[9.x] Opt-in Model::preventAccessingMissingAttributes() option (#44283)

* preventAccessingMissingAttributes concept

* Reset missing attribute flag

* StyleCI

* Always revert Model::preventAccessingMissingAttributes

* Only throw on retrieved models

* Add model name to missing attribute exception message

* formatting

* fix oversight

* add should be strict method

Co-authored-by: Taylor Otwell <[email protected]>

Author: inxilpro

src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php

@@ -17,6 +17,7 @@
 use Illuminate\Database\Eloquent\Casts\Attribute;
 use Illuminate\Database\Eloquent\InvalidCastException;
 use Illuminate\Database\Eloquent\JsonEncodingException;
+use Illuminate\Database\Eloquent\MissingAttributeException;
 use Illuminate\Database\Eloquent\Relations\Relation;
 use Illuminate\Database\LazyLoadingViolationException;
 use Illuminate\Support\Arr;
@@ -445,10 +446,31 @@ public function getAttribute($key)
         // since we don't want to treat any of those methods as relationships because
         // they are all intended as helper methods and none of these are relations.
         if (method_exists(self::class, $key)) {
-            return;
+            return $this->throwMissingAttributeExceptionIfApplicable($key);
+        }
+
+        return $this->isRelation($key) || $this->relationLoaded($key)
+                    ? $this->getRelationValue($key)
+                    : $this->throwMissingAttributeExceptionIfApplicable($key);
+    }
+
+    /**
+     * Either throw a missing attribute exception or return null depending on Eloquent's configuration.
+     *
+     * @param  string  $key
+     * @return null
+     *
+     * @throws \Illuminate\Database\Eloquent\MissingAttributeException
+     */
+    protected function throwMissingAttributeExceptionIfApplicable($key)
+    {
+        if ($this->exists &&
+            ! $this->wasRecentlyCreated &&
+            static::preventsAccessingMissingAttributes()) {
+            throw new MissingAttributeException($this, $key);
         }
 
-        return $this->getRelationValue($key);
+        return null;
     }
 
     /**

src/Illuminate/Database/Eloquent/MissingAttributeException.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace Illuminate\Database\Eloquent;
+
+use OutOfBoundsException;
+
+class MissingAttributeException extends OutOfBoundsException
+{
+    /**
+     * Create a new missing attribute exception instance.
+     *
+     * @param  \Illuminate\Database\Eloquent\Model  $model
+     * @param  string  $key
+     * @return void
+     */
+    public function __construct($model, $key)
+    {
+        parent::__construct(sprintf(
+            'The attribute [%s] either does not exist or was not retrieved for model [%s].',
+            $key, get_class($model)
+        ));
+    }
+}

src/Illuminate/Database/Eloquent/Model.php

@@ -181,6 +181,13 @@ abstract class Model implements Arrayable, ArrayAccess, CanBeEscapedWhenCastToSt
      */
     protected static $modelsShouldPreventSilentlyDiscardingAttributes = false;
 
+    /**
+     * Indicates if an exception should be thrown when trying to access a missing attribute on a retrieved model.
+     *
+     * @var bool
+     */
+    protected static $modelsShouldPreventAccessingMissingAttributes = false;
+
     /**
      * Indicates if broadcasting is currently enabled.
      *
@@ -377,6 +384,23 @@ public static function isIgnoringTouch($class = null)
         return false;
     }
 
+    /**
+     * Indicate that models should prevent lazy loading, silently discarding attributes, and accessing missing attributes.
+     *
+     * @param  bool  $shouldBeStrict
+     * @return void
+     */
+    public static function shouldBeStrict(bool $shouldBeStrict = true)
+    {
+        if (! $shouldBeStrict) {
+            return;
+        }
+
+        static::preventLazyLoading();
+        static::preventSilentlyDiscardingAttributes();
+        static::preventsAccessingMissingAttributes();
+    }
+
     /**
      * Prevent model relationships from being lazy loaded.
      *
@@ -410,6 +434,17 @@ public static function preventSilentlyDiscardingAttributes($value = true)
         static::$modelsShouldPreventSilentlyDiscardingAttributes = $value;
     }
 
+    /**
+     * Prevent accessing missing attributes on retrieved models.
+     *
+     * @param  bool  $value
+     * @return void
+     */
+    public static function preventAccessingMissingAttributes($value = true)
+    {
+        static::$modelsShouldPreventAccessingMissingAttributes = $value;
+    }
+
     /**
      * Execute a callback without broadcasting any model events for all model types.
      *
@@ -2100,6 +2135,16 @@ public static function preventsSilentlyDiscardingAttributes()
         return static::$modelsShouldPreventSilentlyDiscardingAttributes;
     }
 
+    /**
+     * Determine if accessing missing attributes is disabled.
+     *
+     * @return bool
+     */
+    public static function preventsAccessingMissingAttributes()
+    {
+        return static::$modelsShouldPreventAccessingMissingAttributes;
+    }
+
     /**
      * Get the broadcast channel route definition that is associated with the given entity.
      *

tests/Database/DatabaseEloquentModelTest.php

@@ -23,6 +23,7 @@
 use Illuminate\Database\Eloquent\Collection;
 use Illuminate\Database\Eloquent\JsonEncodingException;
 use Illuminate\Database\Eloquent\MassAssignmentException;
+use Illuminate\Database\Eloquent\MissingAttributeException;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 use Illuminate\Database\Eloquent\Relations\Relation;
@@ -2319,6 +2320,33 @@ public function testWithoutTouchingOnCallback()
         $this->assertTrue($called);
     }
 
+    public function testAccessingMissingAttributes()
+    {
+        try {
+            Model::preventAccessingMissingAttributes(false);
+
+            $model = new EloquentModelStub(['id' => 1]);
+            $model->exists = true;
+
+            // Default behavior
+            $this->assertEquals(1, $model->id);
+            $this->assertNull($model->this_attribute_does_not_exist);
+
+            Model::preventAccessingMissingAttributes(true);
+
+            // "preventAccessingMissingAttributes" behavior
+            $this->expectException(MissingAttributeException::class);
+            $model->this_attribute_does_not_exist;
+
+            // Ensure that unsaved models do not trigger the exception
+            $newModel = new EloquentModelStub(['id' => 2]);
+            $this->assertEquals(2, $newModel->id);
+            $this->assertNull($newModel->this_attribute_does_not_exist);
+        } finally {
+            Model::preventAccessingMissingAttributes(false);
+        }
+    }
+
     protected function addMockConnection($model)
     {
         $model->setConnectionResolver($resolver = m::mock(ConnectionResolverInterface::class));