Fix event listener tests, improve domain logic

src/Database/Models/Concerns/HasADataColumn.php

@@ -1,7 +1,9 @@
 <?php
 
+// todo move namespace one dir above
 namespace Stancl\Tenancy\Database\Models\Concerns;
 
+// todo rename
 trait HasADataColumn
 {
     public static function bootHasADataColumn()

src/Database/Models/Concerns/HasDomains.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Stancl\Tenancy\Database\Models\Concerns;
+
+trait HasDomains
+{
+    public function domains()
+    {
+        return $this->hasMany(config('tenancy.domain_model'));
+    }
+}

src/Database/Models/Concerns/PrimaryDomain.php

@@ -0,0 +1,17 @@
+<?php
+
+namespace Stancl\Tenancy\Database\Models\Concerns;
+
+/**
+ * @property-read string $primary_domain_hostname
+ */
+trait PrimaryDomain
+{
+    // This string should usually come from a relationship implemented by you.
+    abstract public function getPrimaryDomainHostnameAttribute(): string;
+
+    public function route($route, $parameters = [], $absolute = true)
+    {
+        return tenant_route($this->primary_domain_hostname, $route, $parameters, $absolute);
+    }
+}

src/Database/Models/Concerns/TenantConnection.php

@@ -0,0 +1,11 @@
+<?php
+
+namespace Stancl\Tenancy\Database\Models\Concerns;
+
+trait TenantConnection
+{
+    public function getConnectionName()
+    {
+        return 'tenant';
+    }
+}

src/Database/Models/Domain.php

@@ -19,6 +19,9 @@ use Stancl\Tenancy\Exceptions\DomainsOccupiedByOtherTenantException;
 class Domain extends Model
 {
     public $guarded = [];
+    public $casts = [
+        'is_primary' => 'bool',
+    ];
 
     public static function booted()
     {