Mysql 如何执行Sequelize连接
我有一个运行在nodejs中的Express应用程序,并使用Sequelize处理MySQL数据库。在我的数据库逻辑中,聊天室和用户聊天室之间有一对多的关系。当我尝试使用以下代码执行连接时:Mysql 如何执行Sequelize连接,mysql,node.js,express,sequelize.js,Mysql,Node.js,Express,Sequelize.js,我有一个运行在nodejs中的Express应用程序,并使用Sequelize处理MySQL数据库。在我的数据库逻辑中,聊天室和用户聊天室之间有一对多的关系。当我尝试使用以下代码执行连接时: var userId = 1; db.ChatRoom.findAll({ include: [{ model: db.UserChatRoom, where: { ucrIdChatUser:user
var userId = 1;
db.ChatRoom.findAll({ include: [{
model: db.UserChatRoom,
where: {
ucrIdChatUser:userId
},
required: false
}]})
我在控制台上收到以下错误消息:
Unhandled rejection Error: UserChatRoom is not associated to ChatRoom!
at validateIncludedElement
我想让加入查询工作,并将感谢帮助。我尝试在index.js的末尾强制执行关联。当应用程序启动并从Sequalize网站获取时,此脚本将加载此文件夹中的模型
注意:UserChatRoom.ucrIdChatRoom是UserChat.idChatRoom的外键
型号:
module.exports = function(sequelize, DataType){
var ChatRoom = sequelize.define("ChatRoom",{
idChatUser: {
type: DataType.INTEGER,
autoIncrement: true,
primaryKey: true
},
crName: {
type: DataType.STRING,
allowNull: false
},
crDateInserted: {
type: DataType.DATE
},
crDateUpdated: {
type: DataType.DATE
},
crIsOpen: {
type: DataType.INTEGER,
defaultValue: 0
}
})
return ChatRoom;
}
及
index.js:
您必须从两个方面定义关系。用户聊天室有一个聊天室,聊天室属于用户聊天室。此外,您的关系应该放在每个模型中,而不是索引中
module.exports = function(sequelize, DataType){
var ChatRoom = sequelize.define("ChatRoom",{
idChatUser: {
type: DataType.INTEGER,
autoIncrement: true,
primaryKey: true
},
//etc
}, {
classMethods: {
//models/index.js calls this function
associate: function(models) {
ChatRoom.belongsTo(UserCharRoom, {foreignKey: 'something'});
}
}
})
return ChatRoom;
}
"use strict";
var fs = require("fs");
var path = require("path");
var Sequelize = require("sequelize");
var env = process.env.NODE_ENV || "development";
var config = require(path.join(__dirname, '..', 'config', 'config.json'))[env];
if (process.env.DATABASE_URL) {
var sequelize = new Sequelize(process.env.DATABASE_URL,config);
} else {
var sequelize = new Sequelize(config.database, config.username, config.password, config);
}
var db = {};
fs
.readdirSync(__dirname)
.filter(function(file) {
return (file.indexOf(".") !== 0) && (file !== "index.js") && (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 ("associate" in db[modelName]) {
db[modelName].associate(db);
}
});
db.sequelize = sequelize;
db.Sequelize = Sequelize;
db.UserChatRoom.hasOne(db.ChatUser);
db.UserChatRoom.hasOne(db.ChatRoom, { foreignKey: 'ucrIdChatRoom' , foreignKeyConstraint:true });
db.ChatUser.belongsTo(db.UserChatRoom, { foreignKey: 'ucrIdChatRoom' , foreignKeyConstraint:true});
db.ChatRoomMessage.hasOne(db.UserChatRoom, { foreignKey: 'crmIdUserChatRoom' , foreignKeyConstraint:true });
module.exports = db;
module.exports = function(sequelize, DataType){
var ChatRoom = sequelize.define("ChatRoom",{
idChatUser: {
type: DataType.INTEGER,
autoIncrement: true,
primaryKey: true
},
//etc
}, {
classMethods: {
//models/index.js calls this function
associate: function(models) {
ChatRoom.belongsTo(UserCharRoom, {foreignKey: 'something'});
}
}
})
return ChatRoom;
}