Implementation of search function of Sequelize - node.js

Question

Before the question, the post table of my current project has the following structure.
module.exports = class Post extends Model {
static init(sequelize) {
return super.init({
title: {
type: DataTypes.TEXT,
allowNull: false,
},
desc: {
type: DataTypes.TEXT,
},
ingredient: {
type: DataTypes.TEXT,
allowNull: false,
},
recipes: {
type: DataTypes.TEXT,
allowNull: false,
},
tips: {
type: DataTypes.TEXT,
},
tags: {
type: DataTypes.TEXT,
},
}, {
modelName: 'Post',
tableName: 'posts',
charset: 'utf8mb4',
collate: 'utf8mb4_general_ci',
sequelize,
});
}
static associate(db) {
db.Post.belongsTo(db.User);
db.Post.belongsToMany(db.Hashtag, { through: 'PostHashtag' });
db.Post.hasMany(db.Comment);
db.Post.hasMany(db.Image);
db.Post.belongsToMany(db.User, { through: 'Like', as: 'Likers' });
}
};
I implemented the hashtag post search function using the following router.
router.get('/:tag', async (req, res, next) => {/hashtag/1
try {
const where = {};
if (parseInt(req.query.lastId, 10)) {
where.id = { [Op.lt]: parseInt(req.query.lastId, 10)};
}
const posts = await Post.findAll({
where,
limit: 10,
order: [['createdAt', 'DESC']],
include: [{
model: Hashtag,
where: { name: decodeURIComponent(req.params.tag) },
}, {
model: User,
attributes: ['id', 'nickname'],
}, {
model: User,
as: 'Likers',
attributes: ['id'],
}, {
model: Comment,
include: [{
model: User,
attributes: ['id', 'nickname'],
}],
}, {
model: Image,
}]
});
res.status(200).json(posts);
} catch (error) {
console.error(error);
next(error);
}
});
The execution result was successful, and I was able to get the results I wanted.
However, we thought that it was not enough to search only hashtags, so we added the following conditions to additionally search the title and contents of the post.
router.get('/:tag', async (req, res, next) => {
try {
const where = {
title: { [Op.like]: "%" + decodeURIComponent(req.params.tag) + "%" }, // Search for the title of a post
recipes: { [Op.like]: "%" + decodeURIComponent(req.params.tag) + "%" }, // Search the content of the post
};
if (parseInt(req.query.lastId, 10)) {
where.id = { [Op.lt]: parseInt(req.query.lastId, 10)};
}
const posts = await Post.findAll({
where,
limit: 10,
:
:
After that, the result of running the code did not load any posts, contrary to what I expected.
What part should be modified to implement a search function that includes the title, content, and hashtag of a post?

Answer 1

I guess the problem with your function is that you are using where with AND
instead of OR.
Post.findAll({
where: {
[Op.and]:
[{ title: {[Op.like]...} },
{ recipes: {[Op.like]...} }], // (title= %S) AND (recipes = %S)
...
)}
// that is the same as your example
const where = {
// Search for the title of a post
title: { [Op.like]: "%"...,
// Search the content of the post
recipes: { [Op.like]: "%"... },
};
// this is an AND operation
What you should do is use OR. More info: operators
[Op.or]: [{ a: 5 }, { b: 6 }], // (a = 5) OR (b = 6)
In your case:
Post.findAll({
where: {
[Op.or]:
[{ title: {[Op.like]...} },
{ recipes: {[Op.like]...} }], // (title= %S) AND (recipes = %S)
...
)}
That is also not the proper way of searching. Maybe you should consider looking for full-text search implementations like Elastic Search or look if the database you are using has this feature built-in.