.

Perhaps you're overcomplicating things? The HttpClient has user-friendly methods that allow for easy casting of parsed json responses to an interface.

fetchSurveyData() : Observable<ISurveyData> {
  return httpClient.get<ISurveyData>('/api/survey/data');
}

Answer 5

Answer №3

It is recommended not to make all properties of your interface optional. Instead, consider defining an additional type as partial and utilize it in situations where flexibility is necessary.

export interface ISurveyResponseDetail {
  property: IProperty;
  docID: string;
  permission: string;
  property: IProperty;
  surveyID: string;
}

export type ISurveyResponseDetailPartial = Partial<ISurveyResponseDetail>;

export interface IProperty {
  address1: string;
  address2: string;
  city: string;
  state: string;
  zip: string;
}

export type IPropertyPartial = Partial<IProperty >;

Avoid using underscore to assign default values as null. It is better to define a default object instead.

const DEFAULT_SURVEY_RESPONSE_DETAIL: ISurveyResponseDetail = {
  property: DEFAULT_PROPERTY,
  docID: null,
  permission: null,
  property: null,
  surveyID: null
}

const DEFAULT_PROPERTY: IProperty{
  address1: null,
  address2: null,
  city: null,
  state: null,
  zip: null
}

An adapter is not required to reconstruct the object, as the HTTP client can handle deserializing JSON into a type automatically. If you wish for missing properties to be set as null, create a new object using the default object as a base and then apply the specified values. Any absent properties will remain as null.

getSurveyResponseDetail() : Observable<ISurveyResponseDetail> {
  return this.http.get<ISurveyResponseDetail>(...).pipe(
     map(data => {
        const property = {...DEFAULT_PROPERTY, ...(data.property || {})};
        return {...DEFAULT_SURVEY_RESPONSE_DETAIL, ...data, property};
     });
}

Answer 6

It is recommended not to make all properties of your interface optional. Instead, consider defining an additional type as partial and utilize it in situations where flexibility is necessary.

export interface ISurveyResponseDetail {
  property: IProperty;
  docID: string;
  permission: string;
  property: IProperty;
  surveyID: string;
}

export type ISurveyResponseDetailPartial = Partial<ISurveyResponseDetail>;

export interface IProperty {
  address1: string;
  address2: string;
  city: string;
  state: string;
  zip: string;
}

export type IPropertyPartial = Partial<IProperty >;

Avoid using underscore to assign default values as null. It is better to define a default object instead.

const DEFAULT_SURVEY_RESPONSE_DETAIL: ISurveyResponseDetail = {
  property: DEFAULT_PROPERTY,
  docID: null,
  permission: null,
  property: null,
  surveyID: null
}

const DEFAULT_PROPERTY: IProperty{
  address1: null,
  address2: null,
  city: null,
  state: null,
  zip: null
}

An adapter is not required to reconstruct the object, as the HTTP client can handle deserializing JSON into a type automatically. If you wish for missing properties to be set as null, create a new object using the default object as a base and then apply the specified values. Any absent properties will remain as null.

getSurveyResponseDetail() : Observable<ISurveyResponseDetail> {
  return this.http.get<ISurveyResponseDetail>(...).pipe(
     map(data => {
        const property = {...DEFAULT_PROPERTY, ...(data.property || {})};
        return {...DEFAULT_SURVEY_RESPONSE_DETAIL, ...data, property};
     });
}

Assigning values to an object in Angular: A step-by-step guide

Answer №1

Answer №2

Answer №3

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