You may use any of these methods in your Eloquent queries. To permanently remove a soft deleted model from the database, use the forceDelete method: You may create an unsaved copy of a model instance using the replicate method.
The updating / updated events will fire when an existing model is modified and the save method is called. Define a class that implements the Illuminate\Database\Eloquent\Scope interface. Realizzare applicazioni per il Web utilizzando i framework PHP. These methods return the appropriate scalar value instead of a full model instance: To create a new record in the database, create a new model instance, set attributes on the model, then call the save method: In this example, we assign the name parameter from the incoming HTTP request to the name attribute of the App\Models\Flight model instance. La tua iscrizione è andata a buon fine.
Scope parameters should be defined after the $query parameter: Now, you may pass the parameters when calling the scope: Sometimes you may need to determine if two models are the "same". Questo framework mette a disposizione una miriade di strumenti che aiutano il programmatore a sviluppare un’app abbastanza velocemente. Nel caso non si disponga dell’entità è possibile eliminare il record a partire dall’id o da una query: Laravel supporta out-of-the-box l’eliminazione logica dei record. Each event receives the instance of the model through its constructor. Questo avviene tramite la classe Model di Eloquent che mappa la struttura del DB in uso.
You may define a protected $primaryKey property to override this convention: In addition, Eloquent assumes that the primary key is an incrementing integer value, which means that by default the primary key will automatically be cast to an int. This will prevent the unintentional replacement of the query's existing select clause. If you would like to specify a different connection for the model, use the $connection property: If you would like to define the default values for some of your model's attributes, you may define an $attributes property on your model: Once you have created a model and its associated database table, you are ready to start retrieving data from your database.
To be short, with Eloquent you have a PHP model class, for example `Product` or `Category`. Typically, you should register these Closures in the booted method of your model: If needed, you may utilize queueable anonymous event listeners when registering model events. Scopes should always return a query builder instance: Once the scope has been defined, you may call the scope methods when querying the model. When processing large amounts of data, the cursor method may be used to greatly reduce your memory usage: The cursor returns an Illuminate\Support\LazyCollection instance. Con la property $fillable è possibile configurare i nomi dei campi accettati. Eloquent provides the isDirty, isClean, and wasChanged methods to examine the internal state of your model and determine how its attributes have changed from when they were originally loaded. Like mass updates, mass deletes will not fire any model events for the models that are deleted: {note} When executing a mass delete statement via Eloquent, the deleting and deleted model events will not be fired for the deleted models. This is particularly useful when you have model instances that share many of the same attributes: Global scopes allow you to add constraints to all queries for a given model. So, in this case, Eloquent will assume the Flight model stores records in the flights table, while an AirTrafficController model would store records in an air_traffic_controllers table. Models allow you to query for data in your tables, as well as insert new records into the table. The save method may also be used to update models that already exist in the database. Instead of using custom event classes, you may register Closures that execute when various model events are fired. The Collection class provides a variety of helpful methods for working with your Eloquent results: You may also loop over the collection like an array: If you need to process thousands of Eloquent records, use the chunk command.
Tramite il metodo statico all() è possibile recuperare tutte le entità di una particolare classe: Ciascun modello ottenuto tramite Eloquent è un oggetto PHP che presenta una serie di campi in base alle colonne della tabella sul database. Any code executed within this Closure will not fire model events. Grazie a php artisan make:model Model, il motore di generazione del codice creerà un file all’interno della cartella app. The result of the callback will be considered the result of the firstOr method: The firstOr method also accepts an array of columns to retrieve: Sometimes you may wish to throw an exception if a model is not found.
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