Added support for deleting metadata; Allow blank values

custom_md_loader/classes/CustomMetadataUploadController.cls

@@ -44,6 +44,33 @@ public class CustomMetadataUploadController {
             }
         }
     }
+
+    public PageReference deleteCustomMetaData() {
+        ApexPages.getMessages().clear();
+        showRecordsTable = false;
+        deleteCustomMetadtaRecords();
+        // TODO: Add Success Message / Display Errors
+        return null;
+    }
+
+    private void deleteCustomMetadtaRecords() {
+        if(selectedType == 'Select type') {
+            ApexPages.Message errorMessage = new ApexPages.Message(ApexPages.severity.ERROR, 'Please choose a valid custom metadata type.');
+            ApexPages.addMessage(errorMessage);
+            return;
+        }
+
+        String query = 'SELECT DeveloperName FROM ' + selectedType;
+
+        List<sObject> customRecords = Database.query(query);
+        List<String> recordsToDelete = new List<String>();
+
+        for (sObject record : customRecords) {
+            recordsToDelete.add(selectedType + '.' + record.get('DeveloperName'));
+        }
+
+        MetadataUtil.deleteMetadata('CustomMetadata', recordsToDelete);
+    }
 
     public PageReference upsertCustomMetadata() {
         ApexPages.getMessages().clear();

custom_md_loader/classes/MetadataUtil.cls

@@ -87,10 +87,6 @@ public class MetadataUtil {
             List<String> fieldValueList = new List<String>();
 
             for (String singleRowFieldValues :singleRowOfValues) {
-                if (String.isBlank(singleRowFieldValues)) {
-                    continue;
-                }
-
                 fieldValueList.addAll(singleRowFieldValues.split(';'));
             }
             for(String fieldName : fieldNameSet) {
@@ -152,6 +148,34 @@ public class MetadataUtil {
         customMetadata.values = customMetadataValues;
         return customMetadata;
     }
+
+    public static void deleteMetadata(String type_x,String[] fullNames) {
+        List<MetadataService.DeleteResult> results = getPort().deleteMetadata(type_x, fullNames);
+        if (results!=null) {
+            for (MetadataService.DeleteResult deleteResult : results) {
+                if (deleteResult==null || deleteResult.success) {
+                     continue;
+                }
+                // Construct error message and throw an exception
+                if (deleteResult.errors!=null) {
+                    List<String> messages = new List<String>();
+                    messages.add((deleteResult.errors.size()==1 ? 'Error ' : 'Errors ') + 'occured processing component ' + deleteResult.fullName + '.');
+                    for(MetadataService.Error error : deleteResult.errors){
+                        messages.add(error.message + ' (' + error.statusCode + ').' + ( error.fields!=null && error.fields.size()>0 ? ' Fields ' + String.join(error.fields, ',') + '.' : '' ) );
+                    }
+                    if(messages.size()>0){
+                        ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.Error, String.join(messages, ' ')));
+                        System.debug(LoggingLevel.ERROR, String.join(messages, ''));
+                        return;
+                    }
+                }
+                if(!deleteResult.success){
+                    ApexPages.addMessage(new ApexPages.Message(ApexPages.Severity.Error, 'Request failed with no specified error.'));
+                    return;
+                }
+            }
+        }
+    }
 
 
     private static void upsertMetadataAndValidate(MetadataService.Metadata[] records) {

custom_md_loader/pages/CustomMetadataRecordUploader.page

@@ -22,6 +22,15 @@
                 </apex:pageBlockSection>
                </apex:ActionRegion>
             </apex:pageBlock>
+
+            <div align="center" draggable="false" >
+               <apex:ActionRegion >
+                <apex:commandButton value="Delete Custom MetaData Type" action="{!deleteCustomMetaData}" rendered="true"/>
+                <apex:actionSupport event="onclick"  action="{!deleteCustomMetaData}" rendered="{!showRecordsTable}" oncomplete="window.opener.location.reload();"/>
+              </apex:ActionRegion> 
+            </div>
+            <br/>
+            <br/>
 
             <div align="center" draggable="false" >
                <apex:ActionRegion >