我目前正在开发一个 NestJS 项目,其中我必须将大量数据存储在单个数据库表中。
因此,我创建了一个实体、一个存储库、一个 dto 和一个路由来存储所有内容。我的 dto 就像我的实体一样非常长并且包含很多我必须存储的变量。
我的 dto 中的几乎每个变量都是可选的,并且在实体中所有内容都可以为空,因此我必须在为其创建数据集之前验证该值是否存在。
我的实体:
import { Column, Entity, PrimaryGeneratedColumn } from 'typeorm';
import { distributionSponsors } from '../enums/distributionSponsors';
import { fbw } from '../enums/fbw';
import { MovieFskHf } from '../enums/movieFskHf';
import { MovieFskTr } from '../enums/movieFskTr';
import { MovieGenre } from '../enums/movieGenre';
@Entity()
export class Movie {
@PrimaryGeneratedColumn()
id: number;
@Column({ nullable: true })
isPublished: boolean;
@Column({ nullable: true })
cinemaRelease: Date;
...// more following the same format
}
import { ParseIntPipe } from '@nestjs/common';
import { ApiProperty } from '@nestjs/swagger';
import { Type } from 'class-transformer';
import { IsOptional, IsString } from 'class-validator';
import { distributionSponsors } from '../enums/distributionSponsors';
import { fbw } from '../enums/fbw';
import { MovieFskHf } from '../enums/movieFskHf';
import { MovieFskTr } from '../enums/movieFskTr';
import { MovieGenre } from '../enums/movieGenre';
export class CreateMovieDto {
@ApiProperty()
@IsOptional()
isPublished: boolean;
@ApiProperty()
@IsOptional()
cinemaRelease: Date;
... // more following the same format
}
现在在我的存储库中,我正在解构 dto。我不想将来自 dto 的每个变量包装到 if 语句中。有没有一种更简单的方法可以更紧凑地编写所有内容?
@EntityRepository(Movie)
export class MoviesRepository extends Repository<Movie> {
async createMovie(
createMovieDto: CreateMovieDto,
) {
const movie = this.create();
const {
isPublished,
cinemaRelease,
title,
orgTitle,
...//more following
} = createMovieDto;
/* need logic here to do something like
* if(title){
* movie.title = title
* }
* just for every single variable from the dto
*/
try {
await this.save(movie);
} catch (error) {
//blah
}
}
您可以检查 DTO 对象并删除空属性:解决方案如下:
async createMovie(
createMovieDto: CreateMovieDto,
) {
Object.keys(createMovieDto).forEach(
k =>
createMovieDto[k] == null ||
(createMovieDto[k] == '' && delete createMovieDto[k]),
);
try {
await this.save(createMovieDto);
} catch (error) {
//blah
}
}