Add support for float fields

src/Field/FloatField.php

@@ -0,0 +1,28 @@
+<?php declare(strict_types=1);
+
+namespace Dynamap\Field;
+
+class FloatField extends Field
+{
+    public function dynamoDbType(): string
+    {
+        return 'N';
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function castValueForDynamoDbFormat($value): string
+    {
+        // Numbers should be sent as strings to DynamoDB
+        return (string) $value;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function castValueFromDynamoDbFormat($value): float
+    {
+        return (float) $value;
+    }
+}

src/TableMapping.php

@@ -5,6 +5,7 @@
 use Dynamap\Field\BooleanField;
 use Dynamap\Field\DateTimeField;
 use Dynamap\Field\Field;
+use Dynamap\Field\FloatField;
 use Dynamap\Field\IntegerField;
 use Dynamap\Field\StringField;
 use Symfony\Component\PropertyInfo\PropertyInfoExtractorInterface;
@@ -98,6 +99,9 @@ private function readProperties(string $className, array $keys): void
                 case 'int':
                     $fieldMapping = new IntegerField($property);
                     break;
+                case 'float':
+                    $fieldMapping = new FloatField($property);
+                    break;
                 case 'bool':
                     $fieldMapping = new BooleanField($property);
                     break;

tests/DynamapTest.php

@@ -101,6 +101,16 @@ public function test string attribute(): void
         $this->assertEquals('Hello world!', $article->getName());
     }
 
+    public function test float attribute(): void
+    {
+        $this->dynamap->save(new Article(123));
+
+        /** @var Article $article */
+        $article = $this->dynamap->get('articles', 123);
+
+        $this->assertEquals(5., $article->getRating());
+    }
+
     public function test update existing object(): void
     {
         $article = new Article(123);

tests/Fixture/Article.php

@@ -10,6 +10,9 @@ class Article
     /** @var string|null */
     private $name;
 
+    /** @var float */
+    private $rating = 5.;
+
     /** @var bool */
     private $published = false;
 
@@ -40,6 +43,11 @@ public function getName(): ?string
         return $this->name;
     }
 
+    public function getRating(): float
+    {
+        return $this->rating;
+    }
+
     public function publish(): void
     {
         $this->published = true;