Question

我尝试创建一个项目并使用node.js + sequelize，该项目有两个模型Fator和Sub_fator。他们有一个1：N的关联，但是当创建致命事件时，返回了错误：

错误：Fator.hasMany调用的不是Sequelize.Model的子类。

有任何建议可以解决该错误吗？

Fator模型

'use strict';
const Sub_Fator = require('./sub_fator');

module.exports = (sequelize, DataTypes) => {
  const Fator = sequelize.define('Fator', {
    descricao: DataTypes.STRING
  }, {});
  Fator.associate = function(models) {
      Fator.hasMany(Sub_Fator, {
      foreignKey: 'fatorId',
      as: 'fatores'
    });
  };
  return Fator;
};

模型Sub_fator

'use strict';
const Fator = require('./fator');

module.exports = (sequelize, DataTypes) => {
  const Sub_Fator = sequelize.define('Sub_Fator', {
    fatorId: DataTypes.INTEGER,
    descricao: DataTypes.STRING
  }, {});
  Sub_Fator.associate = function(models) {
    Sub_Fator.belongsTo(Fator, {
      foreignKey: 'fatorId',
      as: 'fatores'
    });
  };
  return Sub_Fator;
};

Answer 1

//Removed this import because is not an object of Model it's a definition
module.exports = (sequelize, DataTypes) => {
  const Fator = sequelize.define('Fator', {
    descricao: DataTypes.STRING
  }, {});
  Fator.associate = function(models) {
      Fator.hasMany(models.Sub_Fator, {//Change to this instead of Sub_Fator
        foreignKey: 'fatorId',
        as: 'fatores'
    });
  };
  return Fator;
};

原因是因为您在此处定义模型，但是随后在您的models / index.js或类似内容中将其导入以生成对象模型，这只是模型定义，而不是Sequelize的子类型号。

PS：如果您在项目中生成了续集，则索引应该是这样的：

'use strict';

var fs        = require('fs');
var path      = require('path');
var Sequelize = require('sequelize');
var basename  = path.basename(module.filename);
var env       = process.env.NODE_ENV || 'development';
var config    = require(__dirname + '/../config/server-config.json')[env];
var 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(__dirname)
  .filter(function(file) {
    return (file.indexOf('.') !== 0) && (file !== basename) && (file.slice(-3) === '.js');
  })
  .forEach(function(file) {
    var model = sequelize['import'](path.join(__dirname, file));
    db[model.name] = model;
  });

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

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

module.exports = db;

sequelize [erro] {this.name} .hasMany中的模型关联用不是Sequelize.Model

1 个答案: