In my database I have 2 tables:
country(id,name)
users(id,countryid)
country ->id= users->countryid;
I'm trying to perform this task with yii relations to get name from country table :
users modals
public function relations()
{
return array(
'linkedIndex' => array(self::BELONGS_TO, 'Country','countryid'),
);
}
public function afterFind()
{
$name = Users::model()->findByPk(1);
}
if you look at this code closely, you will see that variable name is being populated,BUT after functions ends, the variable also gets destroyed,
public function afterFind()
{
$name = Users::model()->findByPk(1);
}
if you want to keep this $name, you have to make it a property of the model class (or store it in an existing property)
Related
I have a model called Tree that is supposed to be associated to 1..n Things. Things can be associated to 0..n things. In other words this is a many-to-many relationship, and a Thing must be chosen when a Tree is being created. My thing_tree migration looks like this (there's also a thing_thing pivot table but that's irrelevant):
public function up()
{
Schema::create('thing_tree', function (Blueprint $table) {
$table->id();
$table->timestamps();
$table->unsignedBigInteger('tree_id')->nullable();
$table->unsignedBigInteger('thing_id')->nullable();
$table->unique(['tree_id', 'thing_id']);
$table->foreign('tree_id')->references('id')->on('trees')->onDelete('cascade');
$table->foreign('thing_id')->references('id')->on('things')->onDelete('cascade');
});
}
My Tree model looks like this:
<?php
namespace App\Models;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
class Tree extends Model
{
use HasFactory;
protected $guarded = [];
public function path(){
$path = '/trees/' . $this->id;
return $path;
}
public function associatedThings () {
return $this->belongsToMany(Thing::class);
}
}
The Thing model looks like this:
public function trees()
{
return $this->belongsToMany(Tree::class);
}
public function parentOf (){
return $this->belongsToMany(Thing::class, 'thing_thing', 'parent_id', 'child_id');
}
public function childOf(){
return $this->belongsToMany(Thing::class, 'thing_thing', 'child_id', 'parent_id');
}
Finally, the Tree Nova resource has these fields:
public function fields(Request $request)
{
return [
ID::make(__('ID'), 'id')->sortable(),
Text::make('name'),
ID::make('user_id')->hideWhenUpdating()->hideWhenCreating(),
Boolean::make('public'),
BelongsToMany::make('Things', 'associatedThings')
];
}
It should not be possible to create a Tree without an attached Thing, but the creation screen looks like this:
How do I require this in Nova?
This is not possible through nova's default features. Here is how I would go about it with the least effort (you Might want to create a custom field for that yourself) - or at least how I solved a similar issue in the past:
1. Add the nova checkboxes field to your project
2. Add the field to your nova ressource :
// create an array( id => name) of things
$options = Things::all()->groupBy('id')->map(fn($e) => $e->name)->toArray();
// ...
// add checkboxes to your $fields
Checkboxes::make('Things', 'things_checkboxes')->options($options)
3. Add a validator that requires the things_checkboxes to be not empty
4. Add an observer php artisan make:observer CheckboxObserver that will sync the model's relations with the given id-array through the checkboxes and then remove the checkboxes field from the object (as it will throw a column not found otherwise), so something like this:
public function saving($tree)
{
// Note: In my case I would use the checkbox_relations method of the HasCheckboxes trait and loop over all checkbox relations to perform the following and get the respective array keys and relation names
$available_ids = array_unique($tree['things_checkboxes']);
// Attach new ones, remove old ones (Relation name in my case comes from the HasCheckboxes Trait)
$tree->things->sync($available_ids);
// Unset Checkboxes as the Key doesn't exist as column in the Table
unset($tree['things_checkboxes']);
return true;
}
5. Add the same thing in reverse for the retreived method in your observer if you want to keep using the checkboxes to handle relations. Otherwise, add ->hideWhenUpdating() to your checkbox field
I added a trait for that to easily attach the relations through checkboxes to a model:
trait HasCheckboxRelations
{
/**
* Boot the trait
*
* #return void
*/
public static function bootHasCheckboxRelations()
{
static::observe(CheckboxObserver::class);
}
/**
* Defines which relations should be display as checkboxes instead of
* #return CheckboxRelation[]
*/
public static function checkbox_relations()
{
return [];
}
}
And checkbox_relations holds an array of instances of class CheckboxRelation which again holds informations about the key name, the relation name and so on.
public function __construct(string $relationName, string $relatedClass, string $fieldName, bool $hasOverrides = false, string $relationType = null, array $_fields = [])
Also, I added a method attachCheckboxRelationFields to the default nova resource which will be called on the $fields when the model uses the trait.
Now, I only have to add HasCheckboxRelations to a model, add the array of checkbox_relations and thats it - I have a belongsToMany relation on the nova resource through checkboxes. Of course you don't have the option to manage pivot fields anymore if you go for it this way - which might be why it was not done by the nova devs - but for simple belongsToMany relations I really like to work with the checkbox solution instead of the default attach-table. And for data with pivot fields you can still use the default way.
Also note that parts of the code where written on the fly so it might not work out of the box, but the overall idea should be delivered.
Hope it helped!
alternative
https://github.com/Benjacho/belongs-to-many-field-nova
BelongsToManyField::make('Role Label', 'roles', 'App\Nova\Role'),
I am trying to make a one-to-many relationship, but I get the following error
Undefined property: stdClass::$client (View:
C:\wamp\www\intranet\resources\views\users\list.blade.php)
The problem is that I am working with an existing database that in the tables does not have id fields, and the foreign keys would also be the typical ones like client_id
My model Client.php
class Client extends Model
{
protected $connection = 'dpnmwin';
protected $table = 'nmundfunc';
public function employee(){
return $this->hasMany('App\Employee');
}
}
My model Employee.php
class Employee extends Model
{
protected $connection = 'dpnmwin';
protected $table = 'nmtrabajador';
public function client(){
return $this->belongsTo('App\Client', 'COD_UND');
}
}
In nmtrabajador COD_UND field would be the foreign key that relates to nmundfunc.
And I try to get the data out like this: {{$user->client->CEN_DESCRI}}.
but it does not throw me the error, how can I solve it?
My Controller where I send in sight
public function index(){
$users = DB::connection('dpnmwin')->table('nmtrabajador')->where('CONDICION', '=', 'A')->get();
return view('users.list',array(
'users' => $users
));
}
You have to call basis on relations.
This code will return you data.
If you have id then you can find by id like below
$employee=Employee::find(1);
Or if you want to fetch all data then you can call all method.
Employee::all();
And then you can just get it by relation as you define in models.
$client=$employee->client->CEN_DESCRI;
Retrieving data from the instance is based on the methods which we have use.
Here in this answer, you can get that
Property [title] does not exist on this collection instance
I hope it will work.
If table doesn't have 'id' as primary key you should specify what the primary key is inside your model:
protected $primaryKey = 'your_primary_key';
Relation looks good, after that you must make sure $user is a defined instance of Employee, because your error probably means that your instance wasn't even defined, so for example if you are using list.blade.php, you need to change the return of your controller and indicate that you want to pass data to your view, for example you could do it like this:
return view('users.list', compact('user'));
Where user is an instance of Employee saved on '$user'
Update
First you should check your user is retrieved properly, you can check it by placing a dd($user)
And when you return a view you can pass information to it, a cleaner way of doing what you are trying to do is what I wrote earlier so you would end up having something like this:
public function index()
{
$users = DB::table('nmtrabajador')
->where('CONDICION', '=', 'A')
->get();
// dd($user) for debugging you are retrieving the user properly
return view('users.list', compact($users));
}
When creating an entry using create() - Why does it return a relationship of pilot_id table instead of just showing the value of pilot_id?
For example, in the repository class:
public function createFlight()
$flight = App\Flight::create([
'name' => 'Flight 10'
'pilot_id' => 4
]);
return $flight;
}
In the controller:
public function show()
{
$data = $this->flight->createFlight();
return $data
}
It would return json on the screen but it is not showing the relationship table (pilot) of pilot_id.
Try adding the following to your Flight model, like so. By default you need to tell Laravel to include any relationships.
protected $with = ['pilot'];
That will make it so everytime it includes the relationship. If this is not desirable, then you will want to load the relationships when you return the flight, like so.
return $flight->load(['pilot']);
It shows pilot_id is 4 because that's what its value is. Did you create a relationship on the Flight so that Laravel knows how to retrieve the model for Pilot? It should look something like this:
public function pilot()
{
return $this->hasOne('App\Pilot');
}
When you return a model directly from the controller, it invokes the toJson() method to convert the object to a string. If you want to append the contents of a related model you can do so by adding the relationship to the $with variable on the Flight model.
protected $with = ['pilot']
I have a table called payments which contains a field called Vendor ZIP.
I have a table called 201502_postcodes and my "join" in this case is the postcode field in this table.
How do I return field values in this 201502_postcodes table using Eloquent?
My Models are;
<?php namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class Payment extends Model {
public function postcodeExtract()
{
return $this->belongsTo('App\Models\PostcodeExtract', 'postcode', 'Vendor ZIP');
}
_
<?php namespace App\Models;
use Illuminate\Database\Eloquent\Model;
class PostcodeExtract extends Model {
protected $connection = 'postcodes';
public function scopeFromTable($query, $tableName)
{
return $query->from($tableName);
}
public function payment()
{
return $this->hasMany('App\Models\Payment', 'Vendor ZIP', 'postcode');
}
So, I have a scope on this model because the 201502 part of my table name is a variable (in that, a new one comes in every quarter).
In my controller... I have no idea what to put. I don't know how to get both scope and relationship to work. How can I write a query that will take a postcode/zip and output one of the fields from the (do I refer to them as "methods"?) postcode extract table?
It is not a duplicate of this question Laravel 4: Dynamic table names using setTable() because relationships are not involved or discussed on that question.
--- UPDATE ---
If I am to use getTable - would it go something like this...
class PostcodeExtract {
public function setTableByDate($selected_tablename)
{
$this->table = $selected_tablename;
// Return $this for method chaining
return $this;
}
public function getTable()
{
if (isset($this->table))
$this->setTableByDate($this->table);
return $this->table;
}
}
And then I would use it in my controller like;
$selected_tablename = 201502_postcode //created by some other controller
$postcode_extract = new PostcodeExtract;
$data = $postcode_extract->setTableByDate($selected_tablename)->get()->toArray();
The Carbon stuff isn't really relevant. I have a lookup to get those tablenames the fact the prefix with a date like value shouldn't mean it's treated like a date.
There are a couple of things going on here.
scopeFromTable() is redundant
Laravel employs magic methods to handle calls to undefined methods. Calling from() on the model will actually call from() on the models internal Query object (assuming you didn't define a method called 'from' on the model itself). It's worth reading the __call and __callStatic methods on the Model class.
relationships use getTable()
Another aspect of the Laravel is the concept of convention over configuration. This basically means that the framework assumes some things so that you don't have to define every detail. In regards to table naming convention, it will naturally use a table name derived from the class name.
// Uses table 'foos'
class Foo {}
There are a few ways to change this behavior. First, you can define a 'table' data member like this.
class Foo {
protected $table = 'bars';
}
If you need a more dynamic behavior, then you can redefine the getTable method.
class Foo {
public function getTable()
{
// return your special table name based on today's date
}
}
Ultimately the models and their relationships refer to getTable to figure out what the table names should be.
your use cases
If you only ever need to query the current table, then I would suggest redefining getTable.
If you need to query both current and past tables, then I suggest pairing a new method along side redefining getTable
class Foo {
public function setTableByDate(\DateTime $date)
{
$this->table = // generate table name from $date
// Return $this for method chaining
return $this;
}
public function getTable()
{
if (isset($this->table))
$this->setTableByDate(\Carbon\Carbon::now());
return $this->table;
}
}
With this in place, you don't have to worry about the table name in your controller or anywhere else unless you need to query past records.
setting the table by date per user
$foos = Foo::setTableByDate($user->some_date)->where(...)->get();
I have a problem with displaying data from the form. He wants to load the data from two tables joined the foreign key.
I do not know what I'm doing wrong because I Chaly time returns the message:
Undefined property: Illuminate\Database\Eloquent\Relations\HasMany::$file
offers tabel:
id
user_id
title
...
photosofoffers tabel:
id
offer_id <- primary key offers.id
file (url photos)
...
my view:
#foreach($offers as $offer)
{{ HTML::image($offer->photosofoffers()->file, $offer->title, array('width'=>'50')) }}
my model Offer:
protected $fillable = array('id_category','user_id', 'title', 'description', 'price', 'availability');
public static $rules = array(
'id_category'=>'required|integer',
'title'=>'required|min:2',
'description'=>'required|min:2',
'price'=>'required|numeric',
'availability'=>'integer'
);
public function photosofoffers(){
return $this->hasMany('Photosofoffer');
}
public function category() {
return $this->belongsTo('Category');
}
}
my model Photosofoffer
<?php
class Photosofoffer extends Eloquent {
public function offer(){
return $this->belongsTo('Offer');
}
public function offers() {
return $this->hasMany('Offer');
}
}
How to display ads to load any pictures from another table?
hasMany means there are many photos of one offer. Therefore is it wise to call $something->photosofoffer()->photo ? If the return is an object, you'll definitely get an error.
First do dd($offer->photosofoffers()) or dd($offer->photosofoffers) to see what's happening. Then, if the object is properly being derived, You need to check loop through it. like #foreach($offer->photosofoffers as $photo) your loop of diplaying image #endforeach.
If there is nothing being derived, change the Controller function where you collect the actual $offer and make it Model::with('photoofoffers')->get() or first()
That should clear this up.
Hope this helps.
YK.