One-to-many (hasMany) in Laravel - Mini Project: Build & Apply

Laravel One-to-Many Relationship with hasMany

📖 Scenario: You are building a simple blog system where each Author can write many Posts. You want to set up this connection in Laravel so you can easily get all posts by an author.

🎯 Goal: Create a Laravel one-to-many relationship using hasMany so that an Author model can access all its Post models.

📋 What You'll Learn

Create an Author model with a hasMany relationship method called posts

Create a Post model with a foreign key author_id

Set a variable $authorId with the value 1

Use the posts relationship to get all posts for the author with $authorId

Return the posts collection from the author

💡 Why This Matters

🌍 Real World

One-to-many relationships are common in apps like blogs, stores, or social networks where one entity owns many related items.

💼 Career

Understanding Laravel relationships is essential for backend developers working with databases and building efficient data models.

1

Create the Author model with posts relationship

Create a Laravel model class called Author that extends Model. Inside it, define a public function called posts that returns $this->hasMany(Post::class).

Laravel

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;

class Author extends Model
{
    // Define posts relationship here
}

Need a hint?

Remember, hasMany defines a one-to-many relationship from the parent model to the child model.

2

Set the author ID variable

Create a variable called $authorId and set it to the integer 1.

Laravel

hasMany(Post::class);
    }
}

// Set author ID
// Your code here

Need a hint?

Just assign the number 1 to the variable $authorId.

3

Retrieve posts for the author using the relationship

Use the Author model to find the author with $authorId using Author::find($authorId). Then get all posts for that author by accessing the posts relationship. Store the posts in a variable called $posts.

Laravel

hasMany(Post::class);
    }
}

$authorId = 1;

// Retrieve posts for author
// Your code here

Need a hint?

Use Author::find($authorId) to get the author, then access posts property to get all posts.

4

Return the posts collection

Return the $posts variable from the script.

Laravel

hasMany(Post::class);
    }
}

$authorId = 1;

$author = Author::find($authorId);
$posts = $author->posts;

// Return posts
// Your code here

Need a hint?

Simply write return $posts; to finish.