I have a User and a Quiz models. I have many-to-many relationship defined between them in the following way:
User model
public function subscriptions()
{
return $this->belongsToMany(Quiz::class, 'subs_users', 'user_id', 'quiz_id')->withTimestamps()->withPivot('accepted');
}
Quiz model
public function subscribers()
{
return $this->belongsToMany(User::class);
}
Pivot table
Schema::create('subs_users', function (Blueprint $table) {
$table->integer('user_id')->unsigned();
$table->integer('quiz_id')->unsigned();
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
$table->foreign('quiz_id')->references('id')->on('quizzes')->onDelete('cascade');
$table->primary(['user_id', 'quiz_id']);
$table->boolean('accepted')->index();
$table->timestamps();
});
When I call $quiz->subscribers, it returns a collection of users as expected. However, $user->subscriptions always returns an empty array. Why is that?
Edit
It seems, that replacing this line in Quiz
return $this->belongsToMany(User::class);
with
return $this->belongsToMany(User::class, 'subs_users', 'quiz_id', 'user_id')->withTimestamps()->withPivot('accepted');
Solves the issue, but I still can't understand why the first variant does not work.
Look at this:
public function subscriptions()
{
return $this->belongsToMany(Quiz::class, 'subs_users', 'user_id', 'quiz_id')->withTimestamps()->withPivot('accepted');
}
You mixed the foreign key with other key: user_id and quiz_id.
Remember when doing many to many relation that: first of foreign key's declared in belongsToMany is a key related to the current model.
Replacing belongsToMany() relationship in Quiz model with following:
return $this->belongsToMany(User::class, 'subs_users');
Solves the issue. It seems, that when a non-standard name is used for the pivot table, both sides must explicitly state it. In other words, 'subs_user' pivot table name must be present in belongsToMany() relationship declarations in both models.
Related
I am trying to select the picture with the most likes within a specific category from my database. I have a database table storing the pictures and a table storing the likes. The pictures table is related to likeable table through a hasMany polymorphic relationship.
Like model:
public function likeable()
{
return $this->morphTo();
}
Picture model:
public function likes()
{
return $this->morphMany('App\Like', 'likeable');
}
Home Controller:
Picture::where('picture_type', 'food')->orderBy(likes(), 'desc')->first();
Likeable Migration:
public function up()
{
Schema::create('likeable', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id');
$table->integer('likeable_id');
$table->string('likeable_type');
$table->timestamps();
});
}
So far, the above line of code, in my home controller returns an error. From what I understand, the likes method has to be called on a specific instance. However, I do not know how to implement this all the while keeping my where clause.
Thank you for your help.
I assume you are wanting to order pictures by the most likes.
In which case, you want something like this:
Picture::withCount('likes')->where('picture_type', 'food')->orderBy('likes_count', 'desc')->first();
I would like to a user be able to only have one distrito (it means district in Portuguese). A distritocan have more than one user. It's a fairly simple relationship but the problem comes when you have a third table called distritosthat it's only job is to translate numbers into strings (I don't know the name of such tables).
Distrito table
$table->increments('id');
$table->string('distrito');
e.g.
ID DISTRITO
1 - Aveiro
2 - Beja
3 - ...
User tables
$table->string('name');
$table->string('last_name');
$table->string('profile_picture')->default('default.jpg');
$table->string('userProfile')->default('');
$table->float('stars')->default(0);
distrito_user table this table will reference where the user live
$table->integer('user_id'); //id of the user
$table->integer('distrito_id'); //Id of the district where the user lives
User's model
public function distritoUtilizador(){
return $this->belongsTo(DistritoUser::class);
}
DistritoUser's model
protected $table = 'distrito_user';
Calling the eloquent model
$user = Auth::user();
dd($user->distritoUtilizador);
It returns null.
First question: Is this the correct way to solve my problem (the user lives somewhere and I need to fill that location)?
If this is the right way to solve my problem: Why it's not returning the desired results?
For a simple one to many, just store the foreign key to distrito on the user model, no need for intermediate tables.
$table->increments('id')->unsigned();
$table->string('name');
$table->string('last_name');
$table->string('profile_picture')->default('default.jpg');
$table->string('userProfile')->default('');
$table->float('stars')->default(0);
$table->integer('distrito_id')->unsigned();
$table->foreign('distrito_id')->references('id')->on('distrito');
and get rid of the distrito_user table altogether. now use has this method:
public function distrito(){
return $this->belongsTo(Distrito::class, 'id');
}
while distrito has:
public function users(){
return $this->hasMany(User::class);
}
also change distrito migration to:
$table->increments('id')->unsigned();
I try to delete categories of user like as:
Category::with('user', Auth::user()->id)->where("user_id", $id)->delete();
Category model has relationship:
public function user()
{
return $this->belongsTo('App\User', 'user_id', 'id');
}
But it does not work for me
User model:
public function categories()
{
return $this->belongsToMany('App\Category');
}
Try without with():
Category::where("user_id", $id)->delete();
Update after the User model code addition:
The inverse of a belongsToMany relation is another belongsToMany, the inverse of a belongsTo is a hasMany or a hasOne.
You have to decide which relations between User and Category you want, because a belongsTo doesn't work with an inverse belongsToMany.
From what you wrote in answer and comments seems that you want a Many to many relationship (you have an intermediate table) in this case you have to use belongsToMany in both models and then you can use this code to delete user categories assignement:
$user->categories()->detach()
I think you need to flesh out how they will relate. Right now, based on your relationship code, the Categories table should have an user_id in it.
This is what the relationship on the Category model should look like:
public function users()
{
return $this->belongsToMany(User::class);
}
And you need a table with the name category_user to make the relationship work. Here's an example of what the migration would look like:
Schema::create('category_user', function (Blueprint $table) {
$table->increments('id');
$table->integer('category_id')->unsigned();
$table->integer('user_id')->unsigned();
$table->timestamps();
$table->foreign('category_id')->references('id')->on('categories');
$table->foreign('user_id')->references('id')->on('users');
})
Then you'd be able to add users to categories in the following ways:
$category->users()->attach(Auth::id());
Auth::user()->categories()->attach([ 1, 2, 3 ... ]);
And remove:
$category->users()->detach(Auth::id());
Auth::user()->categories()->detach([ 1, 2, 3 ... ]);
You can also use sync which would detach any element not on your array and attach any element not currently attached:
Auth::user()->categories()->sync([ 1, 2, 3, ... ]);
I am trying to understand what I am missing here.
Apps migration
Schema::create('apps', function (Blueprint $table) {
$table->increments('id');
$table->integer('show_id')->unsigned()->index();
$table->string('name');
$table->integer('provider_id')->unsigned()->index();
$table->timestamps();
});
Show migration
Schema::create('shows', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->timestamps();
});
So I create an apps model that has the following function
public function Show() {
return $this->hasOne(Show::class);
}
But in php artisan tinker when I do $app->Show; I get the following error:
Illuminate\Database\QueryException with message 'SQLSTATE[HY000]: General error: 1 no such column: shows.app_id (SQL: select * from "shows" where "shows"."app_id" = 1 and "shows"."app_id" is not null limit 1)'
Am I mis-understanding the relationships?
Your relation should be as:
Apps model:
public function show() {
return $this->hasOne(Show::class, 'id', 'show_id');
}
Or it can be:
public function show() {
return $this->belongsTo(Show::class);
}
Docs
You do not have an app_id in your shows migration.
edit: Taking from the Laravel Docs and changing it to fit your situation
Eloquent determines the foreign key of the relationship based on the model name. In this case, the show model is automatically assumed to have a app_id foreign key.
A one-to-one relationship consists of a hasOne and a belongsTo. The table that contains the foreign key field must be on the belongsTo side of the relationship.
Since your apps table contains the show_id field, it is stated that apps belong to shows, and shows has one (or many) apps.
Given this, you need to change your Show relationship on your Apps model to use the belongsTo relationship.
public function Show() {
return $this->belongsTo(Show::class, 'show_id');
}
Unless you rename your relationship method so that it is lowercase (function show()), the second parameter is required. If you renamed the relationship, Laravel could build the proper key name and you could leave off the second parameter:
public function show() {
// For belongsTo, second parameter defaults to {function_name}_id.
return $this->belongsTo(Show::class);
}
In your apps model :
public function Show() {
return $this->belongsTo('yourmodelnamespace\Show','id','show_id');
}
And you need create Show model too ..
Hope it will works~~
You can use relation like this
public function Show() {
return $this->hasOne(Show::class, 'id','id');
}
I am creating a purchased table in my application. So I have 2 tables : User and Product. Its a many to many relationship.
I know we have to create a new table for this. The naming convention for table is plural as users and products.
How would we call this purchase table? user_product or users_products?
Also I think I would need a model for this correct? If I do need a model should the naming convention for this model be User_Product?
From the documentation:
As mentioned previously, to determine the table name of the relationship's joining table, Eloquent will join the two related model names in alphabetical order. However, you are free to override this convention. You may do so by passing a second argument to the belongsToMany method
In your case, Laravel assumes that your joining table would be named product_user. No extra model is needed:
User.php
class User extends Model
{
//...
public function products()
{
return $this->belongsToMany(Product::class);
}
//...
}
Product.php
class Product extends Model
{
//...
public function users()
{
return $this->belongsToMany(User::class);
}
//...
}
And your schemas would look like so:
users table migration
Schema::create('users', function (Blueprint $table) {
$table->increments('id');
//...
});
products table migration
Schema::create('products', function (Blueprint $table) {
$table->increments('id');
//...
});
product_user table migration
Schema::create('product_user', function (Blueprint $table) {
$table->integer('product_id');
$table->integer('user_id');
//...
});
About the naming Convention, thats just something that will make your code more readable i think, so you can name it as you like(in case you are new and learning , my opinion is that its better to avoid being stuck in conventions at first , im still learning my self)
anyway a pivot model is not required, unless you simply need some custom behaviour
I think this would help you
class User extends Model
{
/**
* The products that belong to the shop.
*/
public function products()
{
return $this->belongsToMany('App\Products');
}
}
you can do this : $user->products or to query $product->users, or both.
Now, with such declaration of relationships Laravel “assumes” that pivot table name obeys the rules and is user_product. But, if it’s actually different (for example, it’s plural), you can provide it as a second parameter:
return $this->belongsToMany('App\Products', 'products_users');
If you want to know how to manage these you can find more in here