diff --git a/src/Database/Resource.php b/src/Database/Resource.php
index bbdd9db..da73a2a 100644
--- a/src/Database/Resource.php
+++ b/src/Database/Resource.php
@@ -6,6 +6,7 @@
 
 namespace Minz\Database;
 
+use Minz\Errors;
 use Minz\Request;
 
 /**
@@ -53,7 +54,23 @@ trait Resource
      */
     public static function loadFromRequest(Request $request, string $parameter = 'id'): ?self
     {
-        $pk_value = $request->parameters->getString($parameter, '');
+        $pk_column = self::primaryKeyColumn();
+        $column_declarations = self::databaseColumns();
+        $pk_column_declaration = $column_declarations[$pk_column];
+        $pk_type = $pk_column_declaration['type'];
+
+        if ($pk_type === 'int') {
+            $pk_value = $request->parameters->getInteger($parameter);
+        } elseif ($pk_type === 'string') {
+            $pk_value = $request->parameters->getString($parameter);
+        } else {
+            $pk_value = null;
+        }
+
+        if ($pk_value === null) {
+            return null;
+        }
+
         return self::find($pk_value);
     }
 
@@ -61,12 +78,18 @@ public static function loadFromRequest(Request $request, string $parameter = 'id
      * Return a Recordable model by using a request parameter as primary key
      * value, or fail if none is found.
      *
-     * @throws \Minz\Errors\MissingRecordError
+     * @throws Errors\MissingRecordError
      *     If the model doesn't exist.
      */
     public static function requireFromRequest(Request $request, string $parameter = 'id'): self
     {
-        $pk_value = $request->parameters->getString($parameter, '');
-        return self::require($pk_value);
+        $model = self::loadFromRequest($request, $parameter);
+
+        if ($model === null) {
+            $class = self::class;
+            throw new Errors\MissingRecordError("No {$class} model matching '{$parameter}' request parameter.");
+        }
+
+        return $model;
     }
 }
diff --git a/tests/Database/ResourceTest.php b/tests/Database/ResourceTest.php
index a217587..ae1ee23 100644
--- a/tests/Database/ResourceTest.php
+++ b/tests/Database/ResourceTest.php
@@ -63,6 +63,21 @@ public function testLoadFromRequestWithWrongId(): void
         $this->assertNull($friend);
     }
 
+    public function testLoadFromRequestWithInvalidParameterType(): void
+    {
+        /** @var int $id */
+        $id = models\Friend::create([
+            'name' => 'Alix',
+        ]);
+        $request = new Request('GET', '/', parameters: [
+            'id' => 'foo',
+        ]);
+
+        $friend = models\Friend::loadFromRequest($request);
+
+        $this->assertNull($friend);
+    }
+
     public function testRequireFromRequest(): void
     {
         /** @var int $id */
@@ -81,7 +96,7 @@ public function testRequireFromRequest(): void
     public function testRequireFromRequestWithUnknownId(): void
     {
         $this->expectException(Errors\MissingRecordError::class);
-        $this->expectExceptionMessage("AppTest\\models\\Friend model #42 does not exist");
+        $this->expectExceptionMessage("No AppTest\\models\\Friend model matching 'id' request parameter");
 
         /** @var int $id */
         $id = models\Friend::create([
@@ -93,4 +108,20 @@ public function testRequireFromRequestWithUnknownId(): void
 
         models\Friend::requireFromRequest($request);
     }
+
+    public function testRequireFromRequestWithInvalidParameterType(): void
+    {
+        $this->expectException(Errors\MissingRecordError::class);
+        $this->expectExceptionMessage("No AppTest\\models\\Friend model matching 'id' request parameter");
+
+        /** @var int $id */
+        $id = models\Friend::create([
+            'name' => 'Alix',
+        ]);
+        $request = new Request('GET', '/', parameters: [
+            'id' => 'foo',
+        ]);
+
+        models\Friend::requireFromRequest($request);
+    }
 }