validate if entry type is still allowed

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Moved the “Forgot password?” link below the Password input on the control panel login page. ([#14643](https://github.com/craftcms/cms/pull/14643))
 - Selectize inputs no longer automatically select the hovered option on <kbd>Tab</kbd> press. ([selectize/selectize.js#2085](https://github.com/selectize/selectize.js/issues/2085))
+- Entries now validate that their selected type is allowed by the section. ([#14654](https://github.com/craftcms/cms/pull/14654))
 - Fixed a bug where filesystems’ `afterSave()` and `afterDelete()` methods weren’t getting called. ([#14634](https://github.com/craftcms/cms/pull/14634))
 - Fixed an error that could occur on `elements/recent-activity` Ajax requests when editing an element. ([#14635](https://github.com/craftcms/cms/issues/14635))
 - Fixed a bug where asset queries’ `hasAlt` param wasn’t working. ([#14642](https://github.com/craftcms/cms/pull/14642))

src/elements/Entry.php

@@ -848,6 +848,18 @@ protected function defineRules(): array
             'required',
             'when' => fn() => !isset($this->fieldId),
         ];
+        $rules[] = [
+            ['typeId'],
+            function(string $attribute) {
+                if (!$this->isEntryTypeAllowed()) {
+                    $this->addError($attribute, Craft::t('app', '{type} entries are no longer allowed in this section. Please choose a different entry type.', [
+                        'type' => $this->getType()->getUiLabel(),
+                    ]));
+                }
+            },
+            'skipOnEmpty' => false,
+            'when' => fn() => $this->getIsCanonical(),
+        ];
         $rules[] = [['fieldId'], function(string $attribute) {
             if (isset($this->sectionId)) {
                 $this->addError($attribute, Craft::t('app', '`sectionId` and `fieldId` cannot both be set on an entry.'));
@@ -1934,7 +1946,10 @@ public function metaFieldsHtml(bool $static): string
             // Type
             $fields[] = (function() use ($static) {
                 $entryTypes = $this->getAvailableEntryTypes();
-                if (count($entryTypes) <= 1) {
+                if (!ArrayHelper::contains($entryTypes, fn(EntryType $entryType) => $entryType->id === $this->typeId)) {
+                    $entryTypes[] = $this->getType();
+                }
+                if (count($entryTypes) <= 1 && $this->isEntryTypeAllowed($entryTypes)) {
                     return null;
                 }
 
@@ -2570,4 +2585,21 @@ private function _shouldSaveRevision(): bool
             $this->getSection()?->enableVersioning
         );
     }
+
+    /**
+     * Check if current typeId is in the array of passed in entry types.
+     * If no entry types are passed, check get all the available ones.
+     *
+     * @param array|null $entryTypes
+     * @return bool
+     * @throws InvalidConfigException
+     */
+    private function isEntryTypeAllowed(array|null $entryTypes = null): bool
+    {
+        if ($entryTypes === null) {
+            $entryTypes = $this->getAvailableEntryTypes();
+        }
+
+        return in_array($this->typeId, array_map(fn($entryType) => $entryType->id, $entryTypes));
+    }
 }

src/translations/en/app.php

@@ -2116,6 +2116,7 @@
     '{type} deleted for site.' => '{type} deleted for site.',
     '{type} deleted.' => '{type} deleted.',
     '{type} duplicated.' => '{type} duplicated.',
+    '{type} entries are no longer allowed in this section. Please choose a different entry type.' => '{type} entries are no longer allowed in this section. Please choose a different entry type.',
     '{type} not restored.' => '{type} not restored.',
     '{type} restored.' => '{type} restored.',
     '{type} reverted to past revision.' => '{type} reverted to past revision.',