Why MYSQL column values gets modified/deleted issue? - mysql

Question

I am building a React Nativeapp with MYSQL as the dabase and I am using SequelizeORM on Node.js. The problem is that I have a table called Like and there is a column field called userId and I simply store the ID of the users there. But the userId field gets cleared randomly. Like when I am restarting the database, or when there is an error and I need to restart the database or I am restarting the Android Emulator.
Here is how it looks:
CreateLikeModel.init({
id:{
type: DataTypes.INTEGER,
autoIncrement: true,
primaryKey: true,
allowNull: false,
},
userId:{
type: DataTypes.STRING,
allowNull: true
},
food_Name:{
type: DataTypes.STRING,
allowNull: false
},
food_id:{
type: DataTypes.INTEGER,
allowNull: false
}
},
And this is part of the function that saves the user Id when the user carry's out a like functionality:
const user = await CreateCustomer.findOne({where: {id: req.user.id}});
const likeObj ={
user_Id: user?.dataValues?.id?.toString(),
food_Name: food?.dataValues?.food_Name,
food_id: food.dataValues.id as number
}
//check if this user has liked this food
const checkUser = checkLike.find((single)=> single?.dataValues.userId ==
user.dataValues.id);
if(checkUser){
const getLike = await CreateLikeModel.findOne({where: {food_Name:
food.dataValues.food_Name, userId: user?.dataValues.id}});
await getLike?.destroy();//delete the like from the record if the user already liked;
return res.status(200).json('unliked');
}
await CreateLikeModel.create({...likeObj});
return res.status(200).json('liked');
And I connected to the database like this:
sequelizeDB.sync({alter: true}).then(()=>{
console.log('connected to datatbase')
})
I tried the save the userId as a string because it was a number before. Initially, when I used number, it usually reset the userId values to 0.
It still didn't solve the problem.
This was not happening before when I was using user_name instead of userId. What could be causing the issue? For now, I usually manually input the values back in the database when they get deleted.

Answer 1

Inside of likeObj, which you are using as the creation attributes for your like object, you have your User ID field as snake case user_Id, which in your model, I see it in camelCase userId.
I suspect this is the root of why it isn't populating the data correctly, however keep in mind that .sync({ alter: true }) can be a destructive operation, as state in the Sequelize documentation.