I have a School model that has many Student models who attend to multiple Lesson models, I also have a controller for each one.
I need the ability to access the school type (large, small, etc...), whether I am in the Student, Lesson or School controller.
Would this approach be correct in a strict OOP world?
// School model
class School
{
...
public getSchoolType()
{
return $this->schoolType;
{
}
// Student model
class Student
{
...
public school()
{
return $this->school;
{
}
// Lesson model
class Lesson
{
...
public student()
{
return $this->student;
{
}
// Student controller
class StudentController
{
public function show(Student $student)
{
$schoolType = $student->school->schoolType;
return view('students', array($schoolType));
}
}
// Lesson controller
class LessonController
{
public function show(Lesson $lesson)
{
$schoolType = $lesson->student->school->schoolType;
return view('lessons', array($schoolType));
}
}
If lessons relate to students in a Many-to-Many way, how do I get the schoolType within the Lesson controller if there is no students attending that Lesson?
My point is, should I actually get the schoolType through the Student model like $lesson->school->schoolType or it should be more like $lesson->student->school->schoolType, so lessons simply don't relate directly to students?
use eloquent relationship hasMany and belongsTo.
In your School Model-
public function students()
{
return $this->hasMany(Student::class);
}
In you Student model-
public function lessons()
{
return $this->hasMany(Lesson::class);
}
public function school()
{
return $this->belongsTo(School::class);
}
In your Lesson Model-
public function student()
{
return $this->belongsTo(Student::class);
}
public function school()
{
return $this->belongsTo(School::class);
}
now you can easily access schoolType as you can traverse to model to model using this relationship. An example would be, In your Lesson Controller-
$lession = Lession::find($lession_id);
$schoolType = $lession->student->school->schoolType;
If you want to access schoolType directly from Lesson-
$lession = Lession::find($lession_id);
$schoolType = $lession->school->schoolType;
Related
There are 2 tables and 2 models. Table "games" has 2 foreign keys "team_a_id" and "team_b_id"
I try to define relationship but can't understand how build this relationship. One game can have only one team A and only one team B. But one team can have many games.
At this moment I have
class Game extends Model
{
public function teamA()
{
return $this->hasOne('App\Models\Team', 'team_a_id');
}
public function teamB()
{
return $this->hasOne('App\Models\Team', 'team_b_id');
}
}
and
class Team extends Model
{
public function gameTeamA()
{
return $this->belongsTo('App\Models\GameSerie', 'team_a_id');
}
public function gameTeamB()
{
return $this->belongsTo('App\Models\GameSerie', 'team_b_id');
}
}
I have to define relationship in order to find all games where team was team_a or team_b.
e.g.
$allGames = $team->games($id);
Also i am not sure that i defined relationships right
It's the other way around. The model with the foreign key has the BelongsTo relationship:
class Game extends Model
{
public function teamA()
{
return $this->belongsTo('App\Models\Team', 'team_a_id');
}
public function teamB()
{
return $this->belongsTo('App\Models\Team', 'team_b_id');
}
}
class Team extends Model
{
public function gameTeamA()
{
return $this->hasOne('App\Models\GameSerie', 'team_a_id');
}
public function gameTeamB()
{
return $this->hasOne('App\Models\GameSerie', 'team_b_id');
}
}
I have a recently started learning Laravel 5.4, I am having trouble with my 3 way table relationship, I've looked at a few articles online regarding many to many, but this relationship is just a "hasOne" on both sides.
Could anyone give me a helpful hint as to how to structure my table relationship, here is the PK/FK relationship:
Users table (id)
Listings table (id, user_id)
Insights table (id, listing_id) - one insight row per listing only.
And the models below:
Users Model
class User extends Model
{
public function listing()
{
return $this->belongsTo('App\Listing');
}
}
Listing Model
class Listing extends Model
{
public function insight()
{
return $this->hasOne('App\Insight');
}
}
Insight Model
class Insight extends Model
{
public function listing()
{
return $this->hasOne('App\Listing');
}
}
And what I am trying to achieve is to query the users own listings, with each listings current insights.
Thanks a bunch.
Simon.
User model
class User extends Model
{
public function listing()
{
return $this->hasOne('App\Listing');
}
}
Listing Model
class Listing extends Model
{
public function insight()
{
return $this->hasOne('App\Insight');
}
public function user()
{
return $this->belongsTo('App\User');
}
}
Insight Model
class Insight extends Model
{
public function listing()
{
return $this->belongsTo('App\Listing');
}
}
And if you want query users with Listing and Insight
$users = User::with(['listing', 'listing.insight'])->get();
foreach($users as $user) {
$user->listing->insight;
}
class User extends Model
{
public function listing()
{
return $this->hasMany(Listing::class);
}
}
class Listing extends Model
{
public function insight()
{
return $this->hasOne(Insight::class);
}
public function user()
{
return $this->belongsTo(User::class);
}
}
class Insight extends Model
{
public function listing()
{
return $this->belongsTo(Listing::class);
}
}
$users = User::with('listing.insight')->get();
foreach($users as $user) {
$user->listing->insight;
}
In my Laravel application I have the following classes:
class Product extends Model
{
public function extended()
{
return $this->morphTo();
}
public function users {
return $this->belongsToMany('App\User', 'products_users', 'product_id');
}
}
class Foo extends Model
{
public function product()
{
return $this->morphOne('App\Product', 'extended');
}
public function bars()
{
return $this->hasMany('App\Bar');
}
}
class Bar extends Model
{
public function product()
{
return $this->morphOne('App\Product', 'extended');
}
public function foo()
{
return $this->belongsTo('App\Foo');
}
}
class User extends Model
{
public function products()
{
return $this->belongsToMany('App\Product', 'products_users', 'user_id');
}
}
I can easily get users of a bar object using Bar::find(1)->product->users and I can also get the bars of a user with User::find(1)->products.
How can I get the users of all bars belonging to a specific foo? That is, Foo::find(1)->users should return all users that have the bars belonging to Foo with id 1. It's basically hasManyThrough with polymorphic and many-to-many relations.
Try something like this:
public function users()
{
$Foo = static::with(['bars', 'bars.products', 'bars.product.users'])->get();
return collect(array_flatten(array_pluck($Foo, 'bars.*.product.users')));
}
This should work for you (code has been tested, but not against the exact same structure as your setup). The first line will return all the users deeply nested through the relationships. The second line will pull out the users, flatten them into an array, then transform the array into a collection.
I created a HasManyThrough relationship for cases like this: Repository on GitHub
After the installation, you can use it like this:
class Foo extends Model {
use \Staudenmeir\EloquentHasManyDeep\HasRelationships;
public function users() {
return $this->hasManyDeep(
User::class,
[Bar::class, Product::class, 'products_users'],
[null, ['extended_type', 'extended_id']]
);
}
}
I have the following database tables:
Seasons
id
number
Teams
id
name
Standings
id
season_id
team_id
The question is, how could I get all of the teams in a season through the standings table. At the moment I am getting all of the teams this way:
$teams = [];
$standings = $season->standings;
foreach($standings as $standing){
$teams[] = $standing->team;
}
Is there a way I could do this using Eloquent relationships? I have tried HasManyThrough with no success. These are what my models look like currently:
class Season extends Eloquent{
public function standings(){
return $this->hasMany('Standing');
}
}
class Standing extends Eloquent{
public function team(){
return $this->belongsTo('Team');
}
}
class Team extends Eloquent{
public function standings(){
return $this->belongsToMany('Standing');
}
}
Your relationships look a little off. Here is all the relationships you should need though only the belongsToMany ones are required for this specific scenario of finding all the teams in a season.
class Season extends Eloquent {
public function teams()
{
return $this->belongsToMany('Team', 'Standings');
}
public function standings()
{
return $this->hasMany('Standing');
}
}
class Team extends Eloquent {
public function seasons()
{
return $this->belongsToMany('Season', 'Standings');
}
public function standings()
{
return $this->hasMany('Standing');
}
}
class Standing extends Eloquent {
public function team()
{
return $this->belongsTo('Team');
}
public function season()
{
return $this->belongsTo('Season');
}
}
You would use the belongsToMany relationship rather than a hasManyThrough to query all the teams in a season. That would look something like...
Season::with('teams')->find($season_id);
foreach($season->teams as $team) {
echo $team->name;
}
I have different Database tables and below is the DB Diagram.
I am trying to make a many to many polymorphic relationship, but no luck, Please guide me that what i need to do, means where i need to add which type relationship/code?
Course Model
class Course extends Eloquent {
public function quizzes()
{
return $this->morphToMany('Quiz', 'quizzable');
}
}
Chapter Model
class Chapter extends Eloquent {
public function quizzes()
{
return $this->morphToMany('Quiz', 'quizzable');
}
}
Lesson Model
class Lesson extends Eloquent {
public function quizzes()
{
return $this->morphToMany('Quiz', 'quizzable');
}
}
Quiz Model
class Quiz extends Eloquent {
public function courses()
{
return $this->morphedByMany('Course', 'quizzable');
}
public function chapters()
{
return $this->morphedByMany('Chapter', 'quizzable');
}
public function lessons()
{
return $this->morphedByMany('Lesson', 'quizzable');
}
}
Source: http://laravel.com/docs/4.2/eloquent#many-to-many-polymorphic-relations
I would change the quizzes_assigned table to:
Table name: quizzables
quiz_id - integer
quizzable_id - integer
quizzable_type - string