Recently I use Laravel to define the 'follow' relationship between users. Here are the models:
class User extends Model
{
public function follows()
{
return $this->morphMany('App\User', 'followable');
}
}
class Follow extends Model
{
public function followable()
{
return $this->morphTo();
}
}
and the database for Follow is like this:
follows:
- id:
- user_id:
- followable_id:
- followable_type:
all the above are defined according to the examples which Laravel documents provides.
And now I can retrieve the user model like this:
$follow = Follow:find(1);
$user = $follow->followable;
But when I write code like this:
$followers = $user->follows;
I get errors:
Relationship method must return an object of type
Illuminate\Database\Eloquent\Relations\Relation
here is my question:
Did I define the relationship of 'follow' right? and how can I fix the errors?
Thanks.
try this
class User extends Model
{
public function follows()
{
return $this->morphMany('App\User', 'followable');
}
}
change in to
class User extends Model
{
public function follows()
{
return $this->morphMany('App\Follow', 'followable');
}
}
because your have given model name is incorrect.
Related
If I have below models:
class User extends Model{
protected $someDataFromExt = ['taskID0' => 'test', 'taskID1' => 'ting'];
public function tasks() { return $this->hasMany('Task'); }
}
class Task extends Model{
protected $appends = ['ext_data'];
public function user() { return $this->belongsTo('User'); }
public function getExtDataAttribute(){ return $this->external_data; }
}
I would like, when I do: $tasks = auth()->user()->tasks->all(); I want to pass $user->someDataFromExt (based on task ID) to task model, so I later in my $tasks variable I can access:
foreach($tasks as $task){
echo $task->ext_data;
}
Which will return data that was given from user model earlier?
Is this possible? how?
Not completely following why the task data is being stored on the user model, but I think what you’re asking can be achieved via your accessor method on your task model, providing you make the someDataFromExt public:
<?php
class Task extends Model {
public function getExtDataAttribute()
{
return $this->user->someDataFromExt['taskID' . $this->id];
}
}
Suppose I got a model with a few relations:
class Author extends Model
{
public function shortStories()
{
return $this->hasMany(ShortStory::class);
}
public function essays()
{
return $this->hasMany(Essay::class);
}
public function books()
{
return $this->hasMany(Book::class);
}
}
Now suppose I got two more models that want to eager load this model with its relations:
class Publisher extends Model
{
public function scopeWithAuthor($query)
{
$query->with('author.shortStories', 'author.essays', 'author.books');
}
}
class Reviewer extends Model
{
public function scopeWithAuthor($query)
{
$query->with('author.shortStories', 'author.essays', 'author.books');
}
}
Problem - if the relations of author change I now need to reflect this in multiple locations.
My question - how do I achieve this in DRY style?
I know that I could add a protected $with to the Author class but then it would always load the relation, not just when required.
With that in mind, one solution I have come up with is to extend the Author model like so:
class AuthorWithRelations extends Author
{
protected $with = ['shortStories', 'essays', 'books'];
}
This then allows me to refactor the scopes of the other models like so:
class Publisher extends Model
{
public function scopeWithAuthor($query)
{
$query->with('authorWithRelations');
}
}
class Reviewer extends Model
{
public function scopeWithAuthor($query)
{
$query->with('authorWithRelations');
}
}
This works well enough but really I was wondering if Laravel provides a better / inbuilt approach to this?
Hello I´m writing an API and I want to display more information about the related model.
Routes.php
Route::resource('makes', 'MakesController');
MakesController.php
class MakesController extends Controller
{
public function index()
{
$data = Make::all();
return response()->json($data);
}
}
This returns only information about the makes (id, name)
but how can I display also how many models has each make?
I have defined these two models
class Make extends Model
{
public function models()
{
return $this->hasMany('App\CarModel');
}
}
class CarModel extends Model
{
public function make()
{
return $this->belongsTo('App\Make');
}
}
You can define $visible field in the Make model's class like this:
protected $visible = ['models'];
This will automatically appends the related model's array to array/json.
You can also use an optional way with makeVisible method:
class MakesController extends Controller
{
public function index()
{
$data = Make::all();
return response()->makeVisible('models')->json($data);
}
}
I have the following problem,
I have four models:
MainArea |Institute|institute_level|students with the following reations:
class MainArea extends Model
{
public function institute(){
return $this->belongsTo('\App\Institute');
}
public function places(){
return $this->hasMany('\App\Place');
}
}
class Institute extends Model
{
public function insLevel(){
return $this->hasMany('\App\InstituteLevel');
}
}
class InstituteLevel extends Model
{
public function students(){
return $this->hasMany('\App\Student','applying_level');
}
}
class Student extends Model
{
public function instituteLevel(){
return $this->belongsTo('\App\InstituteLevel','institute_level_id');
}
public function place(){
return $this->belongsTo('\App\Place');
}
}
Now, I want to get all areas with the count of students registered in it, in the same institute? it should be something like this.
$areas=\App\MainArea::withCount('institute.insLevel.students')->where('institute_id',$id)->get();
Any suggestions ?
Unfortunately, "withCount()" doesn't support nested relationships as of Laravel 5.2.
Here's the comment from the contributor in a Github Pull Request.
I am struggling with working with relationships right now and would like some help as for how to make this relationship work. I am using Laravel.
Lets say you have a staff model that looks like so:
Staff.php
class Staff extends \Eloquent {
protected $fillable = [];
public function status()
{
return $this->belongsTo('Staff_status');
}
}
The database table for the staff is as follows:
Table Name: staff
Fields: id, staffer_name, status_id
You also have a staff status model represented below:
Staff_statuses.php
class Staff_status extends Eloquent {
public function staff()
{
return $this->hasMany('Staff');
}
}
You also have a staff database table like so:
Table Name: staff_statuses
Fields: id, status_name
However when I try and load the staff controller index method it says class Staff_status is not found.
Any idea why?
You have used Staff_statuses.php as the name of your model but you are using Staff_status in the class name and thus you are calling it using Staff_status from your controller as well. This is the problem.
Change the file name to match the class name. For example, use something like this:
// StaffStatus.php
class StaffStatus extends Eloquent{
protected $table = 'staff_statuses';
public function staff()
{
return $this->hasMany('Staff');
}
}
// Staff.php
class Staff extends Eloquent {
protected $table = 'staff';
protected $fillable = [];
public function status()
{
return $this->belongsTo('StaffStatus');
}
}
In the controller you may use something like this:
$staffStatus = StaffStatus::all();
$staff = Staff::all();
namespace App;
use Illuminate\Database\Eloquent\Model;
class Photo extends Model
{
public function imageable()
{
return $this->morphTo();
}
}
class Staff extends Model
{
public function photos()
{
return $this->morphMany('App\Photo', 'imageable');
}
}
class Product extends Model
{
public function photos()
{
return $this->morphMany('App\Photo', 'imageable');
}
}