support ignoring fields at the model level (#7)

* support ignoring fields at the model level

* add example for more custom exclude logic

README.md

@@ -42,6 +42,27 @@ php artisan make:model-auditlog "\App\User"
 
 Replace `\App\User` with your own model name. Model / table options can be tweaked in the config file.
 
+If you need to ignore specific fields on your model, extend the `getAuditLogIgnoredFields()` method and return an array of fields.
+
+```php
+public function getAuditLogIgnoredFields() : array
+{
+    return ['posted_at'];
+}
+```
+
+Using that functionality, you can add more custom logic around what should be logged. An example might be to not log the title changes of a post if the post has not been published yet.
+```php
+public function getAuditLogIgnoredFields() : array
+{
+    if ($this->postHasBeenPublished()) {
+        return ['title'];
+    }
+
+    return [];
+}
+```
+
 ### Testing
 
 ``` bash

src/Models/BaseModel.php

@@ -38,6 +38,7 @@ public static function recordChanges(int $event_type, $model) : void
 
         collect($changes)
             ->except(config('model-auditlog.global_ignored_fields'))
+            ->except($model->getAuditLogIgnoredFields())
             ->except([
                 $model->getKeyName(), // Ignore the current model's primary key
                 'created_at',

src/Traits/AuditLoggable.php

@@ -43,6 +43,16 @@ public function getAuditLogTableName() : string
         return $this->getTable() . config('model-auditlog.table_suffix');
     }
 
+    /**
+     * Get fields that should be ignored from the auditlog for this model.
+     *
+     * @return array
+     */
+    public function getAuditLogIgnoredFields() : array
+    {
+        return [];
+    }
+
     /**
      * Get the audit logs for this model.
      *

tests/Fakes/Models/IgnoredFieldsPost.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace OrisIntel\AuditLog\Tests\Fakes\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use OrisIntel\AuditLog\Traits\AuditLoggable;
+
+class IgnoredFieldsPost extends Model
+{
+    use AuditLoggable;
+
+    protected $guarded = [];
+
+    protected $table = 'posts';
+
+    public function getAuditLogIgnoredFields() : array
+    {
+        return ['posted_at'];
+    }
+}

tests/Fakes/Models/IgnoredFieldsPostAuditLog.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace OrisIntel\AuditLog\Tests\Fakes\Models;
+
+use OrisIntel\AuditLog\Models\BaseModel;
+
+class IgnoredFieldsPostAuditLog extends BaseModel
+{
+    public $timestamps = false;
+
+    public $table = 'posts_auditlog';
+}

tests/PostModelTest.php

@@ -5,6 +5,7 @@
 use Illuminate\Foundation\Testing\DatabaseTransactions;
 use Illuminate\Support\Collection;
 use OrisIntel\AuditLog\EventType;
+use OrisIntel\AuditLog\Tests\Fakes\Models\IgnoredFieldsPost;
 use OrisIntel\AuditLog\Tests\Fakes\Models\NonSoftDeletePost;
 use OrisIntel\AuditLog\Tests\Fakes\Models\Post;
 use OrisIntel\AuditLog\Tests\Fakes\Models\PostAuditLog;
@@ -148,4 +149,20 @@ public function restoring_a_post_triggers_a_revision()
         $this->assertEquals('deleted_at', $last->field_name);
         $this->assertNull($last->field_value_new);
     }
+
+    /** @test */
+    public function fields_can_be_ignored()
+    {
+        /** @var Post $post */
+        $post = IgnoredFieldsPost::create([
+            'title'     => 'Test',
+            'posted_at' => '2019-04-05 12:00:00',
+        ]);
+
+        $this->assertEquals(1, $post->auditLogs()->count());
+
+        $post->update(['posted_at' => now()]);
+
+        $this->assertEquals(1, $post->auditLogs()->count());
+    }
 }