Project model
namespace App;
use Illuminate\Database\Eloquent\Model;
class Project extends Model
{
protected $table = 'project';
protected $primaryKey = 'project_id';
}
Developer model
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Developer extends Model
{
protected $table = 'developer';
protected $primaryKey = 'id';
}
I want to join this two model as the SQL below :
SELECT developer.developer_name, count(project.dev_id)
FROM project
JOIN developer ON developer.id = project.dev_id
GROUP BY developer.developer_name
Can someone help me? I am confused when looked through different documentation.
Please guide me the correct way.
Create a projects relation in Developer model.
public function projects()
{
return $this->hasMany(\App\Project::class, 'dev_id')
}
Then you can get all developers with number of projects they are handling using
Developer::withCount('projects')->get();
You can do this using below query and also you can do this by eloquent query for this you have to define relationship in model.
DB::table('project')
->join('developer', 'project.dev_id', '=', 'developer.id')
->select('developer.developer_name', DB::raw("count(project.dev_id) as count"))
->groupBy('developer.developer_name')
->get();
Related
I have a navigation model that can have many items associated with it:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
use JetBrains\PhpStorm\ArrayShape;
use Laravel\Scout\Searchable;
class Navigation extends Model
{
use HasFactory;
use Searchable;
protected $guarded = [];
public function navigation_items(): HasMany
{
return $this->hasMany(NavigationItem::class);
}
}
The navigation item model looks like this
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\MorphTo;
class NavigationItem extends Model
{
use HasFactory;
protected $guarded = [];
public function navigation(): BelongsTo
{
return $this->belongsTo(Navigation::class);
}
public function navigatable(): MorphTo
{
return $this->morphTo();
}
}
Now an item can either be of type Page or Blog, in this case the Page model looks like this:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\MorphOne;
use JetBrains\PhpStorm\ArrayShape;
use Laravel\Scout\Searchable;
class Page extends Model
{
protected $guarded = [];
public function navigatable(): MorphOne
{
return $this->morphOne(NavigationItem::class, 'navigatable');
}
}
When I try to save a navigation model and associate it with a item, the following error appears:
SQLSTATE[HY000]: General error: 1364 Field 'navigatable_type' doesn't have a default value
I save the model like this:
foreach ($this->selected as $id) {
$this->navigation->navigation_items()->create([
'navigation_id' => $this->navigation->id,
]);
Where $this->selected is the navigation id, it should automatically get the correct navigatable_type and navigatable_id, but this doesn't seem to be working.
passing in the type and id manually works, but this kinda defeats the point of a polymorphic relationship.
any ideas?
On NavigationItem model, since you defined polymorphic relation as 'navigatable' it is expected that NavigationItem model's table contains navigatable_type and navigatable_id. First please ensure this checks out.
Creating records through relation's base function is not a valid method. It is not clear what you are trying to achieve there but when you want to set relation there is two standard way of achieving it:
1- Associate
When a relation is defined as belongsTo, you may use associate() function. Like so:
$account = Account::find(10);
$user->account()->associate($account);
2- Attach
Attach is used when relation is defined belongsToMany (pivot). It allows you to attach multiple records to a model instance/record.
$user = User::find(1);
$user->roles()->attach($roleId);
So if you want to set a 'navigatable' to a Navigation instance, you may:
$somePageInstance=Page::find(55);
$nagivation->navigatable()->associate($somePageInstance)
$nagivation->save();//remember to save, otherwise it won't be
I have two tables in MySql datebase:
person('id', 'name', 'address')
car('id', 'person_id', 'name')
I join them with this query:
$data = DB::table('person')->join('car', 'person.id', '=', 'car.person_id')->get(); return view('view1',['data'=>$data]);
in view1 we have:
person name: {{$data->name}}
car name: {{$data->name}}
the question is how can I show these two fields in view1?
notice that I can't change the fields name to two different names in my case.
I suggest you to create models for each table using php artisan commands
php artisan make:model Person
Person model look like below
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
class Person extends Model
{
use HasFactory;
protected $table = "person";
public function cars()
{
return $this->hasMany(Car::class);
}
}
Similarly create car model
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
class Car extends Model
{
use HasFactory;
protected $table="car";
}
To Fetch you can do like this
$person=Person::with('cars')->get();
So you don't need alias
$data = DB::table('person')->select('car.name as carName','person.name as personName') ->join('car', 'person.id', '=', 'car.person_id')->get();
Hello guys I am working on a laravel project for making api for passing the database value in json format but the problem is I have a users table in this table 2 ids 1 is primary key and second is business _id I want to get data according to business_id but it's getting data by id please help me how to solve this issue.
Here is my model code
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class user extends Model
{
protected $table = 'business';
}
Here is my Controller Code
<?php
namespace App\Http\Controllers;
use Illuminate\Http\Request;
use App\user;
class GetController extends Controller
{
public function databybusinessid($business _id){
$users = new user();
$users = user::find($business _id);
return response()->json($users);
}
}
Thank you so much
You are using user::find($business _id)
find() method will automatically search by the primary key but none is defined in your model and Eloquent can't decide which one to pick from your table. Therefore, you should explicitly set your primary key in your model by adding the following line.
class user extends Model
{
protected $table = 'business';
protected $primaryKey = 'business_id';
}
If in doubt, you can also fetch database record by a specific column using where
$users = user::where('business_id', '=', $business _id)->get()
Laravel documentation about Eloquent ORM
https://laravel.com/docs/5.8/eloquent
find() Retrieve a model by its primary key..
So you have to use your code as:
$users = user::where('business_id',$business_id)->first();
// Notice first() Retrieve the first model matching the query constraints...
Or you can change your primary code in model
namespace App;
use Illuminate\Database\Eloquent\Model;
class user extends Model
{
protected $table = 'business';
protected $primaryKey = 'business_id';
}
find() works only on primary key. you need to use where instead.
or you can define business_id as primary key in your User model.
protected $primaryKey = 'business_id';
public function databybusinessid($business _id){
$users = new user();
$users = user::where('business_id',$business _id)->first();
return response()->json($users);
}
I want to join three tables. Here is the DB model in server:
lecturers
id - integer (PK)
......
examination
id - integer (PK)
.....
exam_supervision
lecturer_id - integer (FK)
exam_id- integer (FK)
Model relation as I implemented in laravel.
```
<?php namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Examsupervision extends Model {
public $timestamps = false;
protected $table = 'exam_supervision';
protected $fillable = ['lecturer_id', 'exam_id'];
}
<?php namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Examination extends Model {
public $timestamps = false;
protected $table = 'examination';
protected $fillable = ['name', 'module_id', 'startdate', 'enddate', 'duration', 'type', 'code', 'status'];
}
<?php namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Lecturers extends Model {
public $timestamps = false;
protected $table = 'lecturers';
protected $fillable = ['user_id', 'address', 'phone'];
}
```
lecturers, examinations and exam_supervision which is M:M. What I want is find all the examinations of a lecturer.
My code
public function lecturerViewExaminations($id)
{
what code to get all exam for a lecturer..say ID 129
}
Returning me empty set. WHat am I doing wrong? It is easy in SQL syntax but in laravel I am finding it very confusing
What i understand from your question is:
You have one model (Examsupervision) and want the relations examinations and lectures
You can use Eloquent: Relationships
First create a model. In this case your model name would be something like Examsupervision.
In your model(Examsupervision) you can define your relations. In this case examinations and lextures
Create for every relation a new model. So you will have 3 models (Examsupervision, Examinations, Lectures).
Now in your model Examsupervision create a new relation function.
public function lectures()
{
return $this->hasMany('App\Lectures');
}
public function examinations(){
return $this->hasMany('App\Examinations');
}
In your database table "lectures" and "examinations" create a new key with the name examsupervision_id. This key will be the id of the Examsupervision row.
Now in your code when you want the get all the lectures of a given Examsupervision you can do this.
$examsupervision = Examsupervision::find($id); //$id = the Examsupervision you want to retrieve
$lectures = $examsupervision->lectures; //This will return all the lectures connected to examsupervision
And for examinations you can do the same with:
$examsupervision = Examsupervision::find($id); //$id = the Examsupervision you want to retrieve
$examinations = $examsupervision->examinations;
Hope this helps
You are missing ->get() after the last where.
$examinations= Examsupervision::with('lecturers', 'examinations')->where('lecturer_id', 'id')->where('exam_id', 'id')->get();
Model::with() is for relation, Use just ->get()
$examinations=Examsupervision::with('lecturers', 'examinations')->get();
You already have relation for lecturers and examinations.
If not worked, share Model Examsupervision
I have the database structure that have a classes table, a users table and users_classes table that matches the other two, because a user can belong to multiple classes. I have a problem now. I have code like this:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Facades\DB;
class Classes extends Model
{
protected $table = 'classes';
public function students()
{
}
}
And I want to be able to access the students of the class by typing $class = Classes::find(1) and then $class->students to access the students. How do I define the relationship without using the query builder? I want to use eloquent. Im a noobie in Laravel pls dont downvote.
You use a belongsToMany relation.
If your users_classes table has the fields user_id and class_id you can do the following:
public function students()
{
return $this->belongsToMany(Student::class, 'users_classes', 'class_id', 'user_id');
}