I have 4 tables as below:
class Job extend Model
{
public function candidates()
{
return $this->hasMany(App\Models\Candidate::class);
}
}
=========================================================
class Candidate extend Model
{
public function skills()
{
return $this->belongsToMany(App\Models\Skill::class);
}
public function job()
{
return $this->belongsTo(\App\Models\Job::class);
}
}
So, when I delete a job. I want to delete all candidates who apply to this job also. But, When I delete I got this message
SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`evaluation_db`.`candidate_skill`, CONSTRAINT `candidate_skills_candidate_id_foreign` FOREIGN KEY (`candidate_id`) REFERENCES `candidates` (`id`)) (SQL: delete from `candidates` where `candidates`.`job_id` = 39 and `candidates`.`job_id` is not null)
I think, it because of skills relation inside candidate class. Could any one help me out? I really appreciate with your help.
Thank you!
You need to define the behaviour in your migration.
Doc : https://laravel.com/docs/8.x/migrations#foreign-key-constraints
$table->foreignId('user_id')
->constrained()
->onUpdate('cascade')
->onDelete('cascade');
Delete child row when parent delete (DeleteWithRelation)
Delete all customers (children) when deleting company (parent)
$companyDetails = Company::find($companyId);
if (!$companyDetails) {
return "Company Not Found.";
}
$companyDetails->customers()->delete();
$companyDetails->delete();
Related
My tables structure is :
Shopsidname
Productsidnameshop_id
Product_tagsidlabelvalueproduct_id
Problem is: I want to delete products and product tags on deleting shop
I made two Observers and registered both :
ShopObserver
ProductObserver
ShopObserver :
public function deleting(Shop $shop)
{
$shop->products()->delete();
}
ProductObserver :
public function deleting(Product $product)
{
$product->tags()->delete();
}
But I have following error :
"SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`tabadolha`.`product_tags`, CONSTRAINT `product_tags_product_id_foreign` FOREIGN KEY (`product_id`) REFERENCES `products` (`id`)) (SQL: delete from `products` where `products`.`shop_id` = 26 and `products`.`shop_id` is not null)"
I don't want to use nullOnDelete on my database. I want to delete it by observer.
Any way?
The problem is that your second observer of tags should be fired FIRST, and you can't specify the order of observers in Laravel.
What I would to is delete the tags in the same ShopObserver, before deleting the products, and not create a separate ProductObserver.
Something like:
$shop->products->each(function($product) {
$products->tags()->delete();
});
$shop->products()->delete();
Please test, not sure about the syntax, typed it with phone from my memory :)
I have a table that looks like this
ContractorDocuments Documents Documents_Category
user_id id id
documents_id documents__category_id name
I tried the following in my ContractorDocuments Model however it is always returning the first Document Category only.
public function Documents_Category() {
return $this->hasOneThrough(Documents_Category::class, Documents::class, 'documents__category_id', 'id', 'documents_id','documents__category_id');
}
documents__category_id == foreign key on Documents Table
id = foreign key on owners table(Documents_Category)
documents_id = local key on owners table(ContractorDocuments)
documents__category_id = local key on Documents table
Would appreciate any help. Thank you!
From ContractorDocuments to Documents_Category, you don't need hasOneThrough relationship since ContractorDocuments can only have one Documents_Category through belongsTo().
// ContractorDocuments model
public function documents()
{
return $this->belongsTo(Documents::class, 'documents_id');
}
And
// Documents model
public function documents_category()
{
return $this->belongsTo(Documents_Category::class, 'documents__category_id');
}
You can just call
$contractorDocuments->documents->documents_category;
I'm getting this error whenever i try to sync an array of inputs to a pivot table:
Illuminate\Database\QueryException
SQLSTATE[23503]: Foreign key violation: 7 ERROR: insert or update on table "items_option_parcel"
violates foreign key constraint "items_option_id_fk_2971521" DETAIL: Key (items_option_id)=(0) is not present in table "items_options". (SQL: insert into "items_option_parcel" ("items_option_id", "parcel_id") values (0, 168))
here is a line of my controller:
$parcel->parcel_options()->sync($request->input('parcel_options', []));
function in the first model:
public function parcelOptionsParcels()
{
return $this->belongsToMany(Parcel::class);
}
function in the 2nd model:
public function parcel_options()
{
return $this->belongsToMany(ItemsOption::class);
}
I found out the issue, i checked my pluck() function, i forgot to pluck the items options ID with their SKUs, that's why every time it says a 0 id is not present in the table because it wasn't getting fetched at all.
I changed this:
$parcel_options = ItemsOption::all()>pluck('item_option_sku')>prepend(trans('global.pleaseSelect'), '');
to this
$parcel_options =
ItemsOption::all()->pluck('item_option_sku','id')->prepend(trans('global.pleaseSelect'), '');
I am attempting to integrate social logins with my existing laravel app. I am attempting to change email and password to nullable but I also need email to remain unique. On executing my migration I am getting an error for duplicate key name 'users_email_unique'
Laravel 5, already fixed the issue with enum I had for altering a column.
Schema::table('users', function (Blueprint $table) {
$table->string('email')->unique()->nullable()->change();
$table->string('password')->nullable()->change();
});
Illuminate\Database\QueryException : SQLSTATE[42000]: Syntax error or access violation: 1061 Duplicate key name 'users_email_unique' (SQL: alter table users add unique users_email_unique(email))
Exception trace:
1 Doctrine\DBAL\Driver\PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1061 Duplicate key name 'users_email_unique'")
/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:119
2 PDOException::("SQLSTATE[42000]: Syntax error or access violation: 1061 Duplicate key name 'users_email_unique'")
/vendor/doctrine/dbal/lib/Doctrine/DBAL/Driver/PDOStatement.php:117
Edit
If I remove Unique() from email, will it remain unique since that was previously set in a different migration?
You can change the uniqueness behaviour in a new migration by following below:
public function up()
{
Schema::table('contacts', function (Blueprint $table) {
$table->dropUnique(['email']);
});
}
/**
* Reverse the migrations.
*
*/
public function down()
{
Schema::table('contacts', function (Blueprint $table) {
$table->string('email')->unique()->change();
});
}
The Nullable() attribute will stay with the email column, since it was created with it.
It sound like the database is detecting a repeated value. That's impossible with nulls, so it could be an empty string maybe.
If that's the case, you can write a mutator function in your model to check if the value is empty and, set it to null before it goes to the database engine, like this:
public function setNameOfYourAttribute($value) {
if ( empty($value) ) {
$this->attributes['nameofyourattribute'] = NULL;
}
}
Hope it helps.
NOTE:
Full Documentation
Figured this out myself, as mentioned in the comment on the above answer.
Simply because the table was already created with unique() if I remove that it will allow the migration and will also persist the unique() functionality that was in the original User table migration.
whenever I try to delete an artist with the related song in the child table.
it returns this error.
QueryException in Connection.php line 647:
SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`laravel`.`artist_song`, CONSTRAINT `artist_song_artist_id_foreign` FOREIGN KEY (`artist_id`) REFERENCES `artists` (`id`)) (SQL: delete from `artists` where `id` = 1)
this is what I want. to protect the parent table, but what I want is to make the end user see a message saying like this "yOU CAN NOT DELETE AN ARTIST WITH RELATED SONGS PLEASE DELETE ALL SONGS OF THIS ARTIST, FIRST'. so how can I catch this with the custom exception?
I don't think you need to rely here on database exception. When someone chooses deleting artist you should verify whether artist has any songs and if yes, you should then redirect with message.
Assuming you have in Artist model relationship defined like this:
public function songs()
{
return $this->hasMany(Song::class);
}
in controller you could use code like this:
public function destroy($artistId)
{
$artist = Artist::findOrFail($artistId);
if ($artist->songs()->count()) {
return redirect()->back()->with('message','You cannot delete ...');
}
$artist->delete();
return redirect()->route('artists.index');
}