Laravel Eloquent Development

When to Apply

Activate this skill when:

•Creating or modifying Eloquent models
•Defining model relationships
•Writing query scopes (local or global)
•Optimizing queries or fixing N+1 problems
•Working with accessors, mutators, or casts
•Implementing model events or observers

Documentation

Use search-docs for detailed Eloquent patterns and documentation.

Basic Usage

Creating Models

Use Artisan to create models with related files:

bash

php artisan make:model Post --migration --factory --seeder

Relationships

Always use explicit return types on relationship methods:

<code-snippet name="Eloquent Relationships" lang="php"> use Illuminate\Database\Eloquent\Relations\HasMany; use Illuminate\Database\Eloquent\Relations\BelongsTo;

public function posts(): HasMany { return $this->hasMany(Post::class); }

public function author(): BelongsTo { return $this->belongsTo(User::class, 'author_id'); } </code-snippet>

Eager Loading

Prevent N+1 queries by eager loading relationships:

<code-snippet name="Eager Loading" lang="php"> // Good - eager loads in 2 queries $posts = Post::with(['author', 'comments'])->get();

// Bad - causes N+1 queries $posts = Post::all(); foreach ($posts as $post) { echo $post->author->name; // Query per post } </code-snippet>

Constraining Eager Loads

<code-snippet name="Constrained Eager Loading" lang="php"> $users = User::with(['posts' => function ($query) { $query->where('published', true) ->latest() ->limit(10); }])->get(); </code-snippet>

Local Scopes

<code-snippet name="Local Scopes" lang="php"> use Illuminate\Database\Eloquent\Builder;

public function scopePublished(Builder $query): Builder { return $query->where('published_at', '<=', now()); }

public function scopeByAuthor(Builder $query, User $author): Builder { return $query->where('author_id', $author->id); }

// Usage Post::published()->byAuthor($user)->get(); </code-snippet>

Casts

Define casts in the casts() method (Laravel 11+):

<code-snippet name="Model Casts" lang="php"> protected function casts(): array { return [ 'published_at' => 'datetime', 'metadata' => 'array', 'is_featured' => 'boolean', 'status' => PostStatus::class, ]; } </code-snippet>

Accessors and Mutators

Use attribute casting for simple transformations:

<code-snippet name="Accessors and Mutators" lang="php"> use Illuminate\Database\Eloquent\Casts\Attribute;

protected function fullName(): Attribute { return Attribute::make( get: fn () => "{$this->first_name} {$this->last_name}", ); }

protected function email(): Attribute { return Attribute::make( set: fn (string $value) => strtolower($value), ); } </code-snippet>

Query Building

Prefer Model::query() over DB:: facade:

<code-snippet name="Query Building" lang="php"> // Good $posts = Post::query() ->where('status', 'published') ->whereHas('author', fn ($q) => $q->where('active', true)) ->orderByDesc('created_at') ->paginate(15);

// Avoid $posts = DB::table('posts')->where(...)->get(); </code-snippet>

Model Events and Observers

<code-snippet name="Model Observer" lang="php"> // app/Observers/PostObserver.php class PostObserver { public function creating(Post $post): void { $post->slug = Str::slug($post->title); }

code

public function deleted(Post $post): void
{
    Storage::delete($post->featured_image);
}

} </code-snippet>

Common Pitfalls

•Not using eager loading, causing N+1 queries
•Using DB:: instead of Eloquent models
•Missing return types on relationship methods
•Forgetting to create factories and seeders with new models
•Using $casts property instead of casts() method in Laravel 11+
•Not constraining eager loads when only subset of data is needed