Question

在我的Node JS / Express中，我试图使用以下代码查询ID：


router.get('/module/:id/',  (req, res ) => {
    try {
        console.log('in get module')
        const luamodule =  LuaModule.findById('5eb2818c955bc7202498cd09')
        console.log('module name is ' + luamodule.name)
    } catch (error) {
        console.log('In error --> ' + error)
        res.status(404).send(error.Message)
    }
})

尽管记录存在ID-5eb2818c955bc7202498cd09，该函数不会返回记录。

console.log输出“模块名称未定义”作为输出。

在models目录中遵循luamodule.js

const validator = require('validator')

const luaModuleSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true,
        trim: true
    },
    email: {
        type: String,
        // unique: true,
        required: true,
        trim: true,
        lowercase: true,
        validate(value) {
            if (!validator.isEmail(value)) {
                throw new Error('Email is invalid')
            }
        }
    },
    environment: {
        type: String,
        required: true,
        trim: true,

    },
    description: {
        type: String,
        required: true,
        trim: true,

    },
    modulefile: {
        type: Buffer
    },

})

const luaModule = mongoose.model('LuaModule', luaModuleSchema)

module.exports = luaModule ```

End objective of  the exercise is to accept the parameters from client and return the zip file stored into database.

Appreciate any help in  this regard.

Answer 1

node.js是异步的，此LuaModule.findById('5eb2818c955bc7202498cd09')代码返回Promise对象。

您必须履行这一诺言才能取得结果，请尝试这种方式

router.get('/module/:id/', async (req, res ) => {
    try {
        console.log('in get module')
        const luamodule = await LuaModule.findById('5eb2818c955bc7202498cd09')
        console.log('module name is ' + luamodule.name)
    } catch (error) {
        console.log('In error --> ' + error)
        res.status(404).send(error.Message)
    }
})

Answer 2

您可以遵循此代码

型号

const validator = require('validator')

const luaModuleSchema = new mongoose.Schema({
    name: {
        type: String,
        required: true,
        trim: true
    },
    email: {
        type: String,
        // unique: true,
        required: true,
        trim: true,
        lowercase: true,
        validate(value) {
            if (!validator.isEmail(value)) {
                throw new Error('Email is invalid')
            }
        }
    },
    environment: {
        type: String,
        required: true,
        trim: true,

    },
    description: {
        type: String,
        required: true,
        trim: true,

    },
    modulefile: {
        type: Buffer
    },

})

const LuaModule = mongoose.model('LuaModule', luaModuleSchema)

module.exports = LuaModule

> Controller

router.get('/module/:id/', async (req, res ) => {
    try {
        console.log('in get module')
        const luamodule =await LuaModule.findById('5eb2818c955bc7202498cd09')
        console.log('module name is ' + luamodule.name)
    } catch (error) {
        console.log('In error --> ' + error)
        res.status(404).send(error.Message)
    }
})

节点JS /猫鼬-model.findbyID虽然存在但未返回记录

2 个答案: