问遇到错误但无法解决: count()：参数#1 ($value)必须是可数型的\\数组，字符串给定

EN

TypeError
count(): Argument #1 ($value) must be of type Countable|array, string given

vendor/laravel/framework/src/Illuminate/Database/Eloquent/Concerns/GuardsAttributes.php:235

<?php

namespace Illuminate\Database\Eloquent\Concerns;

use Illuminate\Support\Str;

trait GuardsAttributes
{
    /**
     * The attributes that are mass assignable.
     *
     * @var string[]
     */
    protected $fillable = [];

    /**
     * The attributes that aren't mass assignable.
     *
     * @var string[]|bool
     */
    protected $guarded = ['*'];

    /**
     * Indicates if all mass assignment is enabled.
     *
     * @var bool
     */
    protected static $unguarded = false;

    /**
     * The actual columns that exist on the database and can be guarded.
     *
     * @var array
     */
    protected static $guardableColumns = [];

    /**
     * Get the fillable attributes for the model.
     *
     * @return array
     */
    public function getFillable()
    {
        return $this->fillable;
    }

    /**
     * Set the fillable attributes for the model.
     *
     * @param  array  $fillable
     * @return $this
     */
    public function fillable(array $fillable)
    {
        $this->fillable = $fillable;

        return $this;
    }

    /**
     * Merge new fillable attributes with existing fillable attributes on the model.
     *
     * @param  array  $fillable
     * @return $this
     */
    public function mergeFillable(array $fillable)
    {
        $this->fillable = array_merge($this->fillable, $fillable);

        return $this;
    }

    /**
     * Get the guarded attributes for the model.
     *
     * @return array
     */
    public function getGuarded()
    {
        return $this->guarded === false
                    ? []
                    : $this->guarded;
    }

    /**
     * Set the guarded attributes for the model.
     *
     * @param  array  $guarded
     * @return $this
     */
    public function guard(array $guarded)
    {
        $this->guarded = $guarded;

        return $this;
    }

    /**
     * Merge new guarded attributes with existing guarded attributes on the model.
     *
     * @param  array  $guarded
     * @return $this
     */
    public function mergeGuarded(array $guarded)
    {
        $this->guarded = array_merge($this->guarded, $guarded);

        return $this;
    }

    /**
     * Disable all mass assignable restrictions.
     *
     * @param  bool  $state
     * @return void
     */
    public static function unguard($state = true)
    {
        static::$unguarded = $state;
    }

    /**
     * Enable the mass assignment restrictions.
     *
     * @return void
     */
    public static function reguard()
    {
        static::$unguarded = false;
    }

    /**
     * Determine if the current state is "unguarded".
     *
     * @return bool
     */
    public static function isUnguarded()
    {
        return static::$unguarded;
    }

    /**
     * Run the given callable while being unguarded.
     *
     * @param  callable  $callback
     * @return mixed
     */
    public static function unguarded(callable $callback)
    {
        if (static::$unguarded) {
            return $callback();
        }

        static::unguard();

        try {
            return $callback();
        } finally {
            static::reguard();
        }
    }

    /**
     * Determine if the given attribute may be mass assigned.
     *
     * @param  string  $key
     * @return bool
     */
    public function isFillable($key)
    {
        if (static::$unguarded) {
            return true;
        }

        // If the key is in the "fillable" array, we can of course assume that it's
        // a fillable attribute. Otherwise, we will check the guarded array when
        // we need to determine if the attribute is black-listed on the model.
        if (in_array($key, $this->getFillable())) {
            return true;
        }

        // If the attribute is explicitly listed in the "guarded" array then we can
        // return false immediately. This means this attribute is definitely not
        // fillable and there is no point in going any further in this method.
        if ($this->isGuarded($key)) {
            return false;
        }

        return empty($this->getFillable()) &&
            strpos($key, '.') === false &&
            ! Str::startsWith($key, '_');
    }

    /**
     * Determine if the given key is guarded.
     *
     * @param  string  $key
     * @return bool
     */
    public function isGuarded($key)
    {
        if (empty($this->getGuarded())) {
            return false;
        }

        return $this->getGuarded() == ['*'] ||
               ! empty(preg_grep('/^'.preg_quote($key).'$/i', $this->getGuarded())) ||
               ! $this->isGuardableColumn($key);
    }

    /**
     * Determine if the given column is a valid, guardable column.
     *
     * @param  string  $key
     * @return bool
     */
    protected function isGuardableColumn($key)
    {
        if (! isset(static::$guardableColumns[get_class($this)])) {
            static::$guardableColumns[get_class($this)] = $this->getConnection()
                        ->getSchemaBuilder()
                        ->getColumnListing($this->getTable());
        }

        return in_array($key, static::$guardableColumns[get_class($this)]);
    }

    /**
     * Determine if the model is totally guarded.
     *
     * @return bool
     */
    public function totallyGuarded()
    {
        return count($this->getFillable()) === 0 && $this->getGuarded() == ['*'];
    }

    /**
     * Get the fillable attributes of a given array.
     *
     * @param  array  $attributes
     * @return array
     */
    protected function fillableFromArray(array $attributes)
    {
        if (count($this->getFillable()) > 0 && ! static::$unguarded) {
            return array_intersect_key($attributes, array_flip($this->getFillable()));
        }

        return $attributes;
    }
}

    public function fill(array $attributes)
    {
        $totallyGuarded = $this->totallyGuarded();

        foreach ($this->fillableFromArray($attributes) as $key => $value) {
            // The developers may choose to place some attributes in the "fillable" array
            // which means only those attributes may be set through mass assignment to
            // the model, and all others will just get ignored for security reasons.
            if ($this->isFillable($key)) {
                $this->setAttribute($key, $value);
            } elseif ($totallyGuarded) {
                throw new MassAssignmentException(sprintf(
                    'Add [%s] to fillable property to allow mass assignment on [%s].',
                    $key, get_class($this)
                ));
            }
        }

        return $this;
    }

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class user extends Model
{
    use HasFactory;
    protected $fillable = 'name';
}