i am a fresher i need help on nodejs - mysql

Question

i have three tables (questions , options , answers)
in these three table parent model is questions and then child is options and answers
so, i want to delete child data also calling by parent id
Here is questions models
import Sequelize from "sequelize";
import Exam from "../../models/exam.js";
import sequelize from "../../utilities/database.js";
const Question = sequelize.define("question", {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
allowNull: false,
primaryKey: true,
},
questiontext: {
type: Sequelize.STRING,
allowNull: true,
},
questiontexthindi: {
type: Sequelize.STRING,
allowNull: true,
},
questionImgURL: {
type: Sequelize.STRING,
allowNull: true,
},
description: {
type: Sequelize.TEXT,
allowNull: true,
},
examId: {
type: Sequelize.INTEGER,
allowNull: false,
references: {
model: Exam,
key: "id",
},
},
isActive: {
type: Sequelize.BOOLEAN,
defaultValue: true,
},
});
export default Question;
options models
import Sequelize from "sequelize";
import sequelize from "../../utilities/database.js";
import Question from "./question.js";
const Option = sequelize.define("option", {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
allowNull: false,
primaryKey: true,
},
optiontext: {
type: Sequelize.STRING,
// (Sequelize.STRING),
allowNull: false,
isLength: [2, 6],
},
questionId: {
type: Sequelize.INTEGER,
allowNull: false,
references: {
model: Question,
key: "id",
onDelete: "CASCADE",
},
},
isActive: {
type: Sequelize.BOOLEAN,
defaultValue: true,
},
});
export default Option;
Here is answers models
import Sequelize from "sequelize";
import sequelize from "../../utilities/database.js";
import Question from "./question.js";
import Option from "./option.js";
const Answer = sequelize.define("answer", {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
allowNull: false,
primaryKey: true,
},
questionId: {
type: Sequelize.INTEGER,
allowNull: false,
references: {
model: Question,
key: "id",
onDelete: "CASCADE",
},
},
optionId: {
type: Sequelize.INTEGER,
allowNull: true,
references: {
model: Option,
key: "id",
},
},
correctanswer: {
type: Sequelize.STRING,
allowNull: false,
},
isActive: {
type: Sequelize.BOOLEAN,
defaultValue: true,
},
});
export default Answer;
Here is my controller
//models
import Question from "../../../models/model-tesportal/option.js";
//helpers
import { validationErrorHandler } from "../../../helpers/validation-error-handler.js";
export const deleteTestSeries = async (req, res, next) => {
validationErrorHandler(req, next);
const questionId = req.params.questionId;
try {
const result = await Question.destroy({
where: {
questionId: questionId,
},
});
if (result[0] === 0) {
const error = new Error("Question not found");
error.statusCode = 404;
return next(error);
}
res.status(201).json({
message: "Question Deleted successfully",
});
} catch (err) {
if (!err.statusCode) {
err.statusCode = 500;
}
next(err);
}
};
i want to pass questionId in params and then delete data of that particular questionId will be deleted from parent and child tables

Answer 1

I got the solution from #geeks for geeks
i have to modify in my models where i wanna access those reference key Id
just look at my models now it works perfectly :
here is questions model {parent}
import Sequelize from "sequelize";
import Exam from "../../models/exam.js";
import sequelize from "../../utilities/database.js";
const Question = sequelize.define("question", {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
allowNull: false,
primaryKey: "id", **<----- modify here**
},
questiontext: {
type: Sequelize.STRING,
allowNull: true,
},
questiontexthindi: {
type: Sequelize.STRING,
allowNull: true,
},
questionImgURL: {
type: Sequelize.STRING,
allowNull: true,
},
description: {
type: Sequelize.TEXT,
allowNull: true,
},
examId: {
type: Sequelize.INTEGER,
allowNull: false,
references: {
model: Exam,
key: "id",
},
},
isActive: {
type: Sequelize.BOOLEAN,
defaultValue: true,
},
});
export default Question;
child - options model
import Sequelize from "sequelize";
import sequelize from "../../utilities/database.js";
import Question from "./question.js";
const Option = sequelize.define("option", {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
allowNull: false,
primaryKey: true,
},
optiontext: {
type: Sequelize.STRING,
// (Sequelize.STRING),
allowNull: false,
isLength: [2, 6],
},
questionId: {
type: Sequelize.INTEGER,
allowNull: false,
onDelete: "CASCADE", **<----- modify here**
references: {
model: Question,
key: "id",
FOREIGNKEY: "id", **<----- modify here**
},
},
isActive: {
type: Sequelize.BOOLEAN,
defaultValue: true,
},
});
export default Option;
child - answers models
import Sequelize from "sequelize";
import sequelize from "../../utilities/database.js";
import Question from "./question.js";
import Option from "./option.js";
const Answer = sequelize.define("answer", {
id: {
type: Sequelize.INTEGER,
autoIncrement: true,
allowNull: false,
primaryKey: true,
},
questionId: {
type: Sequelize.INTEGER,
allowNull: false,
onDelete: "CASCADE", **<----- modify here**
references: {
model: Question,
key: "id",
FOREIGNKEY: "id", **<----- modify here**
},
},
optionId: {
type: Sequelize.INTEGER,
allowNull: true,
references: {
model: Option,
key: "id",
},
},
correctanswer: {
type: Sequelize.STRING,
allowNull: false,
},
isActive: {
type: Sequelize.BOOLEAN,
defaultValue: true,
},
});
export default Answer;
main code controller
//models
import Question from "../../../models/model-tesportal/question.js";
//helpers
import { validationErrorHandler } from "../../../helpers/validation-error-handler.js";
export const deleteTestSeries = async (req, res, next) => {
validationErrorHandler(req, next);
try {
const result = await Question.destroy({
where: {
id: req.params.questionId,
},
});
if (result[0] === 0) {
const error = new Error("Question not found");
error.statusCode = 404;
return next(error);
}
res.status(201).json({
message: "Hey Admin Question Deleted successfully",
});
} catch (err) {
if (!err.statusCode) {
err.statusCode = 500;
}
next(err);
}
};