Get Laravel Models with All Attributes

问题

Is there a way to retrieve a model in Laravel with all the attributes, even if they're null? It seems to only return a model with the attributes that aren't null.

The reason for this is that I have a function that will update the model attributes from an array, if the attributes exists in the model. I use the property_exists() function to check the model if it has a particular attribute before setting it. The array key and model attribute are expected to match, so that's how it works.

It works fine if the model already has the attributes set, because the attribute exists and takes the value from the array. But nothing will get updated or set if the attribute was previously null, because it fails the property_exists() check.

What's ultimately happening is that I have a single array of attributes, and then perhaps two models. And I run my setter function, passing in the attributes array, and each of the objects in separate calls. If the model has a matching property, it gets updated.

回答1:

Here are two ways to do this. One method is to define default attribute values in your model.

protected $attributes = ['column1' => null, 'column2' => 2];

Then, you can use the getAttributes() method to get the model's attributes.

If you don't want to set default attributes though, I wrote up a quick method that should work.

public function getAllAttributes()
{
    $columns = $this->getFillable();
    // Another option is to get all columns for the table like so:
    // $columns = \Schema::getColumnListing($this->table);
    // but it's safer to just get the fillable fields

    $attributes = $this->getAttributes();

    foreach ($columns as $column)
    {
        if (!array_key_exists($column, $attributes))
        {
            $attributes[$column] = null;
        }
    }
    return $attributes;
}

Basically, if the attribute has not been set, this will append a null value to that attribute and return it to you as an array.

回答2:

$model->getAttributes();

Above will return an array of raw attributes (as stored in the database table)

$model->toArray() 

Above will return all the model's raw, mutated(if used), and appended attributes

Hope it will helpful!!

回答3:

Update:

If you are trying to do this after instantiating like so:

$model = new Model;

then please differ to Thomas Kim's answer.

Otherwise: You could use the toArray() or getArributes() method on the model instance, that would give back all the attributes including nulls. Then you can use array_key_exists to check.

Like so:

if (array_key_exists('foo', $model->getAttributes())) {
    $model->foo = 'new value';
}

回答4:

What if you were to explicitly declare all the fields you want back.

public function getSomeModelFromArray(Request $request)
{
    // This will only give back the columns/attributes that have data.
    // NULL values will be omitted doing it this way.
    //$model = $request->all();

    // However by declaring all the attributes I want I can get back 
    // columns even if the value is null. Additional filtering can be 
    // added on if you still want/need to massage the data.
    $model = $request->all([
        'id',
        'attr1',
        'attr2',
        'attr3',
        //...
    ]);

    //...

    return $model;
}

Pretty generic example but hopefully someone will find this useful.

来源：https://stackoverflow.com/questions/33512184/get-laravel-models-with-all-attributes