I have 2 tables Manufacturers and Suppliers ,and they have Many-to-Many relation
Schema::create('manufacturers', function (Blueprint $table) {
$table->increments('id');
$table->string('name')->unique();
$table->timestamps();
});
Schema::create('suppliers', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('location');
$table->timestamps();
});
so i created a pivot table called "manufacturer_supplier" and it works fine.
Schema::create('manufacturer_supplier', function (Blueprint $table) {
$table->increments('id');
$table->integer('manufacturer_id')->unsigned()->index();
$table->integer('supplier_id')->unsigned()->index();
$table->timestamps();
$table->foreign('manufacturer_id')->references('id')->on('manufacturers')->onDelete('cascade');
$table->foreign('supplier_id')->references('id')->on('suppliers')->onDelete('cascade');
});
My confusion comes from adding a new table "devices"
Schema::create('devices', function (Blueprint $table) {
$table->increments('id');
$table->string('serial')->unique();
$table->string('name');
$table->integer('supplier_id')->unsigned()->nullable();
$table->integer('manufacturer_id')->unsigned()->nullable();
$table->text('notes')->nullable();
$table->timestamps();
$table->foreign('supplier_id')->references('id')->on('suppliers')->onDelete('cascade');
$table->foreign('manufacturer_id')->references('id')->on('manufacturers')->onDelete('cascade');
});
where i want to have a one-to-many relation with each of suppliers and manufacturers , so i would have a select list of manufacturers and then populate the next list from with suppliers from Pivot table that relate to the selected manufacturer.
currently my "device" model has the following relations which it relate them to the original table not the pivot so it doesn't work
//5
public function manufacturer(){
return $this->belongsTo('App\Manufacturer');
}
//6
public function supplier(){
return $this->belongsTo('App\Supplier');
}
I haven't done that before so i'm curious to know what will be the best fix for this to work.
Thanks a lot ,
If you want all suppliers associated with a single manufacturer you could get them using the many-to-many relation.
$suppliersList = $supplier->manufacturer()->suppliers();
howerver I don't understand why a device should be associated with a single supplier .... but that's up to you.
Related
I am in-progress to create a project in Laravel.
I have two Database Table, which is created by migrations:
I want to setup multiple foreign key in database schema.
Table User
Schema::create('tr_users', function (Blueprint $table) {
$table->bigIncrements('id');
$table->string('name');
$table->string('email');
$table->timestamp('email_verified_at')->nullable();
$table->rememberToken();
$table->string('password');
$table->unsignedBigInteger('departement_id')->nullable();
$table->foreign('departement_id')
->references('id_departement')->on('tr_departements')
->onUpdate('cascade')
->onDelete('cascade');
});
Table Departrements
Schema::create('tr_departements', function (Blueprint $table) {
$table->bigIncrements('id_departement');
$table->string('name');
$table->timestamps();
$table->unsignedBigInteger('created_by')->nullable();
$table->foreign('created_by')
->references('id')->on('tr_users')
->onDelete('cascade');
$table->unsignedBigInteger('updated_by')->nullable();
$table->foreign('updated_by')
->references('id')->on('tr_users')
->onDelete('cascade');
});
What I want to know is how to describe relation in Models?
Edit:
My plan to use this relation is every users is belongs to departement, and any departement has many users, and every users has only one departement
If you are seeking One-to-One relationship from user to department then relation would be like this:
In your User model code would be like this:
public function department()
{
return $this->hasOne('App\Department');
}
And in your department model:
public function user()
{
return $this->belongsTo('App\User');
}
For multiple relationship you can refer laravel documentation
I need to make a HasManyThough relation where the middle Model holds the foreign keys of both Models.
Here is detail:
Migrations:
Schema::create('carriers', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
});
Schema::create('shipping_zones', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
});
Schema::create('shipping_rates', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->integer('shipping_zone_id')->unsigned()->index();
$table->integer('carrier_id')->unsigned()->index();
$table->decimal('rate', 20, 6);
});
Now I need something like
$carrier->shippingZone()
Is there any easy way to get this?
As per your migrations you need Many To Many relation rather than the HasManyThough relation.
Carrier.php
public function shippingZones()
{
return $this->belongsToMany('App\ShippingZone', 'shipping_rates);
}
You can access all shipping zones related to the carrier using, $carrier->shippingZones.
If you need to chain the query you can use $shippingZones = $carrier->shippingZones()->orderBy('id')->get(); here
If you need to use HasManyThough you would have to change the migrations. here
I have rooms in hospitals. Each room has beds with numbers. I want to assign beds to patients. How can I handle this in an easy way:
rooms migration:
Schema::create('rooms', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->integer('floor');
$table->text('description');
$table->timestamps();
});
beds migration:
Schema::create('beds', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->string('quality');
$table->string('charge');
$table->integer('room_id')->unsigned();;
$table->foreign('room_id')->references('id')->on('rooms')
->onUpdate('cascade')->onDelete('cascade');
$table->boolean('status');
$table->timestamps();
});
reservations migration:
Schema::create('reservations', function (Blueprint $table) {
$table->increments('id');
$table->date('date_in');
$table->date('date_out');
$table->boolean('status');
$table->integer('patient_id')->unsigned();
$table->foreign('patient_id')->references('id')->on('patients');
$table->integer('bed_id')->unsigned();
$table->foreign('bed_id')->references('id')->on('beds');
$table->timestamps();
});
How can I check for available beds? Get the available beds? Be sure the bed is available. How can I use events and listeners to make the whole thing work?
pluck() retrieve a Collection containing the values of a single column.
Here, it retrieves a Collection of reservation bed_id:
$reserved = Reservation::pluck('bed_id)->all();
The whereNotIn method verifies that the given column's value is not contained in the given array:
$bed_available = Bed::whereNotIn('id' , $reserved)->get();
This query gives you all the bed whose id is not available in that collection $reserved , which i think is your requirement .
I have a scenario with Articles and Categories where each article can have only one category through a CategoryGroup.
This means the article can have more than one category but only one unique category from each category_group. Or, to put it another way, the article can have only one category from each category_group.
Do I model this scenario at the level of relationships? Or is this a matter of using custom validation?
This seems like a hasOneThrough scenario but this doesn't exist. So what's the workaround?
I have tried a many-to-many relationship between articles and categories but how do I constrain the article from having more than one of each category type while attaching categories to single articles?
Schema::create('articles', function (Blueprint $table) {
$table->increments('id');
$table->string('title');
$table->text('body');
$table->string('slug');
$table->timestamps();
});
Schema::create('categories', function (Blueprint $table) {
$table->increments('id');
$table->string('name');
$table->text('description');
$table->string('slug');
$table->string('handle');
$table->integer('category_group_id')->index()->nullable();
$table->timestamps();
});
Schema::create('article_category', function (Blueprint $table) {
$table->integer('article_id')->unsigned();
$table->integer('category_id')->unsigned();
$table->primary(['article_id', 'category_id']);
$table->timestamps();
});
I have a 3 way pivot table that ties a role to a user for a specific organization. Here's how the relevant tables are set up:
//users table
Schema::create('users', function($table)
{
$table->engine = 'InnoDB';
$table->increments('id');
$table->string('username', 30)->index();
//more (irrelevant) fields here
$table->timestamps();
});
//roles table
Schema::create('roles', function(Blueprint $table)
{
$table->engine = 'InnoDB';
$table->increments('id');
$table->string('name', 100)->index();
$table->string('description', 255)->nullable();
$table->timestamps();
});
//organizations table
Schema::create('organizations', function(Blueprint $table)
{
$table->engine = 'InnoDB';
$table->increments('id');
$table->string('name', 255);
$table->string('slug', 100);
$table->text('description');
$table->timestamps();
});
//organization user role table
Schema::create('organization_user_role', function(Blueprint $table)
{
$table->engine = 'InnoDB';
$table->increments('id');
$table->integer('role_id')->unsigned()->index();
$table->foreign('role_id')->references('id')->on('roles')->onDelete('cascade');
$table->integer('user_id')->unsigned()->index();
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
$table->integer('organization_id')->unsigned()->index();
$table->foreign('organization_id')->references('id')->on('organizations')->onDelete('cascade');
$table->timestamps();
});
Each user can belong to one or more organizations, with one or more roles. Roles are tied to both a user and an organization simultaneously. That is to say, a user must have a role in an organization in order to be associated with it.
This doesn't seem to fit the mold of the traditional many-to-many relationship pivot-table that works so well out-of-the-box with Eloquent. Can Eloquent handle this type of relationship, or do I need a new model dedicated to handling the relationship? Can someone please show me what the User, Organization, and Role models would look like to tie the 3-way pivot table relationships together with Eloquent?
Check this out: http://github.com/jarektkaczyk/Eloquent-triple-pivot
It works, however I wouldn't call it complete solution. Still you can build yours on top of that.