Question

我试图使用Mongoose在MongoDB中保存一个保存，但我得到的代码不起作用，所以我谷歌那个，我找到了一个有效的解决方案，但是tyescript一直告诉我，有一个错误。

但代码实际上有效。

这是不起作用的代码，但根据打字稿，没关系：

userSchema.static('createUser', (user: IUser, callback: Function) => {
    bcrypt.genSalt(10, (err, salt) => {
        bcrypt.hash(user.password, salt, (err, hash) => {
            if(err) throw err;
            user.password = hash;
            user.save({}, (err, doc) => callback);
        });
    });
});

这是正在运行的代码，但是typescriot向我显示了一个我无法用tsc编译的错误（我可以用gulp构建来完成）

userSchema.static('createUser', (user: IUser, callback: Function) => {
    bcrypt.genSalt(10, (err, salt) => {
        bcrypt.hash(user.password, salt, (err, hash) => {
            if(err) throw err;
            user.password = hash;
            user.save(callback);
        });
    });
});

请注意保存功能。在这里你有图像。

使用第一个选项时，问题是保存中没有触发回调。

这是我的package.json

{
  "name": "sss",
  "version": "1.0.0",
  "description": "Example App uses TypeScript, Node.js, Express 4, MongoDB, Mongoose.",
  "main": "index.js",
  "dependencies": {
    "bcryptjs": "^2.4.3",
    "body-parser": "^1.17.2",
    "debug": "^2.6.8",
    "dotenv": "^2.0.0",
    "express": "^4.15.3",
    "iconv-lite": "^0.4.17",
    "inversify": "^4.11.1",
    "jsonwebtoken": "^7.4.1",
    "mongoose": "^5.0.10",
    "morgan": "^1.8.2",
    "passport": "^0.3.2",
    "passport-jwt": "^2.2.1",
    "rxjs": "^5.4.2",
    "typescript": "^2.7.2",
    "winston": "^2.3.1"
  },
  "devDependencies": {
    "@types/chai": "^4.0.0",
    "@types/debug": "0.0.29",
    "@types/dotenv": "^2.0.20",
    "@types/express": "^4.0.35",
    "@types/mocha": "^2.2.41",
    "@types/mongoose": "^4.7.15",
    "@types/morgan": "^1.7.32",
    "@types/node": "^6.0.77",
    "@types/passport": "^0.3.3",
    "@types/passport-jwt": "^2.0.20",
    "chai": "^4.0.2",
    "chai-http": "^3.0.0",
    "gulp": "^3.9.1",
    "gulp-clean": "^0.3.2",
    "gulp-typescript": "^3.1.7",
    "gulp-yaml": "^1.0.1",
    "mocha": "^3.4.2",
    "mocha-typescript": "^1.1.4"
  },
  "scripts": {
    "start": "tsc && nodemon src/index.ts",
    "build": "gulp build",
    "test": "tsc && mocha -t 30000 dist/**/*.test.js"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/devslaw/TypeScript-Node.js-REST-example.git"
  },
  "keywords": [],
  "author": "Arthur Arakelyan <arthur@devslaw.com>",
  "license": "ISC",
  "homepage": "https://github.com/devslaw/TypeScript-Node.js-REST-example#readme"
}

---更新---

IUSER

import {Schema, Model, Document, model} from 'mongoose';
import * as bcrypt from 'bcryptjs';

export interface IUser extends Document {
    name: string;
    email: string;
    password: string;
}

export interface IUserModel {
    createUser(user: IUser, callback: Function): void
    comparePassword(candidatePassword: string, hash: string, callback: Function): void
    findByEmail(email: string, callback: Function): void
}

const userSchema = new Schema({
    name: {
        type: String,
        required: true
    },
    email: {
        type: String,
        required: true
    },
    password: {
        type: String,
        required: true
    },
    createAt: {
        type: Date,
        "default": Date.now()
    },
    updatedAt: {
        type: Date,
        "default": Date.now()
    }
});

userSchema.static('createUser', (user: IUser, callback: Function) => {
    bcrypt.genSalt(10, (err, salt) => {
        bcrypt.hash(user.password, salt, (err, hash) => {
            if(err) throw err;
            user.password = hash;
            user.save(callback);
        });
    });
});

userSchema.static('comparePassword', (candidatePassword: string, hash: string, callback: Function) => {
    bcrypt.compare(candidatePassword, hash, (err, isMatch) => {
        if(err) throw err;
        callback(null, isMatch);
    });
});

userSchema.static('findByEmail', (email: string, callback: Function) => {
    User.findOne({email: email}, callback);
});

export type UserModel = Model<IUser> & IUserModel & IUser;

export const User: UserModel = <UserModel>model<IUser>("User", userSchema);

错误是：

src/shared/models/user.ts(44,23): error TS2345: Argument of type 'Function' is not assignable to parameter of type '(err: any, product: IUser, numAffected: number) => void'.
  Type 'Function' provides no match for the signature '(err: any, product: IUser, numAffected: number): void'.

Answer 1

根据您获得的错误，user.save方法预计会收到类型为的回调：

(err: any, product: IUser, numAffected: number) => void

由于Function类型非常宽泛并且基本上包含任何可调用类型，因此无法保证Function的某些内容会接受上面较窄类型中列出的参数。

要解决此问题，您应该将callback参数限制为较窄的类型。当您将错误传递给user.save时，这将删除错误，并确保您向createUser提供的任何回调都是正确的形式（因为目前您可以将任何函数传递给它，即使它＆＃39;不是正确的类型。）

因此，对于您的代码段，请更改以下行：

userSchema.static('createUser', (user: IUser, callback: Function) => {

到

userSchema.static('createUser', (user: IUser, callback: (err: any, product: IUser, numAffected: number) => void) => {

这样回调就是更具体的类型。

打字稿找不到有错误的地方

1 个答案: