Eloquent: Collections
Introduction
All Eloquent methods that return more than one model result will return instances of the Illuminate\Database\Eloquent\Collection
class, including results retrieved via the get
method or accessed via a relationship. The Eloquent collection object extends Laravel's base collection, so it naturally inherits dozens of methods used to fluently work with the underlying array of Eloquent models. Be sure to review the Laravel collection documentation to learn all about these helpful methods!
All collections also serve as iterators, allowing you to loop over them as if they were simple PHP arrays:
use App\Models\User; $users = User::where('active', 1)->get(); foreach ($users as $user) { echo $user->name;}
However, as previously mentioned, collections are much more powerful than arrays and expose a variety of map / reduce operations that may be chained using an intuitive interface. For example, we may remove all inactive models and then gather the first name for each remaining user:
$names = User::all()->reject(function (User $user) { return $user->active === false;})->map(function (User $user) { return $user->name;});
Eloquent Collection Conversion
While most Eloquent collection methods return a new instance of an Eloquent collection, the collapse
, flatten
, flip
, keys
, pluck
, and zip
methods return a base collection instance. Likewise, if a map
operation returns a collection that does not contain any Eloquent models, it will be converted to a base collection instance.
Available Methods
All Eloquent collections extend the base Laravel collection object; therefore, they inherit all of the powerful methods provided by the base collection class.
In addition, the Illuminate\Database\Eloquent\Collection
class provides a superset of methods to aid with managing your model collections. Most methods return Illuminate\Database\Eloquent\Collection
instances; however, some methods, like modelKeys
, return an Illuminate\Support\Collection
instance.
append contains diff except find findOrFail fresh intersect load loadMissing modelKeys makeVisible makeHidden only setVisible setHidden toQuery unique
append($attributes)
The append
method may be used to indicate that an attribute should be appended for every model in the collection. This method accepts an array of attributes or a single attribute:
$users->append('team'); $users->append(['team', 'is_admin']);
contains($key, $operator = null, $value = null)
The contains
method may be used to determine if a given model instance is contained by the collection. This method accepts a primary key or a model instance:
$users->contains(1); $users->contains(User::find(1));
diff($items)
The diff
method returns all of the models that are not present in the given collection:
use App\Models\User; $users = $users->diff(User::whereIn('id', [1, 2, 3])->get());
except($keys)
The except
method returns all of the models that do not have the given primary keys:
$users = $users->except([1, 2, 3]);
find($key)
The find
method returns the model that has a primary key matching the given key. If $key
is a model instance, find
will attempt to return a model matching the primary key. If $key
is an array of keys, find
will return all models which have a primary key in the given array:
$users = User::all(); $user = $users->find(1);
findOrFail($key)
The findOrFail
method returns the model that has a primary key matching the given key or throws an Illuminate\Database\Eloquent\ModelNotFoundException
exception if no matching model can be found in the collection:
$users = User::all(); $user = $users->findOrFail(1);
fresh($with = [])
The fresh
method retrieves a fresh instance of each model in the collection from the database. In addition, any specified relationships will be eager loaded:
$users = $users->fresh(); $users = $users->fresh('comments');
intersect($items)
The intersect
method returns all of the models that are also present in the given collection:
use App\Models\User; $users = $users->intersect(User::whereIn('id', [1, 2, 3])->get());
load($relations)
The load
method eager loads the given relationships for all models in the collection:
$users->load(['comments', 'posts']); $users->load('comments.author'); $users->load(['comments', 'posts' => fn ($query) => $query->where('active', 1)]);
loadMissing($relations)
The loadMissing
method eager loads the given relationships for all models in the collection if the relationships are not already loaded:
$users->loadMissing(['comments', 'posts']); $users->loadMissing('comments.author'); $users->loadMissing(['comments', 'posts' => fn ($query) => $query->where('active', 1)]);
modelKeys()
The modelKeys
method returns the primary keys for all models in the collection:
$users->modelKeys(); // [1, 2, 3, 4, 5]
makeVisible($attributes)
The makeVisible
method makes attributes visible that are typically "hidden" on each model in the collection:
$users = $users->makeVisible(['address', 'phone_number']);
makeHidden($attributes)
The makeHidden
method hides attributes that are typically "visible" on each model in the collection:
$users = $users->makeHidden(['address', 'phone_number']);
only($keys)
The only
method returns all of the models that have the given primary keys:
$users = $users->only([1, 2, 3]);
setVisible($attributes)
The setVisible
method temporarily overrides all of the visible attributes on each model in the collection:
$users = $users->setVisible(['id', 'name']);
setHidden($attributes)
The setHidden
method temporarily overrides all of the hidden attributes on each model in the collection:
$users = $users->setHidden(['email', 'password', 'remember_token']);
toQuery()
The toQuery
method returns an Eloquent query builder instance containing a whereIn
constraint on the collection model's primary keys:
use App\Models\User; $users = User::where('status', 'VIP')->get(); $users->toQuery()->update([ 'status' => 'Administrator',]);
unique($key = null, $strict = false)
The unique
method returns all of the unique models in the collection. Any models with the same primary key as another model in the collection are removed:
$users = $users->unique();
Custom Collections
If you would like to use a custom Collection
object when interacting with a given model, you may define a newCollection
method on your model:
<?php namespace App\Models; use App\Support\UserCollection;use Illuminate\Database\Eloquent\Collection;use Illuminate\Database\Eloquent\Model; class User extends Model{ /** * Create a new Eloquent Collection instance. * * @param array<int, \Illuminate\Database\Eloquent\Model> $models * @return \Illuminate\Database\Eloquent\Collection<int, \Illuminate\Database\Eloquent\Model> */ public function newCollection(array $models = []): Collection { return new UserCollection($models); }}
Once you have defined a newCollection
method, you will receive an instance of your custom collection anytime Eloquent would normally return an Illuminate\Database\Eloquent\Collection
instance. If you would like to use a custom collection for every model in your application, you should define the newCollection
method on a base model class that is extended by all of your application's models.