Added ability to skip duplicate error messages and show all error messages in errorSummary.

Update CHANGELOG.md

framework/CHANGELOG.md

@@ -8,6 +8,7 @@ Yii Framework 2 Change Log
 - Bug #12428: Fixed `yii\db\mysql\QueryBuilder` causes warning when insert default rows into a table without primary key (DrmagicE)
 - Enh #9989: ActiveForm now respects formtarget, formmethod and formenctype attributes of submit button (AnatolyRugalev)
 - Enh #12296: Added value validation to `yii\log\Target::setLevels()` (Mak-Di)
+- Enh #12193: Added the ability to suppress the generation of duplicate error messages in `Html::errorSummary`. Added the ability to display error messages beyond the first error for each model attribute (PowerGamer1)
 - Enh #12073: Added the ability to suppress the generation of input hint when it is specified through  `Model::attributeHints()` (PowerGamer1)
 - Bug #7670: Added `UrlNormalizer` for normalizing requests with and without trailing slashes (rob006, cronfy, klimov-paul)
 - Bug #9277: Fixed `yii\console\controllers\AssetController` looses custom options of 'target' bundles (petrabarus, klimov-paul)

framework/helpers/BaseHtml.php

@@ -1154,6 +1154,8 @@ class BaseHtml
      * - header: string, the header HTML for the error summary. If not set, a default prompt string will be used.
      * - footer: string, the footer HTML for the error summary.
      * - encode: boolean, if set to false then the error messages won't be encoded.
+     * - showAllErrors: boolean, if set to true every error message for each attribute will be shown otherwise
+     * only the first error message for each attribute will be shown.
      *
      * The rest of the options will be rendered as the attributes of the container tag. The values will
      * be HTML-encoded using [[encode()]]. If a value is null, the corresponding attribute will not be rendered.
@@ -1164,6 +1166,7 @@ class BaseHtml
         $header = isset($options['header']) ? $options['header'] : '<p>' . Yii::t('yii', 'Please fix the following errors:') . '</p>';
         $footer = ArrayHelper::remove($options, 'footer', '');
         $encode = ArrayHelper::remove($options, 'encode', true);
+        $showAllErrors = ArrayHelper::remove($options, 'showAllErrors', false);
         unset($options['header']);
 
         $lines = [];
@@ -1172,8 +1175,16 @@ class BaseHtml
         }
         foreach ($models as $model) {
             /* @var $model Model */
-            foreach ($model->getFirstErrors() as $error) {
-                $lines[] = $encode ? Html::encode($error) : $error;
+            foreach ($model->getErrors() as $errors) {
+                foreach ($errors as $error) {
+                    $line = $encode ? Html::encode($error) : $error;
+                    if (array_search($line, $lines) === false) {
+                        $lines[] = $line;
+                    }
+                    if (!$showAllErrors) {
+                        break;
+                    }
+                }
             }
         }