From fb49819cd74746771073a87effe664f91b40c7bc Mon Sep 17 00:00:00 2001
From: deepeshgarg007 <deepeshgarg6@gmail.com>
Date: Mon, 18 Mar 2019 08:47:17 +0530
Subject: [PATCH] fix: Replace NULL values with zero having data type as INT,
 FLOAT or DECIMAL

---
 frappe/patches.txt                            |  1 +
 .../v12_0/replace_null_values_in_tables.py    | 22 +++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 frappe/patches/v12_0/replace_null_values_in_tables.py

diff --git a/frappe/patches.txt b/frappe/patches.txt
index 467efe6a62..619216c0af 100644
--- a/frappe/patches.txt
+++ b/frappe/patches.txt
@@ -236,3 +236,4 @@ execute:frappe.delete_doc("Page", "modules", ignore_missing=True)
 frappe.patches.v11_0.set_default_letter_head_source
 frappe.patches.v12_0.setup_comments_from_communications
 frappe.patches.v12_0.init_desk_settings #11-03-2019
+frappe.patches.v12_0.replace_null_values_in_tables
diff --git a/frappe/patches/v12_0/replace_null_values_in_tables.py b/frappe/patches/v12_0/replace_null_values_in_tables.py
new file mode 100644
index 0000000000..f3831c1643
--- /dev/null
+++ b/frappe/patches/v12_0/replace_null_values_in_tables.py
@@ -0,0 +1,22 @@
+import frappe
+
+def execute():
+
+	fields = frappe.db.sql("""
+			SELECT COLUMN_NAME , TABLE_NAME, DATA_TYPE FROM INFORMATION_SCHEMA.COLUMNS
+			WHERE DATA_TYPE IN ('INT', 'FLOAT', 'DECIMAL') AND IS_NULLABLE = 'YES'
+		""", as_dict=1)
+
+	update_column_table_map = {}
+
+	for field in fields:
+		update_column_table_map.setdefault(field.TABLE_NAME, [])
+
+		if field.TABLE_NAME not in ['tabDocPerm', 'tabCustom Field', 'tabWebsite Route Permission']:
+			update_column_table_map[field.TABLE_NAME].append(str(field.COLUMN_NAME)+"=COALESCE("+str(field.COLUMN_NAME)+", 0)")
+
+	for table in frappe.db.get_tables():
+		if update_column_table_map.get(table):
+			frappe.db.sql("""UPDATE `{table}` SET {columns}"""
+				.format(table=table, columns=",".join(update_column_table_map.get(table))))
+