Making the advanced query filter with Eloquent Filter in Laravel
Tags: laravel, eloquent, mysql, php
Published: 2019-12-22 16:32:11

---
title: "Making the advanced query filter with Eloquent Filter in Laravel"
published: true
description: "eloquent filter is a package for making dynamic query eloquent by query string in laravel.You will forget the complexity of pages filter."
tags: laravel,eloquent,MySQL,PHP
cover_image: http://www.theinclusionsolution.me/wp-content/uploads/2019/07/Jenga.jpg
---

#Introduction

Have you ever experienced make an advanced search page in programming? if your answer is yes maybe you know this feature has many conditions to make a query database.Especially when you are using a relational DB as MySQL in your project at that time our task will getting hard. I was searching for it. Eventually, I found a clean way to implement this feature in the Laravel project.

##What's the main problem?

The main problem is that you will make many conditions for every situation. Writing a lot of terms will surely reduce the readability of your code and increase the possibility of make a mistake.
Practical example:
Suppose we want to get the list of the users with the requested parameters as follows:

```
http://localhost:8000/users/search?age_more_than=25&gender=male&created_at=25-09-2019
```
The Request parameter will be as follows:
```
[ 
  'age_more_than' => '24',
  'gender' => 'male',
  'created_at' => '25-09-2019',
]
```
Implement this feature in `UsersController.php`

{% gist https://gist.github.com/mehdi-fathi/fb03bf7eb1f817aecb06c1a61f9ff221 %}

We check out a condition for each request.

In the future, if your project will need more filter requests at that time you should add many conditions to the above code. Imagine some of the queries may be advanced therefore your code to be like **Monster**!

#Discover away

Everything began from just a tutorial video called `Eloquent Techniques` in laracast. It was about a new way to make an advanced filter by use of the query string. It has to separate layer filters from controller and model. It made an Eloquent query by the use of a query string. Advanced Eloquent rescued the readability of your code by a filter class. It was very good but you had to make a method for every condition. It's boring for a creative developer. You don't have a dynamic query and you have to write many methods for per condition just in a separate layer.

#Eloquent Filter is your solution

Imagine you will install a package composer and make a query by query string without write where for every condition. Actually you just enter query string according to the principles of that package. Therefore the package will make every condition by the query string. If you want to write a custom query in the separated layer you can do it. You can set fields of your model to allow build queries by the query string. Note that the query string must be sync with the fields of your Model. Isn't great in your opinion !?. This package saves your time and your code. Fortunately like package eloquent-filter is rare in [**GitHub**](https://github.com/mehdi-fathi/eloquent-filter).

-NOTE THAT : we've released the Eloquent filter version 2 recently. We suggest to installing version 2 with the new features you can visit this link : https://dev.to/mehdifathi/introduce-eloquent-filter-2-in-laravel-12g5


#Installation

Run the Composer command
```
$ composer require mehdi-fathi/eloquent-filter:1.6.9
```
##Basic Usage

Add Filterable trait to your models and set fields that you will want a filter in whitelist. You can override this method in your models.

{% gist https://gist.github.com/mehdi-fathi/131a9b4339f59265a899a38dd41a5a29 %}

You can set `*` char for filter in all fields as like below example:

```
private static $whiteListFilter = ['*'];
```

###Use in Controller


{% gist 
https://gist.github.com/mehdi-fathi/75b647d421aca420b9ed0c6ec781df6b %}

Done it!

###Simple Example

You just pass the data blade form to query string or generate a query string in the controller method. For example:

###Simple Where

```
/users/list?email=mehdifathi.developer@gmail.com
SELECT ... WHERE ... email = 'mehdifathi.developer@gmail.com'

/users/list?first_name=mehdi&last_name=fathi
SELECT ... WHERE ... first_name = 'mehdi' AND last_name = 'fathi'

/users/list?username[]=ali&username[]=ali22&family=ahmadi
SELECT ... WHERE ... username = 'ali' OR username = 'ali22' AND family = 'ahmadi'
```
###Where by operator

You can set any operator MySQL in the query string.

```
/users/list?count_posts[operator]=>&count_posts[value]=35
SELECT ... WHERE ... count_posts > 35

/users/list?username[operator]=!=&username[value]=ali
SELECT ... WHERE ... username != 'ali'

/users/list?count_posts[operator]=<&count_posts[value]=25
SELECT ... WHERE ... count_posts < 25
```
###Special Parameters
You can set special parameters `limit` and `orderBy` in query string for make query by that.
```
/users/list?f_params[limit]=1
SELECT ... WHERE ... order by `id` desc limit 1 offset 0

/users/list?f_params[orderBy][field]=id&f_params[orderBy][type]=ASC
SELECT ... WHERE ... order by `id` ASC limit 10 offset 0
```
###Where between

If you are going to make a query whereBetween. You must fill the keys `start` and `end` in the query string. you can set it on query string as you know.

```
/users/list?created_at[start]=2016/05/01&created_at[end]=2017/10/01
SELECT ... WHERE ... created_at BETWEEN '2016/05/01' AND '2017/10/01'
```
###Advanced Where

```
/users/list?count_posts[operator]=>&count_posts[value]=10&username[]=ali&username[]=mehdi&family=ahmadi&created_at[start]=2016/05/01&created_at[end]=2020/10/01
&f_params[orderBy][field]=id&f_params[orderBy][type]=ASC

select * from `users` where `count_posts` > 10 and `username` in ('ali', 'mehdi') and 
`family` = ahmadi and `created_at` between '2016/05/01' and '2020/10/01' order by 'id' asc limit 10 offset 0
```
Just note that fields of query string be the same rows table database in `$whiteListFilter` in your model or declare the method in your model as the override method. The overriding method can be considered custom query filter.

###Custom query filter
If you are going to make yourself a query filter you can do it easily. You just make a trait and use it on model:


{% gist 
https://gist.github.com/mehdi-fathi/f0c5544aa057d5b260f73d889daa2060 %}

Note that fields of query string be the same methods of a trait. Use the trait in your model:

```
/users/list?username_like=a

select * from `users` where `username` like %a% order by `id` desc limit 10 offset 0
```
You can make every filter with eloquent-filter. If you think the eloquent-filter is useful so give a ⭐️ to that by click in the link
[**GitHub**](https://github.com/mehdi-fathi/eloquent-filter).

For more details check out [**GitHub**](https://github.com/mehdi-fathi/eloquent-filter) repository

Good luck and thank you for sharing your valuable time with me. I hope the Eloquent Filter is useful for your code. If you have any idea or opinion I glade to know it.