Creating Simple Quiz Logic in Laravel - laravel

These are my Schema Tables
Schema::create('question', function(Blueprint $table) {
$table->increments('id');
$table->text('title');
$table->string('hint')->nullable();
$table->text('explanation')->nullable();
$table->string('referencematerial')->nullable();
$table->string('imagepath')->nullable();
$table->boolean('published')->default(1);
$table->timestamps();
$table->softDeletes();
});
Schema::create('answers', function(Blueprint $table) {
$table->increments('id');
$table->string('text');
$table->boolean('iscorrect')->nullable();
$table->timestamps();
});
Here is my Classes for Question and Answer.
class Answer extends Model
{
protected $table = 'answer';
public $timestamps = true;
protected $fillable = array('text', 'iscorrect');
public function Question()
{
return $this->belongsTo('Question');
}
}
class Question extends Model
{
protected $table = 'question';
public $timestamps = true;
protected $dates = ['deleted_at'];
protected $fillable = array('title', 'hint', 'explanation', 'referencematerial', 'imagepath', 'published');
public function Answer()
{
return $this->hasMany('Answer');
}
}
My QuizController
public function index()
{
$questions = Question::with('answers')->get();
return $questions;
}
BadMethodCallException in Builder.php line 2251:
Call to undefined method Illuminate\Database\Query\Builder::answers()
I have been trying to load the questions and answers on the page. It keeps giving me query builder error. Please feel free to chime into it.

The error is basically telling you that the relationship you have called (answers) doesn't exist.
You have called the relationship Answer() in your model but referenced it as answers in your query.
You either need to update the relationship in your model to answers() or change the query to $questions = Question::with('Answer')->get();
Update
Your relationship isn't calling the model correctly, it should be:
public function Answer()
{
return $this->hasMany('App\Answer');
}

Related

laravel 8 update child table data from parent table

I'm working on a Laravel 8 project.
I have a payments table, it's the migration:
Schema::create('payments', function (Blueprint $table) {
$table->id();
$table->enum('gateway',['idpay','zarinpal']);
$table->unsignedInteger('res_id')->nullable();
$table->char('ref_code',128)->nullable();
$table->enum('status',['paid','unpaid']);
$table->unsignedBigInteger('order_id');
$table->foreign('order_id')->references('id')->on('orders')->onDelete('cascade');
$table->timestamps();
});
as you can see this table has a foreign key that references on orders table, and it is orders migration:
Schema::create('orders', function (Blueprint $table) {
$table->id();
$table->unsignedInteger('amount');
$table->char('ref_code',128)->nullable();
$table->enum('status',['unpaid','paid',]);
$table->unsignedBigInteger('user_id');
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
$table->timestamps();
});
I created a one to one relationship in Order model:
class Order extends Model
{
use HasFactory;
protected $guarded = [];
public function payment()
{
return $this->hasOne(Payment::class);
}
}
The problem is that when I want to use order() method on Payment class it does not work.
for example:
Payment::find(10)->order()->update(['status' =>'paid']);
I get this error:
BadMethodCallException Call to undefined method
App\Models\Payment::order()
UPDATE:
Here is Payment model:
class Payment extends Model
{
use HasFactory;
protected $guarded = [];
}
Thank you for helping me.
You should use like this a method in the payment model.
public function order()
{
return $this->belongsTo(Order::class);
}
Because you still don't have any relationship in the payment model to order.
You can check here for detailed information.
https://laravel.com/docs/8.x/eloquent-relationships#one-to-one-defining-the-inverse-of-the-relationship
You have to describe the order relation ship in the Payment model
class Payment extends Model
{
use HasFactory;
protected $guarded = [];
public function order()
{
return $this->belongsTo(Order::class);
}
}
and after that you can access the payment's order like this:
Payment::find(10)->order->update(['status' =>'paid']);

Company::find(1)->departments returns null from relationship issues

I am making a few tables having one to many relationships and I also have one to one relationships but if I solve this why it is not working maybe I can solve one to one as well.
I will provide some codes for you to have a look at.
when I go to tinker and type like "Company::find(1)->deparments", it returns null. when I check the database, foreign key is correctly added.
I also set the primary key in model.
Company table
public function up()
{
Schema::create('companies', function (Blueprint $table) {
$table->bigIncrements('company_id');
$table->string('phone');
$table->string('company_name',100);
$table->timestamps();
});
}
Department Table
public function up()
{
Schema::create('departments', function (Blueprint $table) {
$table->bigIncrements('department_id');
$table->unsignedBigInteger('company_id');
$table->foreign('company_id')->references('company_id')->on('companies')->onDelete('cascade');
$table->string('department_name',100);
$table->timestamps();
});
}
Company Model
protected $primaryKey = 'company_id';
Protected $table='companies';
Protected $fillable=['phone','company_name'];
public function users()
{
return $this->hasMany(User::class,'user_id');
}
Department Model
protected $primaryKey = 'department_id';
protected $table = 'departments';
protected $fillable = ['department_name'];
public function company()
{
return $this->belongsTo(Company::class,'company_id');
}
public function users()
{
return $this->hasMany(User::class,'department_id');
}
You missed the department relationship in Company Model inorder to call this command.
public function departments()
{
return $this->hasMany(Department::class,'department_id');
}
I think it should be like this after creating relationship,
Company::with(['deparments'])->findOrFail(1);
Hope this helps :)

Laravel Relations, Models and Migrations

I have a problem with my relations in laravel:
I have two tables, Languages and Customers.The customer just can have 1 language. These are my migrations and Models:
Migrations:
Schema::create('tbl_customers', function (Blueprint $table){
$table->increments('id');
$table->string('first_name',255);
$table->string('last_name',255);
$table->date('date_of_birth');
$table->string('email',255);
$table->string('phone_number',255);
$table->string('phone_number2',255);
$table->string('password', 255);
$table->unsignedInteger('dealer_id');
$table->string('picture_profile',255);
$table->string('occupation',255);;
//Foreign key
$table->unsignedInteger('language_id');
$table->string('about_me',255);
});
Schema::create('tbl_languages', function (Blueprint $table){
$table->increments('id');
$table->string('language',255);
});
This is the foreign Key:
Schema::table('tbl_customers', function (Blueprint $table){
$table->foreign('language_id')->references('id')
->on('tbl_languages')->onDelete('cascade');
});
These are my Models.
Customer:
class Customer extends Model{
protected $table='tbl_customers';
protected $primaryKey="id";
protected $fillable=['address_id','first_name','last_name','gender_id','date_of_birth','email','phone_number','phone_number2',
'dealer_id','picture_profile','occupation','time_zone_id','language_id','about_me'];
protected $hidden=['password'];
public $timestamps = false;
public function language(){
return $this->hasMany(Language::class);
}}
Language
class Language extends Model{
protected $table='tbl_languages';
protected $primaryKey="id";
protected $fillable=['language'];
public $timestamps=false;
public function customers(){
return $this->belongsToMany(Customer::class);
}}
So, If I make a query I have the next error:
error
why? If the migrations have the standard that Laravel says
If I change the Customer model like this:
public function language(){
return $this->hasMany(Language::class,'id','language_id');
}
It works good, but Languages no.
I wish you guys can help me.
add this to your Customer model:
public function language(){
return $this->belongsTo('App\Language');
}
and this to your Language model:
public function customers(){
return $this->hasMany('App\Customer');
}

Laravel BelongsToMany Error - Base table or view not found

I hope this thread find everyone healthy.
What is wrong with the following code? I am getting an error on my many to many relationship. For the past 4 hours i am stuck with this problem. I would be very thankful if you find the bug or source of problem.
Here is my code and tables:
Schema::create('products', function(Blueprint $table)
{
$table->increments('id');
$table->integer('category');
$table->string('thumbnail');
$table->string('images');
$table->string('logo');
$table->string('main_photo');
$table->timestamps();
});
//categories table
Schema::create('product_categories', function(Blueprint $table)
{
$table->increments('id');
$table->string('category');
});
//relationship table
Schema::create('product_productcategory', function(Blueprint $table)
{
$table->increments('id');
$table->integer('product_id'); // the id of the bear
$table->integer('productcategories_id'); // the id of the picnic that this bear is at
});
products model:
class Product extends Model
{
protected $table = 'products';
public function product_category() {
return $this->belongsToMany('App\product_category', 'App\product_productcategory', 'product_id', 'productcategories_id');
}
}
And pivot model
class product_category extends Model
{
protected $table = 'product_categories';
public function product() {
return $this->belongsToMany('App\Product', 'App\product_productcategory', 'productcategories_id', 'product_id');
}
}
Thanks in advance!
Updates: The problem is solved thanks to #mimo.
But now i want to translate the categories in different languages so i created a table like this:
Schema::create('category_translations', function(Blueprint $table)
{
$table->increments('id');
$table->string('name');
$table->integer('category_id')->unsigned();
$table->foreign('category_id')->references('id')->on('product_categories')->onDelete('cascade');
$table->integer('locale_id')->unsigned();
$table->foreign('locale_id')->references('id')->on('locales')->onDelete('cascade');
$table->unique(['category_id', 'locale_id']);
});
And my product categories with new relationship to the translations
class product_category extends Model
{
protected $table = 'product_categories';
public function product() {
//return $this->belongsToMany('App\Product', 'App\product_productcategory', 'productcategories_id', 'product_id');
return $this->belongsToMany('App\Product', 'product_productcategory');
}
public function translation($lang) {
return $this->hasMany('App\Category_Translation')->where('locale_id', '=', $lang);
}
}
And in category translation:
class Category_Translation extends Model
{
protected $table = 'category_translations';
public function product_category() {
return $this->belongsTo('App\product_category');
}
}
And finally my Product:
class Product extends Model
{
protected $table = 'products';
public function translation($lang) {
return $this->hasMany('App\Product_Translation')->where('locale_id', '=', $lang);
}
public function product_category() {
//return $this->belongsToMany('App\product_category', 'App\product_productcategory', 'product_id', 'productcategories_id');
//return $this->belongsToMany('App\product_category', 'product_productcategory');
return $this->belongsToMany('App\product_category', 'product_productcategory')->translation(1);
}
}
Now when i run:
$product = App\Product::find(1)->first();
echo $product->product_category;
I get error:
Call to undefined method Illuminate\Database\Query\Builder::translation()
Your migration file is wrong:
//relationship table
Schema::create('product_productcategory', function(Blueprint $table)
{
$table->integer('product_id')->unsigned()->index(); // the id of the bear
$table->foreign('product_id')->references('id')->on('products');
$table->integer('productcategories_id')->unsigned()->index(); // the id of the picnic that this bear is at
$table->foreign('productcategories_id')->references('id')->on('product_categories');
});
This code will made the relationship on the database level.
When you have 12 min free time you can check out this tutorial about many to many relationships in laravel:
https://laracasts.com/series/laravel-5-fundamentals/episodes/21
Update:
you need to update your relationships too:
class Product extends Model
{
protected $table = 'products';
public function product_category() {
return $this->belongsToMany('App\product_category', 'product_productcategory');
}
}
and:
class product_category extends Model
{
protected $table = 'product_categories';
public function product() {
return $this->belongsToMany('App\Product', 'product_productcategory');
}
}

Laravel: Eloquent Relationship error

I have a many to many relationship between products and a product_categories tables. Now I want to create a translation table for categories.
But how do I relate them in eloquent? i am learning database relationships so forgive my ignorance.
Here is my tables:
//languages
Schema::create('locales', function(Blueprint $table)
{
$table->increments('id');
$table->string('code', 2);
$table->string('name');
});
//products
Schema::create('products', function(Blueprint $table)
{
$table->increments('id');
$table->string('thumbnail');
$table->timestamps();
});
//categories
Schema::create('product_categories', function(Blueprint $table)
{
$table->increments('id');
$table->string('category');
});
//relationship table
Schema::create('product_productcategory', function(Blueprint $table)
{
$table->integer('product_id')->unsigned()->index(); // the id of the bear
$table->foreign('product_id')->references('id')->on('products');
$table->integer('product_category_id')->unsigned()->index(); // the id of the picnic that this bear is at
$table->foreign('product_category_id')->references('id')->on('product_categories');
});
//category translations
Schema::create('category_translations', function(Blueprint $table)
{
$table->increments('id');
$table->string('name');
$table->integer('category_id')->unsigned();
$table->foreign('category_id')->references('id')->on('product_categories')->onDelete('cascade');
$table->integer('locale_id')->unsigned();
$table->foreign('locale_id')->references('id')->on('locales')->onDelete('cascade');
$table->unique(['category_id', 'locale_id']);
});
Product Model:
class Product extends Model
{
protected $table = 'products';
public function product_category() {
return $this->belongsToMany('App\product_category', 'product_productcategory')->translation(1);
}
}
Product categories:
class product_category extends Model
{
protected $table = 'product_categories';
public function product() {
return $this->belongsToMany('App\Product', 'product_productcategory');
}
}
Category Translations
class Category_Translation extends Model
{
protected $table = 'category_translations';
public function product_category() {
return $this->belongsTo('App\product_category');
}
}
But when i run:
$product = App\Product::find(1)->first();
echo $product->product_category;
I get error:
Call to undefined method Illuminate\Database\Query\Builder::translation()
You should not call translation in the Product model category relation (because you still interacting with the query builder), instead you should access the translation as a property on the category object:
echo $product->product_category->first()->getTranslatedIn(1)->name;
So you could refactor your code like this:
Product Model:
class Product extends Model
{
protected $table = 'products';
public function product_category() {
return $this->belongsToMany('App\product_category', 'product_productcategory');
}
}
Product categories:
class product_category extends Model
{
protected $table = 'product_categories';
public function product() {
return $this->belongsToMany('App\Product', 'product_productcategory');
}
public function translations() {
return $this->hasMany('App\Category_Translation', 'category_translations');
}
// relation filtered by language (cannot be accessed as a property unless you define the parameter as optional)
public function translatedIn($language) {
return $this->hasOne('App\Category_Translation', 'category_id')->where('locale_id', $language);
}
// access translated object
public function getTranslatedIn($language) {
return $this->translatedIn($language)->getResults();
}
}

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