Understanding Model Relationships in Laravel (And Why They Are a Good Practice)

When working with Laravel, developers often interact with multiple database tables that are connected to each other. A common example is a users table connected to another table like members, posts, or orders.

Interestingly, you can still retrieve related data even if you don’t define a relationship in your models. However, Laravel provides a powerful feature called Eloquent Relationships, and using them is considered a best practice for building clean and maintainable applications.

Let’s understand this concept with a simple example.

Querying Data Without Defining a Relationship

Suppose you have two tables:

users

members

Here, user_id in the members table is a foreign key referencing users.id.

You can retrieve the members of the logged-in user like this:

$members = Member::where('user_id', Auth::id())->get();

$members = Member::where('user_id', Auth::id())->get();

This works perfectly. Laravel simply runs a query like:

SELECT * FROM members WHERE user_id = 1;

SELECT * FROM members WHERE user_id = 1;

So technically, you do not need to define a relationship for this query to work.

Defining Relationships in Laravel

Laravel’s Eloquent ORM allows you to define relationships directly in your models.

For example:

User Model

public function members()
{
    return $this->hasMany(Member::class);
}

public function members()
{
    return $this->hasMany(Member::class);
}

Member Model

public function user()
{
    return $this->belongsTo(User::class);
}

public function user()
{
    return $this->belongsTo(User::class);
}

Now you can retrieve members like this:

$members = Auth::user()->members;

$members = Auth::user()->members;

Laravel automatically understands that:

users.id → members.user_id

users.id → members.user_id

Why Relationships Are a Good Practice

Even though manual queries work, defining relationships provides several important benefits.

1. Cleaner and More Readable Code

Instead of writing:

Member::where('user_id', Auth::id())->get();

Member::where('user_id', Auth::id())->get();

You can write:

Auth::user()->members;

Auth::user()->members;

This makes your code more expressive and easier to understand.

2. Better Maintainability

When relationships are defined in models, all logic about how tables connect is stored in one place.

If your database structure changes later, you only need to update the model relationship instead of searching through many queries across your project.

3. Powerful Query Features

Laravel relationships unlock many powerful features such as:

Eager Loading

User::with('members')->get();

User::with('members')->get();

This prevents the N+1 query problem and improves performance.

4. Easy Nested Data Access

With relationships you can easily access related models.

Example:

$member = Member::find(1);
$user = $member->user;

$member = Member::find(1);
$user = $member->user;

Laravel automatically fetches the related user.

5. Cleaner Application Architecture

Using relationships encourages a proper domain structure where models represent real-world connections. This leads to more professional and scalable Laravel applications.

Conclusion

While it is possible to query related data using manual conditions like where('user_id', ...), defining relationships in Laravel models is considered a best practice.

Relationships make your code:

• cleaner
• easier to maintain
• more expressive
• more powerful for complex queries

As your Laravel application grows, using Eloquent relationships will help keep your codebase organized and efficient.

In short: manual queries work, but relationships make your Laravel code truly elegant.