From 59a32e9352681ba2bea67c96ba4eea7f36cf6b60 Mon Sep 17 00:00:00 2001
From: syuilo <Syuilotan@yahoo.co.jp>
Date: Thu, 31 Oct 2019 15:51:33 +0900
Subject: [PATCH] Fix chart bug

---
 src/services/chart/charts/classes/test.ts | 13 ++++++++++++
 src/services/chart/core.ts                |  2 +-
 test/chart.ts                             | 24 +++++++++++++++++++++++
 3 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/src/services/chart/charts/classes/test.ts b/src/services/chart/charts/classes/test.ts
index 0ca63d174c..ea64040f3e 100644
--- a/src/services/chart/charts/classes/test.ts
+++ b/src/services/chart/charts/classes/test.ts
@@ -42,4 +42,17 @@ export default class TestChart extends Chart<TestLog> {
 			foo: update
 		});
 	}
+
+	@autobind
+	public async decrement() {
+		const update: Obj = {};
+
+		update.total = -1;
+		update.dec = 1;
+		this.total--;
+
+		await this.inc({
+			foo: update
+		});
+	}
 }
diff --git a/src/services/chart/core.ts b/src/services/chart/core.ts
index 9dc250f753..df4272c2d6 100644
--- a/src/services/chart/core.ts
+++ b/src/services/chart/core.ts
@@ -122,7 +122,7 @@ export default abstract class Chart<T extends Record<string, any>> {
 
 		for (const [k, v] of Object.entries(columns)) {
 			if (v > 0) query[k] = () => `"${k}" + ${v}`;
-			if (v < 0) query[k] = () => `"${k}" - ${v}`;
+			if (v < 0) query[k] = () => `"${k}" - ${Math.abs(v)}`;
 		}
 
 		return query;
diff --git a/test/chart.ts b/test/chart.ts
index bd26f3bf36..85b9d25251 100644
--- a/test/chart.ts
+++ b/test/chart.ts
@@ -106,6 +106,30 @@ describe('Chart', () => {
 		});
 	}));
 
+	
+	it('Can updates (dec)', async(async () => {
+		await testChart.decrement();
+
+		const chartHours = await testChart.getChart('hour', 3);
+		const chartDays = await testChart.getChart('day', 3);
+
+		assert.deepStrictEqual(chartHours, {
+			foo: {
+				dec: [1, 0, 0],
+				inc: [0, 0, 0],
+				total: [-1, 0, 0]
+			},
+		});
+
+		assert.deepStrictEqual(chartDays, {
+			foo: {
+				dec: [1, 0, 0],
+				inc: [0, 0, 0],
+				total: [-1, 0, 0]
+			},
+		});
+	}));
+
 	it('Empty chart', async(async () => {
 		const chartHours = await testChart.getChart('hour', 3);
 		const chartDays = await testChart.getChart('day', 3);