javascript - 环回错误: Model not found: Book : When I try to run after creating a new model using command

Question

当通过生成slc Loopback:model book创建一个新模型时， 当我尝试运行 app 时，出现以下错误

> Error: Model not found: Book at Function.registry.getModel
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback/lib/registry.js:273:9)
> at
> /home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/lib/executor.js:156:28
> at Array.forEach (native) at defineModels
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/lib/executor.js:151:23)
> at setupModels
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/lib/executor.js:140:3)
> at execute
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/lib/executor.js:28:3)
> at bootLoopBackApp
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/index.js:125:3)
> at Object.
> (/home/joseph/node_projects/laplace-master/enquete/server/server.coffee:24:1)
> at Object.
> (/home/joseph/node_projects/laplace-master/enquete/server/server.coffee:1:1)
> at Module._compile (module.js:409:26) at Object.loadFile
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/register.js:16:19)
> at Module.load
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/register.js:45:36)
> at Function.Module._load (module.js:300:12) at Module.require
> (module.js:353:17) at require (internal/module.js:12:17) at Object.
> (/home/joseph/node_projects/laplace-master/enquete/handlers/conditionchecker/brand_condition.coffee:5:7)
> at Object.
> (/home/joseph/node_projects/laplace-master/enquete/handlers/conditionchecker/brand_condition.coffee:1:1)
> at Module._compile (module.js:409:26) at Object.loadFile
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/register.js:16:19)
> at Module.load
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/register.js:45:36)
> at Function.Module._load (module.js:300:12) at Module.require
> (module.js:353:17) at require (internal/module.js:12:17) at Object.
> (/home/joseph/node_projects/laplace-master/enquete/common/models/question-group.js:13:3) at Module._compile (module.js:409:26) at Object.Module._extensions..js
> (module.js:416:10) at Module.load
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/register.js:45:36)
> at Function.Module._load (module.js:300:12) at Module.require
> (module.js:353:17) at require (internal/module.js:12:17) at
> /home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/lib/executor.js:170:20
> at Array.forEach (native) at defineModels
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/lib/executor.js:151:23)
> at setupModels
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/lib/executor.js:140:3)
> at execute
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/lib/executor.js:28:3)
> at bootLoopBackApp
> (/home/joseph/node_projects/laplace-master/enquete/node_modules/loopback-boot/index.js:125:3)
> at Object.
> (/home/joseph/node_projects/laplace-master/enquete/server/server.coffee:24:1)
> at Object.
> (/home/joseph/node_projects/laplace-master/enquete/server/server.coffee:1:1)
> at Module._compile (module.js:409:26) at Object.exports.run
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/coffee-script.js:154:23)
> at compileScript
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/command.js:224:29)
> at compilePath
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/command.js:174:14)
> at Object.exports.run
> (/usr/lib/node_modules/coffee-script/lib/coffee-script/command.js:98:20)
> at Object. (/usr/lib/node_modules/coffee-script/bin/coffee:7:41) at
> Module._compile (module.js:409:26) at Object.Module._extensions..js
> (module.js:416:10) at Module.load (module.js:343:32) at
> Function.Module._load (module.js:300:12) at Function.Module.runMain
> (module.js:441:10) at startup (node.js:139:18) at node.js:968:3

Here is my model class and configuration file.

book.js

module.exports = function(Book) {

};

book.json

{
  "name": "Book",
  "base": "PersistedModel",
  "idInjection": true,
  "options": {
    "validateUpsert": true
  },
  "properties": {
    "id": {
      "type": "string",
      "required": true,
      "default": "1"
    },
    "name": {
      "type": "string",
      "required": true,
      "default": "nil"
    }
  },
  "validations": [],
  "relations": {},
  "acls": [],
  "methods": {}
}

以及 server/model-config.json

{
  "_meta": {
    "sources": [
      "../common/models",
      "./models"
    ]
  },
  "User": {
    "dataSource": "db"
  },
  "AccessToken": {
    "dataSource": "mysql",
    "public": false
  },
  "ACL": {
    "dataSource": "mysql",
    "public": false
  },
  "RoleMapping": {
    "dataSource": "mysql",
    "public": false
  },
  "Role": {
    "dataSource": "mysql",
    "public": false
  },
  "Book": {
    "dataSource": "mysql",
    "public": false
  }
}

请帮助解决此问题。

Answer 1

我相信您可能尚未初始化数据源中的模型。

您需要在启动脚本中运行以下代码(例如，将代码保存到./server/boot/prepare-db.js。给它您想要的名称，但必须是在 ./server/boot 子文件夹内。)

module.exports = function prepareDB(app, cb) {
    var ds = app.dataSources.mysql;
    ds.automigrate(function() {
       console.log("MySQL db ready");
    });
}

automigrate 函数已记录 here .