I have a database with the following tables and relationships:
Advert 1-1 Car m-1 Model m-1 Brand
If I want to retrieve an Advert, I can simply use:
Advert::find(1);
If I want the details of the car, I could use:
Advert::find(1)->with('Car');
However, if I also want the detail of the Model (following the relationship with Car), what would the syntax be, the following doesn't work:
Advert::find(1)->with('Car')->with('Model');
Many thanks
It's in the official documentation under "Eager Loading"
Multiple relationships:
$books = Book::with('author', 'publisher')->get();
Nested relationships:
$books = Book::with('author.contacts')->get();
So for you:
Advert::with('Car.Model')->find(1);
First you need to create your relations,
<?php
class Advert extends Eloquent {
public function car()
{
return $this->belongsTo('Car');
}
}
class Car extends Eloquent {
public function model()
{
return $this->belongsTo('Model');
}
}
class Model extends Eloquent {
public function brand()
{
return $this->belongsTo('Brand');
}
public function cars()
{
return $this->hasMany('Car');
}
}
class Brand extends Eloquent {
public function models()
{
return $this->hasMany('Model');
}
}
Then you just have to access this way:
echo Advert::find(1)->car->model->brand->name;
But your table fields shoud be, because Laravel guess them that way:
id (for all tables)
car_id
model_id
brand_id
Or you'll have to specify them in the relationship.
Suppose you have 3 models region,city,hotels and to get all hotels with city and region then
Define relationship in them as follows:-
Hotel.php
class Hotel extends Model {
public function cities(){
return $this->hasMany(City::class);
}
public function city(){
return $this->belongsTo('App\City','city_id');
}
}
City.php
class City extends Model {
public function hotels(){
return $this->hasMany(Hotel::class);
}
public function regions(){
return $this->belongsTo('App\Region','region_id');
}
}
Region.php
class Region extends Model
{
public function cities(){
return $this->hasMany('App\City');
}
public function country(){
return $this->belongsTo('App\Country','country_id');
}
}
HotelController.php
public function getAllHotels(){
// get all hotes with city and region
$hotels = Hotel::with('city.regions')->get()->toArray();
}
will adding the relation function just ask for the relation needed
public function Car()
{
return $this->belongsTo(Car::class, 'car_id')->with('Model');
}
but if you want a nested relation just use the period in the with
Advert::with('Car.Model')->find(1);
but for multi-relation use the array
Advert::with('Car','Model')->find(1);
Related
These are my tables many-to-many:
products and suppliers, however I need to relate the pivot(product_supplier) to a table called payment_supplier.
Product model
public function suppliers(){
return $this->belongsToMany('App\Supplier');
}
Supplier model
public function products(){
return $this->belongsToMany('App\Product');
}
but I need to relate pivot product_supplier to payment_supplier table just like described on the diagram
In this case, you could use a pivot model.
# Product Model
public function suppliers() {
return $this->belongsToMany(Supplier::class)->using(ProductSupplier::class);
}
# Supplier Model
public function products(){
return $this->belongsToMany(Product::class)->using(ProductSupplier::class);
}
# ProductSupplier Pivot Model
<?php
namespace App;
use Illuminate\Database\Eloquent\Relations\Pivot;
class ProductSupplier extends Pivot
{
public function payment_supplier()
{
return $this->hasMany(PaymentSupplier::class);
}
}
However, doing it like this has a big problem: You CANNOT eager load a pivot's relationships. Not without an override (or a package).
The other way to go about it is using hasManyThrough
# Product Model
public function suppliers()
{
return $this->belongsToMany(Supplier::class)->using(ProductSupplier::class);
}
public function payment_suppliers()
{
return $this->hasManyThrough(PaymentSupplier::class, ProductSupplier::class);
}
# Supplier Model
public function products()
{
return $this->belongsToMany(Product::class)->using(ProductSupplier::class);
}
public function payment_suppliers()
{
return $this->hasManyThrough(PaymentSupplier::class, ProductSupplier::class);
}
This gives you every PaymentSupplier for a single Supplier/Product, so you'll need to apply some kind of filtering.
Consider I'm a hotel owner, and I have to know the bookings related to my hotel.
I need all bookings that which associated with my hotel.
Is there any eloquent functions to join? How?
How to get bookings of a hotel with owner(userid) with using eloquent relationship functions?
Hotel.php
class Hotel extends Model
{
public function userId(){
return $this->belongsTo(User::class,'user_id');
}
public function rooms(){
return $this->hasMany(Room::class,'hotel_id','id');
}
}
Room.php
class Room extends Model
{
public function hotelId(){
return $this->belongsTo(Hotel::class,'hotel_id');
}
public function bookings(){
return $this->hasMany(Booking::class,'room_id','id');
}
}
User.php
class User extends Model
{
public function hotels(){
return $this->hasMany(Hotel::class,'user_id','id');
}
}
Below code add in your respective controller.
$user = \App\User::find(Auth::id());
$hotels = $user->hotels;
foreach ($hotels as $hotel) {
$rooms = $hotel->rooms;
foreach ($rooms as $room) {
print_r($room->bookings);
}
}
Define the relationship with user in model
class Booking extends Model{
/**
* Get the user that owns the booking.
*/
public function owner()
{
return $this->belongsTo(App\User::class,'user_id,'id');
}
}
Then in your controller
$bookings = Booking::with('owner')->all(); // or get() or whatever to get
the booking list
foreach($bookings as $booking){
echo $booking->user->name; // you have access to owner fields
}
Finally i found this.
Booking model
public function room( )
{ return $this->belongsTo('App\room');
}
public function hotel( )
{
return $this->room()->with(['hotel'=> function($query){
$query->with('user');
}]);
}
BookingController
public function owner(Booking $booking ) {
return $booking->with('hotel')->get()
Next thing is Filter with owner
So I have a model called data_storage and another model entity_states
I have to fetch the record from data_storage with entity_states where entity_state has data_storage_id and state_id.
How can I use eloquent to achieve this ?.
Or Ill have to use Query builder and use innerJoin?
Update1
My Actual Query
$this->values['new_leads'] = $data_storages->with('actions','states','sla')->where('wf_id',$wfid)->get();
My data_storage modal
class data_storages extends Model
{
//
protected $fillable = ['layout_id','member_id','company_id','team_id','data','status','wf_id'];
function actions()
{
return $this->hasMany('App\Models\ActionDataMaps', 'data_id', 'id' );
}
function states()
{
return $this->hasOne('App\Models\workflow_states','id','status');
}
function sla()
{
//Here I have to get those row from entity_states model where , data_storage_id and state_id
}
}
Thanks
Here's the more reasonable way to do it:
class DataStorage extends Model {
public states() {
return $this->belongsToMany(State::class,"entity_states");
}
}
class State extends Model {
public storages() {
return $this->belongsToMany(DataStorage::class,"entity_states");
}
}
Then you can eager-load related models via e.g.:
$storage = DataStorage::with("states")->first();
$storage->states->first()->column_in_related_state;
Or via the state:
$state = State::with("storages")->first();
$state->storages->first()->column_in_related_storage;
If there are additional columns in the pivot table entity_states then you can refer to them in the relationship as e.g.:
public states() {
return $this->belongsToMany(State::class)->withPivot("pivot_column");
}
In your model data_storage you can define a property / method entity_states to get them:
class data_storage extends Model
{
public function entity_states()
{
return $this->hasMany('App\entity_states','data_storage_id')->where('state_id ','=',$this->table());
}
}
Then you can access them in an instance by
$entityStatesOfDataStorage = $yourDataStorageInstance->entity_states;
See this link:
https://laravel.com/docs/5.3/eloquent-relationships
for Query Builder you may use this:
DB::table('data_storage')
->join('entity_states','data_storage.data_storage_id','=','entity_states.state_id')
->get();
For your reference Laravel Query Builder
I'm new to Laravel and I'd like to know how to use eloquent model to join a max(date) record...
App\SchemasGroup::find(7)->schemas()->get()->max('schemasVersion')->get();
I find a group of schemas (schemas_groups table) based on ID, then get the schemas from that group (schemas table), and I want to join the 'date' and 'version' field from schemas_versions table with the last version (so, max date or version field) ...
Relations are defined as:
class SchemasGroup extends Model
{
public function schemas() { return $this->hasMany('App\Schema'); }
}
class Schema extends Model
{
public function group() { return $this->belongsTo('App\SchemasGroup'); }
public function versions() { return $this->hasMany('App\SchemasVersion'); }
}
class SchemasVersion extends Model
{
public function schema() { return $this->belongsTo('App\Schema'); }
public function updatedBy() { return $this->belongsTo('App\User','updated_by'); }
}
Getting the user name who updated that last version would also be lovely...
Apparently it was easy with defining chaining models.
class Schema extends Model
{
public function group() { return $this->belongsTo('App\SchemasGroup'); }
public function versions() { return $this->hasMany('App\SchemasVersion'); }
public function latestVersion() { return $this->hasOne('App\SchemasVersion')->latest(); }
}
and then fetching the data with:
App\SchemasGroup::with('schemas.latestVersion.updatedBy')->find($schemaGroupId);
Consider the following table structure:
user table
id
name
lang_region_id
lang_region table
id
lang_id
region_id
lang table
id
name
region table
id
name
Fairly new to the Laravel framework, but trying to setup Eloquent models and relationships to an existing database. I want to establish the relationship between my user model and the lang and region models. The lang_region table defines what language and region combinations are available and then we can link each user to a valid combination.
I have read through the Laravel documentation several times looking for the proper relationship type, but is seems that the Many to Many and Has Many Through relationships are close, but since our user.id isn't used in the intermediate table I may be out of luck.
Sorry for the amateur question, but just getting used to Laravel and ORMs in general.
I would use the lang_region table as both a pivot table and a regular table with its own model.
class LangRegion extends model
{
protected $table = 'lang_region';
public function language()
{
return $this->belongsTo(Language::class, 'lang_id');
}
public function region()
{
return $this->belongsTo(Region::class);
}
public function users()
{
return $this->hasMany(User::class);
}
}
class User extends model
{
protected $table = 'user';
public function langRegion()
{
return $this->belongsTo(LangRegion::class);
}
}
class Language extends model
{
protected $table = 'lang';
public function regions()
{
$this->belongsToMany(Region::class, 'lang_region', 'lang_id', 'region_id');
}
public function users()
{
$this->hasManyThrough(User::class, LangRegion::class, 'lang_id', 'lang_region_id');
}
}
class Region extends model
{
protected $table = 'region';
public function languages()
{
$this->belongsToMany(Language::class, 'lang_region', 'region_id', 'lang_id');
}
public function users()
{
$this->hasManyThrough(User::class, LangRegion::class, 'region_id', 'lang_region_id');
}
}
If I understand what you want correctly:
class User extends Model {
private function lang_region() {
return $this->hasOne(LangRegion::class)
}
public function lang() {
return $this->lang_region()->lang();
}
public function region() {
return $this->lang_region()->region();
}
}
class LangRegion extends Model {
public function lang() {
return $this->belongsTo(Lang::class);
}
public function region() {
return $this->belongsTo(Region::class);
}
}