Question

我不确定实例是否被正确创建，但是我的模型似乎未定义。这是我的代码设置方式：

db.js

const fs = require("fs");
const path = require("path");
const Sequelize = require("sequelize");
const basename = path.basename(module.filename);
const env = process.env.NODE_ENV || "development";
const config = require(__dirname + "/config.js")[env];
const db = {};

if (config.use_env_variable) {
  var sequelize = new Sequelize(process.env[config.use_env_variable]);
} else {
  var sequelize = new Sequelize(
    config.database,
    config.username,
    config.password,
    config
  );
}

fs.readdirSync(path.join(__dirname, "models"))
  .filter(function(file) {
    return (
      file.indexOf(".") !== 0 && file !== basename && file.slice(-3) === ".js"
    );
  })
  .forEach(function(file) {
    let model = sequelize["import"](path.join(__dirname, "models", file));
    db[model.name] = model;
  });

Object.keys(db).forEach(function(modelName) {
  if (db[modelName].associate) {
    db[modelName].associate(db);
  }
});

sequelize
  .authenticate()
  .then(() => {
    console.log(`Connection was successful!`);
  })
  .catch(err => {
    console.log(`Unable to connect to database: ${err}`);
  });

db.sequelize = sequelize;
db.Sequelize = Sequelize;

module.exports = {
  db
};

Manifest.js（在models文件夹中）

"use strict";

module.exports = function(sequelize, DataTypes) {
  let Manifest = sequelize.define("Manifest", {
    manifestNumber: {
      type: DataTypes.STRING(10),
      primaryKey: true,
      allowNull: false
    },
    huller: DataTypes.STRING(50),
    address: DataTypes.STRING(50),
    carrier: DataTypes.STRING(50),
    driver: DataTypes.STRING(50),
    dateShipped: DataTypes.DATE,
    preparedBy: DataTypes.STRING(15),
    recievedBy: DataTypes.STRING(15),
    truckLicenseNumber: DataTypes.STRING(25),
    frontTrailerLicenseNumber: DataTypes.STRING(25),
    rearTrailerLicenseNUmber: DataTypes.STRING(25),
    splitLoad: DataTypes.BOOLEAN,
    tagNumber: DataTypes.STRING(50),
    grossTotal: DataTypes.DECIMAL(18, 0),
    netTotal: DataTypes.DECIMAL(18, 0),
    totalBins: DataTypes.DECIMAL(18, 0),
    phase: DataTypes.STRING(10),
    shipments: DataTypes.INTEGER,
    submitDate: { 
      type: DataTypes.DATEONLY, 
      defaultValue: DataTypes.NOW,
      allowNull: false 
    }
  });

  return Manifest;
};

api.js（摘要）

const db = require("../db");
const express = require("express");
const router = express.Router();

router.post("/manifests/new", function(req, res) {
  let manifest = req.body;

  db.Manifest.max("manifestNumber")
    .success(max => {
      if (max) {
      // Convert max to int, add 1, then post with new manifest
      } else {
      // Empty table so start with 1
      }
    })
    .error(err => {
      console.log(`Error querying max: ${err}`);
    });
})

我确保文件名与模型中定义的完全匹配，但是当我的db.js读取models目录并将其添加到db变量时，我不确定这是否重要。是将代码包含在api.js中时，是代码的结构方式还是滥用db？我知道这段代码可以正确连接到我的SQL Server实例，但是这可能是该模型没有正确链接到现有表吗？还是表此时恰好是空的？此Sequelize新手将不胜感激！

Answer 1

在Sequelize中，您不需要将所有模型放入变量中... 当您自动使用sequelize.import时，您将拥有sequelize.models（从模型文件夹中导入的所有模型的数组）和sequelize.model函数，并且您必须使用以下内容：sequelize.model('Manifest')

db.js

const Sequelize = require('sequelize')
const fs = require('fs')
const path = require('path')

module.exports = ({ logger, config }) => {
  config.db.logging = (
    config.db.logging !== false
      ? query => logger.debug('[DATABASE]', query)
      : false
  )

  const db = new Sequelize(config.db)

  loadModels(db)

  Object
    .keys(db.models)
    .forEach((model) => {
      if ('associate' in db.model(model)) {
        db.model(model).associate()
      }
    })

  return db
}

// ===============================================

function loadModels (sequelize) {
  const dir = path.join(__dirname, 'models')
  fs.readdirSync(dir)
    .forEach(
      file => sequelize.import(path.join(dir, file))
    )
}

我在loadModels函数中没有任何一致性，因为model文件夹中的所有文件都必须导出序列化模型。

关于您的错误。检查您的Object.keys(db)是否确实有您的模型，因为您的readdirSync似乎是错误的。所以检查一下。

Sequelize TypeError：无法读取未定义的属性“ max”

1 个答案: