[Feature] add replaceTranslations method which allows to replace all …

…the translatios for a single key (#231)

Co-authored-by: Javier Ledezma <jledezma@medtrainer.com>

README.md

@@ -176,6 +176,28 @@ $translations = [
 $newsItem->setTranslations('name', $translations);
 ```
 
+#### Replace translations in one go
+
+You can replace all the translations for a single key using this method:
+
+```php
+public function replaceTranslations(string $key, array $translations)
+```
+
+Here's an example:
+
+```php
+$translations = ['en' => 'hello', 'es' => 'hola'];
+
+$newsItem->setTranslations('hello', $translations);
+$newsItem->getTranslations(); // ['en' => 'hello', 'es' => 'hola']
+
+$newTranslations = ['en' => 'hello'];
+
+$newsItem->replaceTranslations('hello', $newTranslations);
+$newsItem->getTranslations(); // ['en' => 'hello']
+```
+
 #### Setting the model locale
 The default locale used to translate models is the application locale,
 however it can sometimes be handy to use a custom locale.  

src/HasTranslations.php

@@ -164,6 +164,17 @@ public function hasTranslation(string $key, string $locale = null): bool
         return isset($this->getTranslations($key)[$locale]);
     }
 
+    public function replaceTranslations(string $key, array $translations): self
+    {
+        foreach ($this->getTranslatedLocales($key) as $locale) {
+            $this->forgetTranslation($key, $locale);
+        }
+
+        $this->setTranslations($key, $translations);
+
+        return $this;
+    }
+
     protected function guardAgainstNonTranslatableAttribute(string $key)
     {
         if (! $this->isTranslatableAttribute($key)) {

tests/TranslatableTest.php

@@ -562,4 +562,18 @@ public function it_can_set_and_fetch_attributes_based_on_set_locale()
         $this->testModel->setLocale('fr');
         $this->assertSame($fr, $this->testModel->name);
     }
+
+    /** @test */
+    public function it_can_replace_translations()
+    {
+        $translations = ['nl' => 'hallo', 'en' => 'hello', 'kh' => 'សួរស្តី'];
+
+        $this->testModel->setTranslations('name', $translations);
+        $this->testModel->save();
+
+        $newTranslations = ['es' => 'hola'];
+        $this->testModel->replaceTranslations('name', $newTranslations);
+
+        $this->assertEquals($newTranslations, $this->testModel->getTranslations('name'));
+    }
 }