[5.x] Add validation replacements to replicator and grid field types

src/Fieldtypes/AddsEntryValidationReplacements.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Statamic\Fieldtypes;
+
+use Statamic\Entries\Entry;
+use Statamic\Fields\Field;
+use Statamic\Fields\Validator;
+
+/**
+ * TODO
+ * This allows Grid/Replicator/Bard fields to add validation replacements.
+ * It adds the same replacements that get added in EntriesController@update.
+ * Ideally those would get passed down into the field automatically somehow,
+ * so this can be considered a workaround until that happens.
+ */
+trait AddsEntryValidationReplacements
+{
+    protected function addEntryValidationReplacements(Field $field, Validator $rules): Validator
+    {
+        $fieldParent = $field->parent();
+
+        if (! $fieldParent instanceof Entry) {
+            return $rules;
+        }
+
+        return $rules->withReplacements([
+            'id' => $fieldParent->id(),
+            'collection' => $fieldParent->collection()->handle(),
+            'site' => $fieldParent->locale(),
+        ]);
+    }
+}

src/Fieldtypes/Grid.php

@@ -14,6 +14,8 @@
 
 class Grid extends Fieldtype
 {
+    use AddsEntryValidationReplacements;
+
     protected $categories = ['structured'];
     protected $defaultable = false;
 
@@ -158,7 +160,10 @@ protected function rowRules($data, $index)
             ->validator()
             ->withContext([
                 'prefix' => $this->field->validationContext('prefix').$this->rowRuleFieldPrefix($index).'.',
-            ])
+            ]);
+
+        $rules = $this
+            ->addEntryValidationReplacements($this->field, $rules)
             ->rules();
 
         return collect($rules)->mapWithKeys(function ($rules, $handle) use ($index) {

src/Fieldtypes/Replicator.php

@@ -16,6 +16,8 @@
 
 class Replicator extends Fieldtype
 {
+    use AddsEntryValidationReplacements;
+
     protected $categories = ['structured'];
     protected $keywords = ['builder', 'page builder', 'content'];
     protected $rules = ['array'];
@@ -150,7 +152,10 @@ protected function setRules($handle, $data, $index)
             ->validator()
             ->withContext([
                 'prefix' => $this->field->validationContext('prefix').$this->setRuleFieldPrefix($index).'.',
-            ])
+            ]);
+
+        $rules = $this
+            ->addEntryValidationReplacements($this->field, $rules)
             ->rules();
 
         return collect($rules)->mapWithKeys(function ($rules, $handle) use ($index) {