From 4786e830d66afc1895e995df1b47f2dd2b348c4e Mon Sep 17 00:00:00 2001
From: Jinzhu <wosmvp@gmail.com>
Date: Mon, 9 May 2016 22:32:33 +0800
Subject: [PATCH] Fix create join table

---
 model_struct.go | 10 ++++++++--
 scope.go        |  2 ++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/model_struct.go b/model_struct.go
index c1885eae..eb3762f4 100644
--- a/model_struct.go
+++ b/model_struct.go
@@ -71,7 +71,7 @@ type StructField struct {
 }
 
 func (structField *StructField) clone() *StructField {
-	return &StructField{
+	clone := &StructField{
 		DBName:          structField.DBName,
 		Name:            structField.Name,
 		Names:           structField.Names,
@@ -81,11 +81,17 @@ func (structField *StructField) clone() *StructField {
 		IsScanner:       structField.IsScanner,
 		HasDefaultValue: structField.HasDefaultValue,
 		Tag:             structField.Tag,
-		TagSettings:     structField.TagSettings,
+		TagSettings:     map[string]string{},
 		Struct:          structField.Struct,
 		IsForeignKey:    structField.IsForeignKey,
 		Relationship:    structField.Relationship,
 	}
+
+	for key, value := range structField.TagSettings {
+		clone.TagSettings[key] = value
+	}
+
+	return clone
 }
 
 // Relationship described the relationship between models
diff --git a/scope.go b/scope.go
index 844df85c..0116da08 100644
--- a/scope.go
+++ b/scope.go
@@ -1027,6 +1027,7 @@ func (scope *Scope) createJoinTable(field *StructField) {
 					foreignKeyStruct := field.clone()
 					foreignKeyStruct.IsPrimaryKey = false
 					foreignKeyStruct.TagSettings["IS_JOINTABLE_FOREIGNKEY"] = "true"
+					delete(foreignKeyStruct.TagSettings, "AUTO_INCREMENT")
 					sqlTypes = append(sqlTypes, scope.Quote(relationship.ForeignDBNames[idx])+" "+scope.Dialect().DataTypeOf(foreignKeyStruct))
 					primaryKeys = append(primaryKeys, scope.Quote(relationship.ForeignDBNames[idx]))
 				}
@@ -1037,6 +1038,7 @@ func (scope *Scope) createJoinTable(field *StructField) {
 					foreignKeyStruct := field.clone()
 					foreignKeyStruct.IsPrimaryKey = false
 					foreignKeyStruct.TagSettings["IS_JOINTABLE_FOREIGNKEY"] = "true"
+					delete(foreignKeyStruct.TagSettings, "AUTO_INCREMENT")
 					sqlTypes = append(sqlTypes, scope.Quote(relationship.AssociationForeignDBNames[idx])+" "+scope.Dialect().DataTypeOf(foreignKeyStruct))
 					primaryKeys = append(primaryKeys, scope.Quote(relationship.AssociationForeignDBNames[idx]))
 				}