Database
I'm kind of new to databases and I made this small database, but I have problems fetching data from it.
Im trying to get all the racers from the logged in user, and it works properly, but if I enter $pigeons = $user->racer I only get back the racer table. I would like to know the attributes of the racers from the pigeons table aswell. I've made it work with query builder left joining the tables but I'm not sure why I set up this relationship if I can't use Laravel inner method.
In the User model I have these relationships:
public function pigeons(){
return $this->hasMany('App\Pigeon');
}
public function racers(){
return $this->hasManyThrough('App\Racer', 'App\Pigeon');
}
This is the Pigeon model:
public function user(){
return $this->belongsTo('App\User');
}
public function racer(){
return $this->hasMany('App\Racer');
}
}
And this is the Event model:
public function race(){
return $this->hasOne('App\Race');
}
public function racers(){
return $this->hasMany('App\Racer');
}
And this is what my EventsController looks like with the working alternative method and the commented not working.
public function upcoming(){
$id = auth()->user()->id;
$user = User::find($id);
$pigeons = DB::table('racers')->leftJoin('pigeons', 'racers.pigeon_id', '=', 'pigeons.id')->where('pigeons.user_id', '=', $id)->get();
//$pigeons = $user->racers;
return view('events.upcoming')->with('pigeons', $pigeons);
}
This is what I get with $user->racers or $user->racers()->get():
[{"id":1,"pigeon_id":14,"user_id":4,"event_id":1,"position":0,"created_at":null,"updated_at":null},{"id":2,"pigeon_id":15,"user_id":4,"event_id":1,"position":0,"created_at":null,"updated_at":null},{"id":3,"pigeon_id":16,"user_id":4,"event_id":1,"position":0,"created_at":null,"updated_at":null}]
And this is what I want to get, its not correct either since I should get id:1 but I want to pass to view these additional datas aswell like gender, color, ability (but they are in pigeons table not in racers).
[{"id":14,"pigeon_id":14,"user_id":4,"event_id":1,"position":0,"created_at":"2018-09-27 10:01:04","updated_at":"2018-09-27
10:01:04","gender":"hen","color":"blue","ability":38},{"id":15,"pigeon_id":15,"user_id":4,"event_id":1,"position":0,"created_at":"2018-09-27 10:01:04","updated_at":"2018-09-27
10:01:04","gender":"hen","color":"blue","ability":48},{"id":16,"pigeon_id":16,"user_id":4,"event_id":1,"position":0,"created_at":"2018-09-27 10:01:04","updated_at":"2018-09-27
10:01:04","gender":"cock","color":"blue","ability":11}]
To get the pigeons, what you would have to do is $pigeons = $user->racers()->get();. You can see an example of this in Laravel's official documentation https://laravel.com/docs/5.5/eloquent-relationships#introduction.
Related
Have researched extensively eloquent relationships and laravel all afternoon and can't seem to find a solution.
I have a transaction table displaying User IDs in the From and To columns. I want to show the users emails that correspond to their IDs.
Here is my relationships:
Transaction model:
public function user()
{
return $this->belongsTo('App\User', 'id', 'email');
}
User model:
public function transaction()
{
return $this->hasMany(App\Transaction);
}
And heres the code from the controller. However I KNOW this just returns ALL the transactions. But I really can't find how I would display the emails instead of the IDs:
public function index()
{
$table = Table::create(Transaction::get());
return view('table', compact('table'));
}
Maybe you should try to get transactions with related model (user) or with join to users table?
$transactions = Transaction::query()->with(['user'])->get();
$table = Table::create(Transaction::get());
$table->addColumn('email', 'E-mail', function($model) {
return $model->user->email;
});
return view('table', compact('table'));
I have the following schema set up:
users:
id
departments:
id
department_user:
id
department_id
user_id
I also have the following relationships set up:
User Model
public function departments()
{
return $this->belongsToMany('App\Resources\Eloquent\Models\Department', 'department_users');
}
Department Model
public function users()
{
return $this->belongsToMany(User::class, 'department_users');
}
For some reason, when I am trying to access through the user model $user->departments, it doesn't work - but $department->users does.
Outputting the eloquent query is as follows:
select `departments`.*, `department_users`.`user_id` as `pivot_user_id`, `department_users`.`department_id` as `pivot_department_id` from `departments` inner join `department_users` on `departments`.`id` = `department_users`.`department_id` where `department_users`.`user_id` is null
I can't seem to figure out why it is looking to see if department_users.user_id is null, when it should be looking for the user's id.
Any ideas?
Why don't you set up your models like it is suggested in the documentation here:
So your models would look something like this:
User Model
public function departments()
{
return $this->belongsToMany('path\to\your\model\Department');
}
Department Model
public function users()
{
return $this->belongsToMany(path\to\your\model\User);
}
Eloquent will join the two related model names in alphabetical order.So you don't need extra arguments when defining your relationship and Laravel also by default, makes model keys present on the pivot object. And then you can do something like this:
$department = path\to\your\model\Department::find(1);
foreach ($department->users as $user) {
echo $user;
}
For some reason, if I make the relationship the following - it works.
return $this->belongsToMany(Department::class, 'department_users')->orWhere('department_users.user_id', $this->id);
If anyone knows why, please let me know
I have 3 tables: orders, codes, events
I want to be able to pull all events that an order has, but there's an intermediary table that acts as a pivot table. I've been trying to use hasManyThrough and belongsToMany (along with withPivot) without any luck.
Examples:
public function events()
{
return $this->belongsToMany('events'); // tried this, fails
return $this->hasManyThrough('events', 'codes'); // tried this, fails
return $this->hasManyThrough('events', 'codes', 'event_id', 'id'); // tried this, fails
}
Any pointers would be great!
That's a belongsToMany setup. First, the first parameter is the name of the related class. Second, since your pivot table doesn't follow the Laravel naming conventions, you need to specify the name of the pivot table in your relationship definition:
public function events()
{
// first parameter is the name of the related class
// second parameter is pivot table name
return $this->belongsToMany(Event::class, 'codes');
}
With this setup, you can do:
// get an order
$order = Order::first();
// has all the events related to an order
$events = $order->events;
There are many ways to do this. I will show a one you can get it done.
In Order.php model
public function codes(){
return $this->has('App\Http\Code');
}
In Code.php model
public function orders(){
return $this->belongsTo('App\Http\Order');
}
public function events(){
return $this->hasMany('App\Http\Event');
}
In Event.php model
public function codes(){
return $this->belongsTo('App\Http\Code');
}
Then in you Controller, call them to get required data.
In your case you can do it like below:
$orders = Order::with(['codes' => function($q){
$q->with('events');
})->get();
May be you can get them with nested manner(not sure about this because i didn't tried before posting):
$orders = Order::with('codes.events')->get();
put return $orders; in your controller to see the query.
Enjoy!
I have a model Listing that inherits through its belongsTo('Model') relationship should inherently belong to the Manufacturer that its corresponding Model belongs to.
Here's from my Listing model:
public function model()
{
return $this->belongsTo('Model', 'model_id');
}
public function manufacturer()
{
return $this->belongsTo('Manufacturer', 'models.manufacturer_id');
/*
$manufacturer_id = $this->model->manufacturer_id;
return Manufacturer::find($manufacturer_id)->name;*/
}
and my Manufacturer model:
public function listings()
{
return $this->hasManyThrough('Listing', 'Model', 'manufacturer_id', 'model_id');
}
public function models()
{
return $this->hasMany('Model', 'manufacturer_id');
}
I am able to echo $listing->model->name in a view, but not $listing->manufacturer->name. That throws an error. I tried the commented out 2 lines in the Listing model just to get the effect so then I could echo $listing->manufacturer() and that would work, but that doesn't properly establish their relationship. How do I do this? Thanks.
Revised Listing model (thanks to answerer):
public function model()
{
return $this->belongsTo('Model', 'model_id');
}
public function manufacturer()
{
return $this->belongsTo('Model', 'model_id')
->join('manufacturers', 'manufacturers.id', '=', 'models.manufacturer_id');
}
I found a solution, but it's not extremely straight forward. I've posted it below, but I posted what I think is the better solution first.
You shouldn't be able to access manufacturer directly from the listing, since manufacturer applies to the Model only. Though you can eager-load the manufacturer relationships from the listing object, see below.
class Listing extends Eloquent
{
public function model()
{
return $this->belongsTo('Model', 'model_id');
}
}
class Model extends Eloquent
{
public function manufacturer()
{
return $this->belongsTo('manufacturer');
}
}
class Manufacturer extends Eloquent
{
}
$listings = Listing::with('model.manufacturer')->all();
foreach($listings as $listing) {
echo $listing->model->name . ' by ' . $listing->model->manufacturer->name;
}
It took a bit of finagling, to get your requested solution working. The solution looks like this:
public function manufacturer()
{
$instance = new Manufacturer();
$instance->setTable('models');
$query = $instance->newQuery();
return (new BelongsTo($query, $this, 'model_id', $instance->getKeyName(), 'manufacturer'))
->join('manufacturers', 'manufacturers.id', '=', 'models.manufacturer_id')
->select(DB::raw('manufacturers.*'));
}
I started off by working with the query and building the response from that. The query I was looking to create was something along the lines of:
SELECT * FROM manufacturers ma
JOIN models m on m.manufacturer_id = ma.id
WHERE m.id in (?)
The query that would be normally created by doing return $this->belongsTo('Manufacturer');
select * from `manufacturers` where `manufacturers`.`id` in (?)
The ? would be replaced by the value of manufacturer_id columns from the listings table. This column doesn't exist, so a single 0 would be inserted and you'd never return a manufacturer.
In the query I wanted to recreate I was constraining by models.id. I could easily access that value in my relationship by defining the foreign key. So the relationship became
return $this->belongsTo('Manufacturer', 'model_id');
This produces the same query as it did before, but populates the ? with the model_ids. So this returns results, but generally incorrect results. Then I aimed to change the base table that I was selecting from. This value is derived from the model, so I changed the passed in model to Model.
return $this->belongsTo('Model', 'model_id');
We've now mimic the model relationship, so that's great I hadn't really got anywhere. But at least now, I could make the join to the manufacturers table. So again I updated the relationship:
return $this->belongsTo('Model', 'model_id')
->join('manufacturers', 'manufacturers.id', '=', 'models.manufacturer_id');
This got us one step closer, generating the following query:
select * from `models`
inner join `manufacturers` on `manufacturers`.`id` = `models`.`manufacturer_id`
where `models`.`id` in (?)
From here, I wanted to limit the columns I was querying for to just the manufacturer columns, to do this I added the select specification. This brought the relationship to:
return $this->belongsTo('Model', 'model_id')
->join('manufacturers', 'manufacturers.id', '=', 'models.manufacturer_id')
->select(DB::raw('manufacturers.*'));
And got the query to
select manufacturers.* from `models`
inner join `manufacturers` on `manufacturers`.`id` = `models`.`manufacturer_id`
where `models`.`id` in (?)
Now we have a 100% valid query, but the objects being returned from the relationship are of type Model not Manufacturer. And that's where the last bit of trickery came in. I needed to return a Manufacturer, but wanted it to constrain by themodelstable in the where clause. I created a new instance of Manufacturer and set the table tomodels` and manually create the relationship.
It is important to note, that saving will not work.
$listing = Listing::find(1);
$listing->manufacturer()->associate(Manufacturer::create([]));
$listing->save();
This will create a new Manufacturer and then update listings.model_id to the new manufacturer's id.
I guess that this could help, it helped me:
class Car extends Model
{
public function mechanical()
{
return $this->belongsTo(Mechanical::class);
}
}
class CarPiece extends Model
{
public function car()
{
return $this->belongsTo(Car::class);
}
public function mechanical()
{
return $this->car->mechanical();
}
}
At least, it was this need that made me think of the existence of a belongsToThrough
You can do something like this (Student Group -> Users -> Poll results):
// poll result
public function studentGroup(): HasOneDeep
{
return $this->hasOneDeepFromRelations($this->user(), (new User())->studentGroup());
}
I have three tables like this:
**Users**
id
**Posts**
id
user_id
**Favorites**
id
user_id
post_id
Currently, I made it so when I query my posts for display, it pulls all the related user data who created the post with that row which is great! But what I'm trying to do now is also add to see if the user Authorized (Logged in) has favorited the post (row) so I can display to that they already favorited it. I don't want to re-query for every post (i think its called the N+1 problem?). I'm using Laravel4
Post model
class Post extends Eloquent{
public function user(){
return $this->belongsTo('User');
}
User model
public function posts(){
return $this->hasMany('Post');
}
PostsController
public function index()
{
$posts = Post::with('user')->paginate(25);
return View::make('index', compact('posts'));
}
Step 1. Add favorites relationship in Post model.
public function favorites() {
return $this->hasMany('Favorite');
}
When querying the Model.
$auth_user_id = Auth::user()->id;
$posts = Post::with(array('user', 'favorites' => function($query) use ($auth_user_id){
$query->where('user_id', '=', $auth_user_id);
}))->get();
For more information refer to the eager load constraints,
http://laravel.com/docs/eloquent#eager-loading
Adding a many-to-many relationship using the favorites table as pivot would be one approach.
Add favorites relationship in User model:
public function favorites() {
return $this->belongsToMany('Post', 'favorites');
}
You should then be able to get all favorites by simply accessing
Auth::user()->favorites
To find whether the current post is a favorite, use
$isFavorite = Auth::user()->favorites->has($post->id);