feat: fix duplicated index creation bug in PostgreSQL (#68)

Author: yxrxy

.github/workflows/ci.yml

@@ -29,11 +29,11 @@ jobs:
 
     steps:
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v4
         with:
-          go-version: 1.19
+          go-version: 1.21
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Run Unit tests
         run: go test -v -coverprofile=profile.cov ./...
 
@@ -52,7 +52,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Run semantic-release
         if: github.repository == 'casbin/xorm-adapter' && github.event_name == 'push'

adapter.go

@@ -37,13 +37,13 @@ func (the *CasbinRule) TableName() string {
 
 // CasbinRule  .
 type CasbinRule struct {
-	Ptype string `xorm:"varchar(100) index not null default ''"`
-	V0    string `xorm:"varchar(100) index not null default ''"`
-	V1    string `xorm:"varchar(100) index not null default ''"`
-	V2    string `xorm:"varchar(100) index not null default ''"`
-	V3    string `xorm:"varchar(100) index not null default ''"`
-	V4    string `xorm:"varchar(100) index not null default ''"`
-	V5    string `xorm:"varchar(100) index not null default ''"`
+	Ptype string `xorm:"varchar(100) index(IF NOT EXISTS) not null default ''"`
+	V0    string `xorm:"varchar(100) index(IF NOT EXISTS) not null default ''"`
+	V1    string `xorm:"varchar(100) index(IF NOT EXISTS) not null default ''"`
+	V2    string `xorm:"varchar(100) index(IF NOT EXISTS) not null default ''"`
+	V3    string `xorm:"varchar(100) index(IF NOT EXISTS) not null default ''"`
+	V4    string `xorm:"varchar(100) index(IF NOT EXISTS) not null default ''"`
+	V5    string `xorm:"varchar(100) index(IF NOT EXISTS) not null default ''"`
 
 	tableName string `xorm:"-"`
 }