通过角度6中的TS创建模型类

Question

我正在尝试在我的角度应用程序中创建一个模型类，如下所示：

export class BookModel {
  public _id:any;
  public authors:any[];
  public categories:any[];
  public isbn:any;
  public longDescription:any;
  public pageCount:any;
  public thumbnailUrl:any;
  public title:any;

  constructor(id,author, category, isbn, longDescription, pageCount, thumbnailUrl, title) {
    this._id = id;
    this.authors.push(author);
    this.categories.push(category);
    this.isbn = isbn;
    this.longDescription = longDescription;
    this.pageCount = pageCount;
    this.thumbnailUrl = thumbnailUrl;
    this.title = title;
  }
}

现在，当我实例化该模型类时，我收到this.authors未定义的错误。 我正在将课程实例化为

let newBook = new BookModel(formValues.id,formValues.AuthorName, formValues.category, formValues.isbn, formValues.description, formValues.pages, formValues.thumbnailUrl, formValues.bookName); 

但是它给了我错误：

Answer 1

您首先需要初始化数组，然后使用它们。初始化将在内存中为其分配空间。

export class BookModel {
  public _id: any;
  public authors: any[] = []; // <- Initializing
  public categories: any[] = []; // <- Initializing
  public isbn: any;
  public longDescription: any;
  public pageCount: any;
  public thumbnailUrl: any;
  public title: any;

  constructor(id, author, category, isbn, longDescription, pageCount, thumbnailUrl, title) {
    this._id = id;
    this.authors.push(author);
    this.categories.push(category);
    this.isbn = isbn;
    this.longDescription = longDescription;
    this.pageCount = pageCount;
    this.thumbnailUrl = thumbnailUrl;
    this.title = title;
  }
}

Answer 2

change:

public authors:any[];
public categories:any[];

to:

public authors: Array<any>;
public categories: Array<any>;