fix(model): drop leftover prefill_groups unique constraints before AutoMigrate (#7100)

model/main.go

@@ -321,6 +321,9 @@ func migrateDB() error {
 	if err := migrateTokenModelLimitsToText(); err != nil {
 		return err
 	}
+	if err := migratePrefillGroupUniqueIndex(DB); err != nil {
+		return err
+	}
 
 	err := DB.AutoMigrate(
 		&Channel{},
@@ -381,6 +384,9 @@ func migrateDB() error {
 }
 
 func migrateDBFast() error {
+	if err := migratePrefillGroupUniqueIndex(DB); err != nil {
+		return err
+	}
 
 	var wg sync.WaitGroup
 

model/prefill_group_migration.go

@@ -0,0 +1,81 @@
+package model
+
+import (
+	"fmt"
+
+	"github.com/QuantumNous/new-api/common"
+
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+// migratePrefillGroupUniqueIndex drops leftover single-column UNIQUE
+// constraints on prefill_groups.name before AutoMigrate.
+//
+// GORM 1.25.x MigrateColumnUnique treats a catalog unique column as the
+// `unique` tag and issues DROP CONSTRAINT uni_<table>_<column>. Older
+// uniqueIndex migrations stored that uniqueness as idx_<table>_<column> or
+// PostgreSQL's <table>_<column>_key, so the uni_* constraint does not exist
+// and AutoMigrate aborts with SQLSTATE 42704. Removing the catalog unique
+// constraint first lets AutoMigrate create uk_prefill_name (partial unique
+// index) instead.
+func migratePrefillGroupUniqueIndex(db *gorm.DB) error {
+	if db == nil || db.Dialector == nil || db.Dialector.Name() != "postgres" {
+		return nil
+	}
+	if !db.Migrator().HasTable(&PrefillGroup{}) {
+		return nil
+	}
+	stmt := &gorm.Statement{DB: db}
+	if err := stmt.Parse(&PrefillGroup{}); err != nil {
+		return err
+	}
+	return dropPrefillGroupLegacyNameUniques(db, stmt.Schema.Table)
+}
+
+func dropPrefillGroupLegacyNameUniques(db *gorm.DB, table string) error {
+	if db == nil || table == "" {
+		return nil
+	}
+	column := "name"
+	var constraintNames []string
+	if err := db.Raw(`
+SELECT tc.constraint_name
+FROM information_schema.table_constraints AS tc
+INNER JOIN information_schema.key_column_usage AS kcu
+  ON tc.constraint_catalog = kcu.constraint_catalog
+ AND tc.constraint_schema = kcu.constraint_schema
+ AND tc.constraint_name = kcu.constraint_name
+ AND tc.table_name = kcu.table_name
+WHERE tc.constraint_schema = current_schema()
+  AND tc.table_name = ?
+  AND tc.constraint_type = 'UNIQUE'
+GROUP BY tc.constraint_name
+HAVING COUNT(*) = 1 AND MIN(kcu.column_name) = ?`, table, column).Scan(&constraintNames).Error; err != nil {
+		return fmt.Errorf("list unique constraints on %s.%s: %w", table, column, err)
+	}
+	for _, name := range constraintNames {
+		if name == "" {
+			continue
+		}
+		if err := db.Exec("ALTER TABLE ? DROP CONSTRAINT IF EXISTS ?",
+			clause.Table{Name: table}, clause.Column{Name: name}).Error; err != nil {
+			return fmt.Errorf("drop unique constraint %s on %s: %w", name, table, err)
+		}
+		common.SysLog(fmt.Sprintf("dropped leftover unique constraint %s on %s.%s", name, table, column))
+	}
+
+	legacyIndexNames := []string{
+		db.NamingStrategy.IndexName(table, column),
+		db.NamingStrategy.UniqueName(table, column),
+	}
+	for _, name := range legacyIndexNames {
+		if name == "" || name == "uk_prefill_name" {
+			continue
+		}
+		if err := db.Exec("DROP INDEX IF EXISTS ?", clause.Column{Name: name}).Error; err != nil {
+			return fmt.Errorf("drop leftover unique index %s on %s: %w", name, table, err)
+		}
+	}
+	return nil
+}