From 7ada703aef4a567711eb8e87c40b913cc03cc926 Mon Sep 17 00:00:00 2001
From: Alexey Kremsa <alexey.kremsa@gismart.com>
Date: Tue, 17 Jul 2018 12:52:39 +0300
Subject: [PATCH] Fixed mysql query syntax for FK removal

---
 scope.go | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/scope.go b/scope.go
index 397ccf0b..5a46a352 100644
--- a/scope.go
+++ b/scope.go
@@ -1216,11 +1216,17 @@ func (scope *Scope) addForeignKey(field string, dest string, onDelete string, on
 
 func (scope *Scope) removeForeignKey(field string, dest string) {
 	keyName := scope.Dialect().BuildKeyName(scope.TableName(), field, dest, "foreign")
-
 	if !scope.Dialect().HasForeignKey(scope.TableName(), keyName) {
 		return
 	}
-	var query = `ALTER TABLE %s DROP CONSTRAINT %s;`
+	var mysql mysql
+	var query string
+	if scope.Dialect().GetName() == mysql.GetName() {
+		query = `ALTER TABLE %s DROP FOREIGN KEY %s;`
+	} else {
+		query = `ALTER TABLE %s DROP CONSTRAINT %s;`
+	}
+
 	scope.Raw(fmt.Sprintf(query, scope.QuotedTableName(), scope.quoteIfPossible(keyName))).Exec()
 }