corrections for use default value [tag]

Author: Bohdan Berezhniy

Model/ResourceModel/Tag.php

@@ -48,19 +48,21 @@ protected function _beforeDelete(\Magento\Framework\Model\AbstractModel $object)
      */
     protected function _beforeSave(\Magento\Framework\Model\AbstractModel $object)
     {
-        $object->setTitle(
-            trim(($object->getTitle()))
-        );
-
-        $tag = $object->getCollection()
-            ->addFieldToFilter('title', $object->getTitle())
-            ->addFieldToFilter('tag_id', ['neq' => $object->getId()])
-            ->setPageSize(1)
-            ->getFirstItem();
-        if ($tag->getId()) {
-            throw new \Magento\Framework\Exception\LocalizedException(
-                __('The tag is already exist.')
+        if ($object->getTitle()) {
+            $object->setTitle(
+                trim(($object->getTitle()))
             );
+
+            $tag = $object->getCollection()
+                ->addFieldToFilter('title', $object->getTitle())
+                ->addFieldToFilter('tag_id', ['neq' => $object->getId()])
+                ->setPageSize(1)
+                ->getFirstItem();
+            if ($tag->getId()) {
+                throw new \Magento\Framework\Exception\LocalizedException(
+                    __('The tag is already exist.')
+                );
+            }
         }
 
         $identifierGenerator = \Magento\Framework\App\ObjectManager::getInstance()
@@ -180,7 +182,7 @@ public function checkIdentifier($identifier, $storeIds)
         $select = $this->_getLoadByIdentifierSelect($identifier, $storeIds);
         $select->reset(\Zend_Db_Select::COLUMNS)->columns(['cp.tag_id', 'cp.identifier'])->order('cps.store_id DESC')->limit(1);
 
-     
+
 
         $row = $this->getConnection()->fetchRow($select);
         if (isset($row['tag_id']) && isset($row['identifier'])

Model/ResourceModel/Tag/Collection.php

@@ -13,6 +13,16 @@
  */
 class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
 {
+    /**
+     * @inheritDoc
+     */
+    protected $_eventPrefix = 'mfblog_tag_collection';
+
+    /**
+     * @inheritDoc
+     */
+    protected $_eventObject = 'blog_tag_collection';
+
     /**
      * @inheritDoc
      */

view/adminhtml/ui_component/blog_tag_form.xml

@@ -96,20 +96,21 @@
                 </item>
             </argument>
         </field>
+        <field name="content">
+            <argument name="data" xsi:type="array">
+                <item name="config" xsi:type="array">
+                    <item name="label" xsi:type="string"/>
+                    <item name="formElement" xsi:type="string">wysiwyg</item>
+                    <item name="source" xsi:type="string">tag</item>
+                    <item name="wysiwyg" xsi:type="boolean">true</item>
+                    <item name="dataScope" xsi:type="string">content</item>
+                    <item name="additionalClasses" xsi:type="string">admin__field-wide</item>
+                    <item name="sortOrder" xsi:type="number">30</item>
+                    <item name="template" xsi:type="string">ui/form/field</item>
+                </item>
+            </argument>
+        </field>
     </fieldset>
-    <field name="content">
-        <argument name="data" xsi:type="array">
-            <item name="config" xsi:type="array">
-                <item name="label" xsi:type="string"/>
-                <item name="formElement" xsi:type="string">wysiwyg</item>
-                <item name="source" xsi:type="string">tag</item>
-                <item name="wysiwyg" xsi:type="boolean">true</item>
-                <item name="dataScope" xsi:type="string">content</item>
-                <item name="additionalClasses" xsi:type="string">admin__field-wide</item>
-                <item name="sortOrder" xsi:type="number">30</item>
-            </item>
-        </argument>
-    </field>
     <fieldset name="display_settings">
         <argument name="data" xsi:type="array">
             <item name="config" xsi:type="array">