[英]Error "Object is of type unknown" when using graphql-codegen in the Angular application
I have this Angular application which enjoys graphql-codegen to generate model for the application through graphql end point.我有这个 Angular 应用程序,它喜欢 graphql-codegen 通过 graphql 端点为应用程序生成模型。
the component includes an image tag inside a container:该组件在容器内包含一个图像标签:
<ng-container *ngFor="let blog of (blogPosts | async)?.blogPost | paginate: config">
<img class="image" *ngIf="blog.image.urls" src="http://localhost:5002{{blog.image.urls}}"
alt="Placeholder image">
</ng-container>
The compiler complains on both (blogPosts | async)?.blogPost
and image part of the blog the former says:编译器抱怨(blogPosts | async)?.blogPost
和博客的图像部分,前者说:
Argument of type '({ __typename?: "BlogPost" | undefined; path: string; subtitle?: string | null | undefined; displayText?: string | null | undefined; owner: string; publishedUtc?: any; markdownBody?: { ...; } | ... 1 more ... | undefined; image?: { ...; } | ... 1 more ... | undefined; } | null)[] | null | undefined' is not assignable to parameter of type 'Collection<unknown>'
And the latter says:后者说:
Object is of type 'unknown'
The typescript part of the component includes a graphql query which is in the generated code by the graphql-codegen library:该组件的 typescript 部分包括一个 graphql 查询,该查询位于 graphql-codegen 库生成的代码中:
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import { Observable } from 'rxjs';
import { map, take} from 'rxjs/operators';
import { BlogPostsQuery, BlogPostsGQL } from '../graphql/graphql';
@Component({
selector: 'app-blog',
templateUrl: './blog.component.html',
styleUrls: ['./blog.component.scss']
})
export class BlogComponent implements OnInit {
public responsive: boolean = true;
blogPosts!: Observable<BlogPostsQuery>;
modalIsActive!: boolean;
values!: string;
public config = {
itemsPerPage: 1,
// tslint:disable-next-line: radix
currentPage: parseInt(sessionStorage.getItem('blogPage') || '') || 0
};
constructor(
private router: Router,
private allBlogPostGQL: BlogPostsGQL
) {
}
ngOnInit() {
this.blogPosts = this.allBlogPostGQL
.watch()
.valueChanges
.pipe(
map(blogs => blogs.data
));
}
onPageChange(number: number) {
sessionStorage.setItem('blogPage', JSON.stringify(number));
this.config.currentPage = number;
console.log('eeeee', number);
}
showMore(name: string) {
this.router.navigate(['/blog', name]);
console.log('aaaaaaaa', this.config.currentPage)
}
}
As shown in the code above BlogPostsGQL is the source of data in the blog component and its code is as below:如上代码所示,BlogPostsGQL 是博客组件中的数据来源,其代码如下:
import { gql } from 'apollo-angular';
import { Injectable } from '@angular/core';
import * as Apollo from 'apollo-angular';
export type Maybe<T> = T | null;
export type InputMaybe<T> = Maybe<T>;
export type Exact<T extends { [key: string]: unknown }> = { [K in keyof T]: T[K] };
export type MakeOptional<T, K extends keyof T> = Omit<T, K> & { [SubKey in K]?: Maybe<T[SubKey]> };
export type MakeMaybe<T, K extends keyof T> = Omit<T, K> & { [SubKey in K]: Maybe<T[SubKey]> };
export type BlogPostsQuery = { __typename?: 'Query', blogPost?: Array<{ __typename?: 'BlogPost', path: string, subtitle?: string | null, displayText?: string | null, owner: string, publishedUtc?: any | null, markdownBody?: { __typename?: 'MarkdownBodyPart', markdown?: string | null } | null, image?: { __typename?: 'MediaField', urls?: Array<string | null> | null } | null } | null> | null };
export type BlogPostsQueryVariables = Exact<{ [key: string]: never; }>;
@Injectable({
providedIn: 'root'
})
export class BlogPostsGQL extends Apollo.Query<BlogPostsQuery, BlogPostsQueryVariables> {
document = BlogPostsDocument;
constructor(apollo: Apollo.Apollo) {
super(apollo);
}
}
export const CurrentBlogDocument = gql`
query currentBlog($urlPath: String) {
blogPost(where: {path: $urlPath}) {
path
subtitle
displayText
owner
publishedUtc
image {
urls
}
markdownBody {
markdown
}
}
}
`;
The packages I use in this application are as below:我在这个应用程序中使用的包如下:
"@apollo/client": "^3.0.0",
"@graphql-codegen/cli": "^2.7.0",
"@graphql-codegen/introspection": "^2.1.1",
"@graphql-codegen/typescript": "^2.6.0",
"@graphql-codegen/typescript-apollo-angular": "^3.4.13",
"@graphql-codegen/typescript-operations": "^2.4.3",
"apollo-angular": "^3.0.1",
"graphql": "^16.5.0",
How can I get rid of these errors?我怎样才能摆脱这些错误?
Thanks!谢谢!
There is obvious type checking incoherence between the Blogposts type and re-affectation later in the code. Blogposts 类型和代码后面的重新影响之间存在明显的类型检查不一致。
use利用
$any((blogPosts | async)...
to avoid type-checking error without correcting the type incoherence.在不纠正类型不连贯的情况下避免类型检查错误。
As for the legibility of $any, here is what is in the doc :至于 $any 的易读性,这是文档中的内容:
Use the $any() type-cast function in certain contexts to opt out of type-checking for a part of the expression在某些上下文中使用 $any() 类型转换函数来选择不对表达式的一部分进行类型检查
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