fix: more explicit error when using sqlite driver with at least one c…

…onstraint

Signed-off-by: Manfred Touron <[email protected]>

errors.go

@@ -0,0 +1,7 @@
+package sqlite
+
+import "errors"
+
+var (
+	ErrConstraintsNotImplemented = errors.New("constraints not implemented on sqlite, consider using DisableForeignKeyConstraintWhenMigrating, more details https://github.com/go-gorm/gorm/wiki/GORM-V2-Release-Note-Draft#all-new-migrator")
+)

migrator.go

@@ -149,11 +149,11 @@ func (m Migrator) DropColumn(value interface{}, name string) error {
 }
 
 func (m Migrator) CreateConstraint(interface{}, string) error {
-	return gorm.ErrNotImplemented
+	return ErrConstraintsNotImplemented
 }
 
 func (m Migrator) DropConstraint(interface{}, string) error {
-	return gorm.ErrNotImplemented
+	return ErrConstraintsNotImplemented
 }
 
 func (m Migrator) HasConstraint(value interface{}, name string) bool {