Regular expression filter for MERN stack search boxes and checkboxes
P粉302160436
P粉302160436 2024-04-06 14:53:12
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I'm trying to learn how the MERN stack works together by learning by doing, and I'm following these tutorials for bezcoder: Node.js/Express/MongoDb (Github Entire Code) and Reactjs (Github Entire Code)

Sample data from server

[
  {
    "id": "5f9bdace778082303c859248",
    "title": "How to cook noodles",
    "description": "This is a tutorial about how to cook noodles in under 10 minutes.",
    "published": false
  },
  {
    "id": "5f9bdae3778082303c859249",
    "title": "How to bake a chocolate cake",
    "description": "This is a tutorial about how to bake chocolate cake using cocoa powder.",
    "published": true
  }
]

status quo Currently, the frontend of the app has a search bar where I can search and filter the data by the "title" of the tutorial (e.g. "Noodles" to get the first one). I found that this is done with the following code snippet:

  1. tutorial.controller.js
exports.findAll = (req, res) => {
  const title = req.query.title;
  var condition = title ? { title: { $regex: new RegExp(title), $options: "i" } } : {};

  Tutorial.find(condition)
    .then(data => {
      res.send(data);
    })
    .catch(err => {
      res.status(500).send({
        message:
          err.message || "Some error occurred while retrieving tutorials."
      });
    });
};
  1. services/tutorial.service.js (in Reactjs)
import http from "../http-common";

class TutorialDataService {

...
  
  findByTitle(title) {
    return http.get(`/tutorials?title=${title}`);
  }
}

export default new TutorialDataService();

What I want to know is,, how do I change these codes so that I can filter by words in the search box "title" and "description" and the published:true pass checkbox.

If the front end looks like this:

My attempt

  1. tutorial.controller.js
exports.findAll = (req, res) => {
  const title = req.query.title || "";
  const description = req.query.description || "";
  const published = req.query.published;

  Tutorial.find(
    {
    $or: [
        {title: { $regex: new RegExp(title), $options: "i"}}, {description: { $regex: new RegExp(description), $options: "i"}}
    ],
    $and: [
        .... and here if checked, then only show published, else show all ....
    ]

}

  )
    .then(data => {
      res.send(data);
    })
    .catch(err => {
      res.status(500).send({
        message:
          err.message || "Some error occurred while retrieving tutorials."
      });
    });
};
  1. services/tutorial.service.js (in Reactjs)
import http from "../http-common";

class TutorialDataService {

...
  
  findByTitle(title, description, published) {
    return http.get(`/tutorials?title=${title}`, `/tutorials?description=${description}`, `/tutorials?published=${published}`);
  }
}

export default new TutorialDataService();

I'm not sure if this is the correct usage of findByTitle and how to implement the OR and AND functions correctly.

P粉302160436
P粉302160436

reply all(1)
P粉792673958

The code in your { has an error in the tutorial find query. $or Each query requires a separate { }. Use it like below. It will work. Used to search within title, description, and published checkboxes.

Tutorial.find:({
$or: [
        {title: { $regex: new RegExp(title), $options: "i"},
        {description: { $regex: new RegExp(description), $options: "i"}
    ],
published:true
})
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