node.js - 环回: How to access a model from a script?

Question

我正在使用 Loopback，并希望通过脚本将数据保存到数据库。

我编写了一个自定义命令，我将通过 cronjob 运行该命令:

'use strict';

var loopback = require('loopback');
var app = module.exports = loopback();
var boot = require('loopback-boot');

app.start = function() {
  return app.listen(function() {
    const baseUrl = app.get('url').replace(/\/$/, '');
    console.log('Web server listening at: %s', baseUrl);
    let Dish = app.models.dish;
    console.log(Dish);
  })
}

boot(app, __dirname, function(err) {
  if (err) throw err;

  // start the server if `$ node server.js`
  if (require.main === module)
    app.start();
});

我得到的输出是:

Web server listening at: http://localhost:3000
undefined

如何访问碟子模型？

Answer 1

您没有调用启动函数

https://github.com/strongloop/loopback-boot

The loopback-boot module initializes (bootstraps) a LoopBackapplication. Specifically, it:

Configures data-sources.

Defines custom models Configures models and attaches models to data-sources.

Configures application settings

Runs additional boot scripts, so you can put custom setup code in multiple small files instead of in the main application file.

您的服务器 js 可能包含与此类似的内容

var boot = require('loopback-boot');

app.start = function() {
    return app.listen(function() {
        const baseUrl = app.get('url').replace(/\/$/, '');
        console.log('Web server listening at: %s', baseUrl);
        if (app.get('loopback-component-explorer')) {
            const explorerPath = app.get('loopback-component-explorer').mountPath;
            console.log('Browse your REST API at %s%s', baseUrl, explorerPath);
        }
    })
}

boot(app, __dirname, function(err) {
  if (err) throw err;

  // start the server if `$ node server.js`
  if (require.main === module)
    app.start();
});

您需要这些来初始化应用程序。您也许可以只调用 boot 来逃脱，但我认为 app.start 是连接数据源的那个。