From 84a90aed50ec5f1fa71ef30153a9eefa9dd27cee Mon Sep 17 00:00:00 2001
From: Simon <therealslimv@yahoo.de>
Date: Thu, 24 Feb 2022 20:39:47 +0100
Subject: [PATCH] fix: columns config works with input type object

Closes #918
---
 papaparse.js        | 7 ++++---
 tests/test-cases.js | 7 +++++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/papaparse.js b/papaparse.js
index 91de82f..91fa3e0 100755
--- a/papaparse.js
+++ b/papaparse.js
@@ -306,9 +306,10 @@ License: MIT
 
 			if (Array.isArray(_input.data))
 			{
-				if (!_input.fields)
-					_input.fields =  _input.meta && _input.meta.fields;
-
+				if (!_input.fields) {
+					_input.fields = _input.meta && _input.meta.fields || _columns;
+					console.log('input', _input.fields);
+				}
 				if (!_input.fields)
 					_input.fields =  Array.isArray(_input.data[0])
 						? _input.fields
diff --git a/tests/test-cases.js b/tests/test-cases.js
index ab806ba..469c74c 100644
--- a/tests/test-cases.js
+++ b/tests/test-cases.js
@@ -1865,6 +1865,13 @@ var UNPARSE_TESTS = [
 		config: {columns: ['a', 'b', 'c']},
 		expected: 'a,b,c\r\n1,2,\r\n\r\n3,,4'
 	},
+	{
+		description: "Column option used to manually specify keys with input type object",
+		notes: "Should not throw any error when attempting to serialize key not present in object. Columns are different than keys of the first object. When an object is missing a key then the serialized value should be an empty string.",
+		input: { data: [{a: 1, b: '2'}, {}, {a: 3, d: 'd', c: 4,}] },
+		config: {columns: ['a', 'b', 'c']},
+		expected: 'a,b,c\r\n1,2,\r\n\r\n3,,4'
+	},
 	{
 		description: "Use different escapeChar",
 		input: [{a: 'foo', b: '"quoted"'}],