I don't understand how to connect three tables in Laravel.
users> id, ...
groups> id, ...
group_user> id_group, id_user
I want to return all groups to me auth()->user()->groups.
Thanks in advance.
According to your explanation, group_user table holds many-to-many relationship between Group and User model. In case of a many-to-many relationship, you actually don't need a GroupMember model. This kind of table which holds many-to-many relationship is called pivot table. Read more from the Official Documentation
The first argument is the Model you are relating to, the second one is the name of the pivot table, and third argument is the foreign key name of the model on which you are defining the relationship, while the fourth argument is the foreign key name of the model that you are joining to
User.php
class User
{
public function groups()
{
return $this->belongsToMany(Group::class,'group_user','id_user','id_group');
}
}
Related
I have a question about Laravel Eloquent Relations.
I have the following table situation:
Table guests:
id
name
...
Table landing_pages:
id
name
...
A guest can have several landing pages. And a landing page will have multiple guests.
So I thought, I can use a many-to-many relationship there and I created a new table
Table guests_landing_pages:
id
guest_id
landing_page_id
...
I would be able to use this the following way:
In guest Model I can do this, to create the many-to-many relationship:
public function landing_pages()
{
return $this->belongsToMany(\App\Models\LandingPage\LandingPage::class, 'guests_landing_pages','landing_page_id','guest_id');
}
... and the other way round in landing_page model.
But actually the table guests_landing_pages contains more data than just the guest_id and landing_page_id relation.
There are several other fields in it:
Table guests_landing_pages:
id
guest_id
landing_page_id
identifier_token
max_persons
answer
...
My question is now, how can I realize this best. If I would use the many-to-many relation as described above, I will not be able to access the fields in the intermediate table, won't I?
Or will the best solution to this to create a GuestLandingPages model with all the fields and create hasMany relations to/in both?
Laravel Eloquent has features for retrieving intermediate columns.
public function landing_pages()
{
return $this->belongsToMany(\App\Models\LandingPage\LandingPage::class, 'guests_landing_pages','landing_page_id','guest_id')
->withPivot('max_persons', 'answers');
}
How to combine 3 Many to Many tables with eloquent in the laravel
Hi Friends, please help me,
How do you combine the following three tables with eloquent in laravel?
The following table structure and figures:
(https://i.stack.imgur.com/BfISA.jpg)
Member table structure
{member_id: primary key, name, created_at, updated_at}
List table structure
{list_id: primary key, member_id: foregn key, price_id: foreign key, created_at, updated_at}
Price table structure
{price_id: primary key, name_price, created_at, updated_at}
Can you give me sample source code for view.blade, controller and model.
Thank you, your answer is very meaningful
in your member model add relationship function list(). Then in your list model add relationship function price then use below code
app\Member.php
public function list(){
return $this->hasMany('App\List', 'member_id');
}
app\List.php
public function price(){
return $this->hasMany('App\Price', 'price_id');
}
in your controller
$result = Member::with(['list.price'])->get();
it will give you a member list with list and price table data.
Please help,
I have these relationship in laravel between ITEMS, SUPPLIERS and PURCHASE_ORDERS
As ITEMS and SUPPLIERS has many to many relationship, I created an intermediate table between them, called ITEM_SUPPLIER.
Now I need to make a many to many relationship between PURCHASE_ORDERS and the intermediate table ITEM_SUPPLIER.
How do I make the relationship?
Should I create an intermediate table between them, what's the best way to name it?
Add a model for pivot table ItemSupplier whth extra column id which extends Pivot
use Illuminate\Database\Eloquent\Relations\Pivot;
class ItemSupplier extends Pivot
{
public function purchaseOrder()
{
return $this->belongsToMany(PURCHASE_ORDERS::class, item_supplier_purchase_order);
}
}
As you see you need to create a new item_supplier_purchase_order pivot table and add the relationships
class PURCHASE_ORDERS extends Model
{
public function purchaseOrder()
{
return $this->belongsToMany(ItemSupplier::class, item_supplier_purchase_order);
}
}
Add id column to the item_supplier and create ItemSupplier model for the pivot table. Then create a new item_supplier_purchase_order pivot table and two belongsToMany() relationships between ItemSupplier and PurchaseOrder models.
Also, don't forget to use cascade deleting to delete records from new pivot table when a related record is deleted from item_supplier pivot table.
I have a Tournament model which contains a belongsToMany relationship with a Session model:
class Tournament extends Model{
public function sessions(){
return $this->belongsToMany(Session::class, 'tournament_has_sessions');
}
}
Then my sessions model contains a belongsToMany relationship with the User model:
class Session extends Model{
public function users(){
return $this->belongsToMany(User::class, 'session_has_users');
}
}
Now when I delete a Tournament, I want to delete all sessions and all information in the session_has_users table with it.
I have tried:
$tournament->sessions()->with('users')->delete(); -- < This
$tournament->sessions()->delete();
$tournament->users()->detach();
$tournament->delete();
But it does't work. The data in the session_has_users table persists
I realize i could do something like this:
DB::table('session_has_users')->whereIn('session_id', $this->sessions()->pluck('id'))->delete();
But is there a more efficient/handy (or even alternative if not more efficient) way to accomplish this?
Using RDBMS Referential Actions on the Foreign Key
In the database schema, you should define the foreign key with the ON DELETE CASCADE action. This will automatically delete the related records when the referenced id is deleted.
(See dbudimir's answer for the example lines from a Laravel migration file)
Using Eloquent to Detach All Related Models
If you aren't using foreign keys or your database lacks the support for referential actions, you can use this:
$tourament->sessions()->sync([]);
The sync method accepts an array of IDs to place on the intermediate table. Any IDs that are not in the given array will be removed from the intermediate table. So, after this operation is complete, only the IDs in the given array will exist in the intermediate table:
https://laravel.com/docs/5.5/eloquent-relationships#updating-many-to-many-relationships
Providing an empty array should then remove all the relations.
In the table 'tournament_has_sessions' you can set onDelete('cascade') like this
$table->integer('tournament_id')->unsigned()->nullable();
$table->foreign('tournament_id')->references('id')->on('tournaments')->onDelete('cascade');
$table->integer('session_id')->unsigned()->nullable();
$table->foreign('session_id')->references('id')->on('sessions')->onDelete('cascade');
And when delete tournaments automaticly deleted all records in this table
you can use any of these:
$tourament->sessions()->detach();
or
$tourament->sessions()->sync([]);
or you can define the foreign key with the ON DELETE CASCADE like the answers above
I'd like your input on this.
I have a Customer_table with a field name. I have another table called Reservation_table with a Customer_name field.
How can I relate them in such a way that I'd see all the bookings by the specific customer?
In Reservation_table you should have a field(foreign key) userid in order ta have a user for each reservation.
You can using primary key - foreign key relationship to relate/join those two tables. Also, instead of having a 'Customer_name' field as your FK referring to 'name' field in 'Customer_table' table, it is better to have an id (unique) generated for each customer; This way you can have an efficient way of uniquely identifying and relating customer across tables; can save space on Database side as well. Hope this helps!
If you want to use eloquent you must first define a relationship.
One reservation belongs to a user. Here is how to define the relationships:
Inside the Reservation model:
public function user()
{
return $this->belongsTo('App/User'); //User model
}
To define the inverse you do the following:
Inside User model:
public function reservations()
{
return $this->hasMany('App/Reservation'); // Reservation Model
}
Now you can do the following in your controller:
$reservations = Auth::user()->reservations;
Now you have all reservations by the currently logged in user.
I am not sure if I got the question right so ask away.