续集：A未与B“ nodejs关联

如何解决续集：A未与B“ nodejs关联

我有两个模型，其中一个是Question，另一个是Answer，每个答案都有一个question_id，而一个问题可以有一个以上的答案。

我想在我的json响应中包含每个问题的所有答案，但我一直遇到错误

“邮件”：“答案与问题无关！” *

下面是问题模型：-

module.exports = (sequelize,Sequelize) => {
    const Question = sequelize.define("question",{
        question_id: {
            type: Sequelize.INTEGER,primaryKey: true,autoIncrement: true
        },question_no: {
            type: Sequelize.DOUBLE,allowNull: false
        },question_text: {
            type: Sequelize.STRING,question_required: {
            type: Sequelize.BOOLEAN,},formpage_no: {
            type: Sequelize.DOUBLE,med_id: {
            type: Sequelize.INTEGER,allowNull: false,references: {
                model: 'medforms',key: 'med_id'
            },onUpdate: 'CASCADE',onDelete: 'CASCADE'
        },med_name: {
            type: Sequelize.STRING,allowNull: true
        },version_no: {
            type: Sequelize.STRING,allowNull: false
        }
    },{
        freezeTableName: false,// true: if we want to make table name as we want else sequelize will make them prural
        underscored: true // underscored: true indicates the the column names of the database tables are snake_case rather than camelCase
    });
    Question.associate = function (models) {
        Question.hasMany(models.answer,{
            foreignKey: 'question_id',as: 'answers'
        });
        Question.hasMany(models.helpbox,as: 'helpboxes'
        });
        // in future each question could have more than one document text
    };
    return Question;
};

以下是我的答案模型：-

module.exports = (sequelize,Sequelize) => {
    const Answer = sequelize.define("answer",{
        answer_id: {
            type: Sequelize.INTEGER,question_id: { // each answer has one questionId
            type: Sequelize.INTEGER,references: {
                model: 'questions',key: 'question_id'
            },onDelete: 'CASCADE',answer_no: {
            type: Sequelize.DOUBLE,answer_text: {
            type: Sequelize.STRING,answer_icon: {
            type: Sequelize.STRING,answer_reply: {
            type: Sequelize.STRING,answer_logic: {
            type: Sequelize.STRING,// true: if we want to make table name as we want else sequelize will make them prural
        underscored: true // underscored: true indicates the the column names of the database tables are snake_case rather than camelCase
    });
    Answer.associate = function (models) {
        Answer.belongsTo(models.question,{
            as: 'questions'
        });
        // in future each question could have more than one document text
    };
    return Answer;
};

下面是index.js类：-

var Sequelize = require('sequelize');
var env = process.env.NODE_ENV || 'development';
var config = require("../config/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);
}

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

// Models
db.medform = require("./medform.model.js")(sequelize,Sequelize);
db.version = require("./version.model.js")(sequelize,Sequelize);
db.question = require("./question.model.js")(sequelize,Sequelize);
db.helpbox = require("./helpbox.model.js")(sequelize,Sequelize);
db.answer = require("./answer.model.js")(sequelize,Sequelize);
db.document = require("./document.model.js")(sequelize,Sequelize);


module.exports = db;

这是我的问题控制者

// Retrieve Question including answers from the database:
exports.getAllQuesData = (req,res) => {
    const version_no = req.query.version_no;
    const med_id = req.query.med_id;

    var condition = [{ "version_no": version_no },{ "med_id": med_id }];

    Question.findAll({
        include: [
            {
                model: answer,as: 'answers'
            }
        ],where: condition
    })
        .then(data => {
            res.send(data);
        })
        .catch(err => {
            res.status(500).send({
                message:
                    err.message || "Some error occurred while retrieving questions."
            });
        });
};

请帮助我我做错了，为什么我的协会不起作用

解决方法

您没有注册模型关联。看看我的answer如何做到

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