Prevent error when there's a set without any fields ...

There's no way to send "an empty object" from PHP to JS. An empty array in PHP becomes an empty object in JS. So, setting this stupid underscore key to force it to be an object.

Author: jasonvarga

resources/js/components/fieldtypes/replicator/ManagesPreviewText.js

@@ -3,7 +3,7 @@ export default {
     computed: {
         previewText() {
             const previews = _(this.previews).filter((value, handle) => {
-                const config = _.findWhere(this.config.fields, { handle });
+                const config = _.findWhere(this.config.fields, { handle }) || {};
                 return config.replicator_preview === undefined ? true : config.replicator_preview;
             });
 

src/Fieldtypes/Bard.php

@@ -313,15 +313,15 @@ public function preload()
             $values = $set['attrs']['values'];
             $config = $this->config("sets.{$values['type']}.fields", []);
 
-            return [$set['attrs']['id'] => (new Fields($config))->addValues($values)->meta()];
+            return [$set['attrs']['id'] => (new Fields($config))->addValues($values)->meta()->put('_', '_')];
         })->toArray();
 
         $defaults = collect($this->config('sets'))->map(function ($set) {
             return (new Fields($set['fields']))->all()->map->defaultValue()->all();
         })->all();
 
         $new = collect($this->config('sets'))->map(function ($set, $handle) use ($defaults) {
-            return (new Fields($set['fields']))->addValues($defaults[$handle])->meta();
+            return (new Fields($set['fields']))->addValues($defaults[$handle])->meta()->put('_', '_');
         })->toArray();
 
         $previews = collect($existing)->map(function ($fields) {

src/Fieldtypes/Replicator.php

@@ -136,10 +136,10 @@ public function preload()
             'existing' => $existing = collect($this->field->value())->mapWithKeys(function ($set) {
                 $config = $this->config("sets.{$set['type']}.fields", []);
 
-                return [$set['_id'] => (new Fields($config))->addValues($set)->meta()];
+                return [$set['_id'] => (new Fields($config))->addValues($set)->meta()->put('_', '_')];
             })->toArray(),
             'new' => collect($this->config('sets'))->map(function ($set, $handle) {
-                return (new Fields($set['fields']))->meta();
+                return (new Fields($set['fields']))->meta()->put('_', '_');
             })->toArray(),
             'defaults' => collect($this->config('sets'))->map(function ($set) {
                 return (new Fields($set['fields']))->all()->map->defaultValue();