使用 mwtsc 运行会导致 typegoose 的 InjectEntityModel 在有些情况下失效

[pecasha]

Describe the problem（描述问题）

在 middleware 中通过 requestContext 调用 service 时，InjectEntityModel 好像会注入失败导致 undefined

---

这个问题是我将 dev 启动换成 mwtsc 后出现的：

cross-env NODE_ENV=local mwtsc --watch --run @midwayjs/mock/app.js

如果换回之前的这个启动命令就会是正常的：

cross-env NODE_ENV=local midway-bin dev --ts

---

以下是代码片段

// log.service.ts
import { Provide, Inject } from "@midwayjs/core";
import { InjectEntityModel } from "@midwayjs/typegoose";
import { ReturnModelType } from "@typegoose/typegoose";
import { LogEntity } from "@/entity/log.entity";

@Provide()
export class LogService {
    @InjectEntityModel(LogEntity )
    private dbLog: ReturnModelType<typeof LogEntity >;

    public async add(log: LogAdminOperationEntity) {
        return await this.dbLog.create(log); // 在被调用时此处的 this.dbLog 会是 undefined
    }
}

// log.middleware.ts
import { Middleware, IMiddleware } from "@midwayjs/core";
import { NextFunction, Context } from "@midwayjs/koa";
import { LogService } from "@/service/log.service";

@Middleware()
export class LogMiddleware implements IMiddleware<Context, NextFunction> {
    resolve() {
        return async (ctx: Context, next: NextFunction) => {
            const logService = await ctx.requestContext.getAsync<LogService>(LogService);
            await logService.add({
                // xxxx
            });
        }
    }
}

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[waitingsong]

mwtsc 是编译功能，不能启动项目吧

[czy88840616]

mwtsc = tsc + (node app.js)

[czy88840616]

一般是不会的，注意你的 entity 扫描格式，编译后只会读取 js 文件了。

[pecasha]

我找到原因了，是数据源匹配的问题，src/config 配置文件中的 mongoose.dataSource.default.entities 我原先是配置的：

entities: [
    "**/*.entity.ts"
]

mwtsc是走编译的方式，这样会导致编译后找不到entity文件，只需要把配置改为这样就可以了：

entities: [
    "**/*.entity.{j,t}s"
]