From 2d29997bdae241186e05e2a44846375de7547b28 Mon Sep 17 00:00:00 2001
From: Andrej Ocenas <mr.ocenas@gmail.com>
Date: Mon, 11 May 2020 16:10:49 +0200
Subject: [PATCH] CloudWatch/Logs: Fix suggestions of fields after comma
 (#24520)

---
 .../plugins/datasource/cloudwatch/language_provider.test.ts   | 4 ++++
 public/app/plugins/datasource/cloudwatch/language_provider.ts | 2 +-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/public/app/plugins/datasource/cloudwatch/language_provider.test.ts b/public/app/plugins/datasource/cloudwatch/language_provider.test.ts
index f711498774a..5168b8990b8 100644
--- a/public/app/plugins/datasource/cloudwatch/language_provider.test.ts
+++ b/public/app/plugins/datasource/cloudwatch/language_provider.test.ts
@@ -40,6 +40,10 @@ describe('CloudWatchLanguageProvider', () => {
     await runSuggestionTest('fields field1, \\', [fields, FUNCTIONS.map(v => v.label)]);
   });
 
+  it('should suggest fields and functions after comma with prefix', async () => {
+    await runSuggestionTest('fields field1, @mess\\', [fields, FUNCTIONS.map(v => v.label)]);
+  });
+
   it('should suggest fields and functions after display command', async () => {
     await runSuggestionTest('display \\', [fields, FUNCTIONS.map(v => v.label)]);
   });
diff --git a/public/app/plugins/datasource/cloudwatch/language_provider.ts b/public/app/plugins/datasource/cloudwatch/language_provider.ts
index 125bbdbee81..7683d46efb6 100644
--- a/public/app/plugins/datasource/cloudwatch/language_provider.ts
+++ b/public/app/plugins/datasource/cloudwatch/language_provider.ts
@@ -165,7 +165,7 @@ export class CloudWatchLanguageProvider extends LanguageProvider {
 
     const currentTokenIsComma = curToken.content === ',' && curToken.types.includes('punctuation');
     const currentTokenIsCommaOrAfterComma =
-      currentTokenIsComma || (curToken.prev?.content === ',' && curToken.prev.types.includes('punctuation'));
+      currentTokenIsComma || (prevToken?.content === ',' && prevToken?.types.includes('punctuation'));
 
     // We only show suggestions if we are after a command or after a comma which is a field separator
     if (!(currentTokenIsAfterCommand || currentTokenIsCommaOrAfterComma)) {