harikrishnanr's Blog

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  8655 views · 4 years ago

![Laravel Eloquent Relationship Part 2](https:/ /images.ctfassets.net/vzl5fkwyme3u/3gY1sugUC3gTUtfgbhgNi5/410818aed6a8d4ea08e0ec796477291c/laravel_blog.png?w=1000)

As you all know, Laravel Eloquent Relationships are powerful and easy methods introduced by Laravel for helping developers to reduce the complexity when connecting with multiple tables. While connecting with multiple tables, this method is very easy for developers for creating the application

Here you can see the next three methods of the eloquent relationships:

1. Has Many Through Relationship

2. One to Many Polymorphic

3. Many to many Polymorphic


Has many through is a little bit complicated while understanding. I will provide a shortcut method to provide access data of another mode relationship. We will create a user table, post table, and country table and they will be interconnected with each other.

  14301 views · 5 years ago

![Laravel Eloquent Relationship Part 1](https://images.ctfassets.net/vzl5fkwyme3u/2iNUlfYJ8SZVYUSemRAszt/eeb78994b12f1491f654d77026ab6c33/AdobeStock_199075029.png?w=1000)

Laravel introduces eloquent relationships from laravel 5.0 onwards. We all know, while we creating an application we all have foreign keys. Each table will be connected to some other. Eloquent make easy to connect each tables easily. Here we will One to one, one to many and many to many relationships. Here we will see three types of relationships,

1. One to one relationships

2. One to many relationships

3. Many to many relationships

## Why Eloquent Relationships

Here we have 2 tables, students and marks, so for join each table,


$student = student::join(‘marks’,’marks.student_id,’=’,students.id’)->where(‘students.id’,’1’)->get();



the above query is to l...

  15685 views · 5 years ago

![Create Alarm and Monitoring on Custom Memory and Disk Metrics for Amazon EC2](https://images.ctfassets.net/vzl5fkwyme3u/2HgdCq2lZucMyuiYyYiQie/b7376c29a2f94799613e8c1cb8ff4d3b/AdobeStock_91111530.jpeg?w=1000)

Today I am going write a blog on how to Monitor Memory and Disk custom metrics and creating alarm in Ubuntu.

To do this, we can use Amazon CloudWatch, which provides a flexible, scalable and reliable solution for monitoring our server.

Amazon Cloud Watch will allow us to collect the custom metrics from our applications that we will monitor to troubleshoot any issues, spot trends, and configure operational performance. CloudWatch functions display alarms, graphs, custom metrics data and including statistics.

## Installing the Scripts

Before we start installing the scripts for monitoring, we should install all the dependent packages need to perform on Ubuntu.

First login to your AWS server, and from...

  19634 views · 5 years ago

![Generate PDF from HTML in Laravel 5.7](https://images.ctfassets.net/vzl5fkwyme3u/7BjL7ILSA84wgAUIo2K2yg/43ac850a592f4a272e910c30e06b97ba/AdobeStock_39841236.jpeg?w=1000)

Today, I will share with you how to create a PDF file from HTML blade file in Laravel 5.7. We will be using `dompdf` package for generating the PDF file.

In the below example, we will install `barryvdh/laravel-dompdf` using composer package and thereafter we will add new route url with controller. Then we will create a blade file. Then after we have to just run project with serve and we can check the PDF file is for download.

## Download Laravel 5.7

Now I am going to explain the step by step from scratch with laravel installation for `dompdf`. To get started, we need to download fresh Laravel 5.7 application using command, so open our terminal and run the below command in the command prompt:


composer create-project --prefer-dist laravel/lara...

  22773 views · 5 years ago

![Making Charts and Graphs using Laravel](https://images.ctfassets.net/vzl5fkwyme3u/5BTS4j0szSISc42GiMM64C/4261e509221448298776024a6f6629cd/AdobeStock_203669380.jpeg?w=1000)

## Installing composer

Composer is a package management tool for PHP. Laravel requires composer for installation. We can download composer from [https://getcomposer.org/download/](https://getcomposer.org/download/)

After installation that you can test whether composer installed or not by command


## Installing Laravel

The current stable version of laravel is laravel 5.6. We can install laravel package with three ways.

In command prompt or terminal by running `composer global require "laravel/installer"` and then `Laravel new `


We can create the project with Composer by running `composer create-project --prefer-dist laravel/laravel `