vague first draft of v3. TenantModelTest is passing

src/Database/Models/Concerns/CentralConnection.php

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+<?php
+
+namespace Stancl\Tenancy\Database\Models\Concerns;
+
+trait CentralConnection
+{
+    public function getConnectionName()
+    {
+        return config('tenancy.central_connection');
+    }
+}

src/Database/Models/Concerns/GeneratesIds.php

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+<?php
+
+namespace Stancl\Tenancy\Database\Models\Concerns;
+
+trait GeneratesIds
+{
+    public static function bootGeneratesIds()
+    {
+        static::creating(function (self $model) {
+            if (! $model->id && config('tenancy.id_generator')) {
+                $model->id = app(config('tenancy.id_generator'))->generate($model);
+            }
+        });
+    }
+}

src/Database/Models/Concerns/HasADataColumn.php

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+<?php
+
+namespace Stancl\Tenancy\Database\Models\Concerns;
+
+trait HasADataColumn
+{
+    public static function bootHasADataColumn()
+    {
+        $encode = function (self $model) {
+            foreach ($model->getAttributes() as $key => $value) {
+                if (! in_array($key, static::getCustomColums())) {
+                    $current = $model->getAttribute(static::getDataColumn()) ?? [];
+
+                    $model->setAttribute(static::getDataColumn(), array_merge($current, [
+                        $key => $value,
+                    ]));
+
+                    unset($model->attributes[$key]);
+                }
+            }
+        };
+
+        $decode = function (self $model) {
+            foreach ($model->getAttribute(static::getDataColumn()) ?? [] as $key => $value) {
+                $model->setAttribute($key, $value);
+            }
+
+            $model->setAttribute(static::getDataColumn(), null);
+        };
+
+        static::saving($encode);
+        static::saved($decode);
+        static::retrieved($decode);
+    }
+
+    public function getCasts()
+    {
+        return array_merge(parent::getCasts(), [
+            static::getDataColumn() => 'array',
+        ]);
+    }
+
+    /**
+     * Get the name of the column that stores additional data.
+     */
+    public static function getDataColumn(): string
+    {
+        return 'data';
+    }
+
+    public static function getCustomColums(): array
+    {
+        return array_merge(['id'], config('tenancy.custom_columns'));
+    }
+}

src/Database/Models/Domain.php

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+<?php
+
+namespace Stancl\Tenancy\Database\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Stancl\Tenancy\Events\DomainCreated;
+use Stancl\Tenancy\Events\DomainDeleted;
+use Stancl\Tenancy\Events\DomainSaved;
+use Stancl\Tenancy\Events\DomainUpdated;
+
+class Domain extends Model
+{
+    public function tenant()
+    {
+        return $this->belongsTo(Tenant::class);
+    }
+
+    protected $dispatchEvents = [
+        'saved' => DomainSaved::class,
+        'created' => DomainCreated::class,
+        'updated' => DomainUpdated::class,
+        'deleted' => DomainDeleted::class,
+    ];
+}

src/Database/Models/Tenant.php

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+<?php
+
+namespace Stancl\Tenancy\Database\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Stancl\Tenancy\DatabaseConfig;
+use Stancl\Tenancy\Events;
+
+// todo use a contract
+class Tenant extends Model
+{
+    use Concerns\CentralConnection, Concerns\HasADataColumn, Concerns\GeneratesIds, Concerns\HasADataColumn {
+        Concerns\HasADataColumn::getCasts as dataColumnCasts;
+    }
+
+    public $primaryKey = 'id';
+
+    public function getCasts()
+    {
+        return array_merge($this->dataColumnCasts(), [
+            'id' => $this->getIncrementing() ? 'integer' : 'string',
+        ]);
+    }
+
+    public function getIncrementing()
+    {
+        return config('tenancy.id_generator') === null;
+    }
+
+    public $guarded = [];
+
+    public function domains() // todo not required
+    {
+        return $this->hasMany(Domain::class);
+    }
+
+    public static function internalPrefix(): string
+    {
+        return config('tenancy.database_prefix');
+    }
+
+    /**
+     * Get an internal key.
+     *
+     * @param string $key
+     * @return mixed
+     */
+    public function getInternal(string $key)
+    {
+        return $this->getAttribute(static::internalPrefix() . $key);
+    }
+
+    /**
+     * Set internal key.
+     *
+     * @param string $key
+     * @param mixed $value
+     * @return $this
+     */
+    public function setInternal(string $key, $value)
+    {
+        $this->setAttribute($key, $value);
+
+        return $this;
+    }
+
+    public function database(): DatabaseConfig
+    {
+        return new DatabaseConfig($this);
+    }
+
+    public function run(callable $callback)
+    {
+        $originalTenant = $this->manager->getTenant();
+
+        $this->manager->initializeTenancy($this);
+        $result = $callback($this);
+        $this->manager->endTenancy($this);
+
+        if ($originalTenant) {
+            $this->manager->initializeTenancy($originalTenant);
+        }
+
+        return $result;
+    }
+
+    protected $dispatchesEvents = [
+        'saved' => Events\TenantSaved::class,
+        'created' => Events\TenantCreated::class,
+        'updated' => Events\TenantUpdated::class,
+        'deleted' => Events\TenantDeleted::class,
+    ];
+}