Bug 782 - ->whereIn() returns all records instead of no records when passed an empty array

src/Query/Builder.php

@@ -1063,6 +1063,15 @@ public function whereNotContains(string $field, string $value): static
      */
     public function whereIn(string $field, array $values): static
     {
+        if (empty($values)) {
+            // If the array of values is empty, we will
+            // add an empty OR filter to the query to
+            // ensure that no results are returned.
+            $this->rawFilter('(|)');
+
+            return $this;
+        }
+
         return $this->orFilter(function (Builder $query) use ($field, $values) {
             foreach ($values as $value) {
                 $query->whereEquals($field, $value);

tests/Integration/QueryTest.php

@@ -64,4 +64,15 @@ public function test_it_cannot_override_limit_when_chunking()
 
         $this->assertEquals(2, $pages);
     }
+
+    public function test_it_returns_no_results_with_empty_where_in_array()
+    {
+        $user = $this->makeUser($this->ou);
+
+        $user->save();
+
+        $this->assertCount(1, User::get());
+        $this->assertCount(1, User::whereIn('cn', [$user->getFirstAttribute('cn')])->get());
+        $this->assertEmpty(User::whereIn('cn', [])->get());
+    }
 }

tests/Unit/Query/BuilderTest.php

@@ -625,6 +625,15 @@ public function test_built_where_in()
         $this->assertEquals('(|(name=john)(name=mary)(name=sue))', $b->getUnescapedQuery());
     }
 
+    public function test_built_where_in_with_empty_array()
+    {
+        $b = $this->newBuilder();
+
+        $b->whereIn('name', []);
+
+        $this->assertEquals('(|)', $b->getUnescapedQuery());
+    }
+
     public function test_built_where_approximately_equals()
     {
         $b = $this->newBuilder();