Refactor ParseWithSchemaTable method and improve test. (go-gorm#4789)

* Refactor ParseWithSchemaTable method and improve test.

* Fix schema.ParseWithSchemaTable method for only use schemaTable in migrator and improve test.

* Rename `schemaTable` to `specialTableName` for clearly argument.

migrator/migrator.go

@@ -43,7 +43,7 @@ func (m Migrator) RunWithValue(value interface{}, fc func(*gorm.Statement) error
 
 	if table, ok := value.(string); ok {
 		stmt.Table = table
-	} else if err := stmt.Parse(value); err != nil {
+	} else if err := stmt.ParseWithSpecialTableName(value, stmt.Table); err != nil {
 		return err
 	}
 

schema/schema.go

@@ -73,15 +73,11 @@ type Tabler interface {
 
 // Parse get data type from dialector
 func Parse(dest interface{}, cacheStore *sync.Map, namer Namer) (*Schema, error) {
-	return parse(dest, cacheStore, namer, "")
+	return ParseWithSpecialTableName(dest, cacheStore, namer, "")
 }
 
-// ParseWithSchemaTable get data type from dialector with extra schema table
-func ParseWithSchemaTable(dest interface{}, cacheStore *sync.Map, namer Namer, schemaTable string) (*Schema, error) {
-	return parse(dest, cacheStore, namer, schemaTable)
-}
-
-func parse(dest interface{}, cacheStore *sync.Map, namer Namer, schemaTable string) (*Schema, error) {
+// ParseWithSpecialTableName get data type from dialector with extra schema table
+func ParseWithSpecialTableName(dest interface{}, cacheStore *sync.Map, namer Namer, specialTableName string) (*Schema, error) {
 	if dest == nil {
 		return nil, fmt.Errorf("%w: %+v", ErrUnsupportedDataType, dest)
 	}
@@ -107,7 +103,17 @@ func parse(dest interface{}, cacheStore *sync.Map, namer Namer, schemaTable stri
 		return nil, fmt.Errorf("%w: %s.%s", ErrUnsupportedDataType, modelType.PkgPath(), modelType.Name())
 	}
 
-	if v, ok := cacheStore.Load(modelType); ok {
+	// Cache the Schema for performance,
+	// Use the modelType or modelType + schemaTable (if it present) as cache key.
+	var schemaCacheKey interface{}
+	if specialTableName != "" {
+		schemaCacheKey = fmt.Sprintf("%p-%s", modelType, specialTableName)
+	} else {
+		schemaCacheKey = modelType
+	}
+
+	// Load exist schmema cache, return if exists
+	if v, ok := cacheStore.Load(schemaCacheKey); ok {
 		s := v.(*Schema)
 		// Wait for the initialization of other goroutines to complete
 		<-s.initialized
@@ -116,15 +122,15 @@ func parse(dest interface{}, cacheStore *sync.Map, namer Namer, schemaTable stri
 
 	modelValue := reflect.New(modelType)
 	tableName := namer.TableName(modelType.Name())
-	if schemaTable != "" {
-		tableName = schemaTable
-	}
 	if tabler, ok := modelValue.Interface().(Tabler); ok {
 		tableName = tabler.TableName()
 	}
 	if en, ok := namer.(embeddedNamer); ok {
 		tableName = en.Table
 	}
+	if specialTableName != "" && specialTableName != tableName {
+		tableName = specialTableName
+	}
 
 	schema := &Schema{
 		Name:           modelType.Name(),
@@ -140,7 +146,8 @@ func parse(dest interface{}, cacheStore *sync.Map, namer Namer, schemaTable stri
 	// When the schema initialization is completed, the channel will be closed
 	defer close(schema.initialized)
 
-	if v, loaded := cacheStore.Load(modelType); loaded {
+	// Load exist schmema cache, return if exists
+	if v, ok := cacheStore.Load(schemaCacheKey); ok {
 		s := v.(*Schema)
 		// Wait for the initialization of other goroutines to complete
 		<-s.initialized
@@ -247,13 +254,12 @@ func parse(dest interface{}, cacheStore *sync.Map, namer Namer, schemaTable stri
 		}
 	}
 
-	if schemaTable == "" {
-		if v, loaded := cacheStore.LoadOrStore(modelType, schema); loaded {
-			s := v.(*Schema)
-			// Wait for the initialization of other goroutines to complete
-			<-s.initialized
-			return s, s.err
-		}
+	// Cache the schema
+	if v, loaded := cacheStore.LoadOrStore(schemaCacheKey, schema); loaded {
+		s := v.(*Schema)
+		// Wait for the initialization of other goroutines to complete
+		<-s.initialized
+		return s, s.err
 	}
 
 	defer func() {

statement.go

@@ -456,7 +456,11 @@ func (stmt *Statement) Build(clauses ...string) {
 }
 
 func (stmt *Statement) Parse(value interface{}) (err error) {
-	if stmt.Schema, err = schema.ParseWithSchemaTable(value, stmt.DB.cacheStore, stmt.DB.NamingStrategy, stmt.DB.Statement.Table); err == nil && stmt.Table == "" {
+	return stmt.ParseWithSpecialTableName(value, "")
+}
+
+func (stmt *Statement) ParseWithSpecialTableName(value interface{}, specialTableName string) (err error) {
+	if stmt.Schema, err = schema.ParseWithSpecialTableName(value, stmt.DB.cacheStore, stmt.DB.NamingStrategy, specialTableName); err == nil && stmt.Table == "" {
 		if tables := strings.Split(stmt.Schema.Table, "."); len(tables) == 2 {
 			stmt.TableExpr = &clause.Expr{SQL: stmt.Quote(stmt.Schema.Table)}
 			stmt.Table = tables[1]

tests/migrate_test.go

@@ -382,32 +382,41 @@ func TestMigrateConstraint(t *testing.T) {
 	}
 }
 
-type MigrateUser struct {
+type DynamicUser struct {
 	gorm.Model
-	Name string `gorm:"index"`
+	Name      string
+	CompanyID string `gorm:"index"`
 }
 
+// To test auto migrate crate indexes for dynamic table name
 // https://github.com/go-gorm/gorm/issues/4752
 func TestMigrateIndexesWithDynamicTableName(t *testing.T) {
-	tableNameSuffixes := []string{"01", "02", "03"}
-	for _, v := range tableNameSuffixes {
-		tableName := "migrate_user_" + v
+	// Create primary table
+	if err := DB.AutoMigrate(&DynamicUser{}); err != nil {
+		t.Fatalf("AutoMigrate create table error: %#v", err)
+	}
+
+	// Create sub tables
+	for _, v := range []string{"01", "02", "03"} {
+		tableName := "dynamic_users_" + v
 		m := DB.Scopes(func(db *gorm.DB) *gorm.DB {
 			return db.Table(tableName)
 		}).Migrator()
 
-		if err := m.AutoMigrate(&MigrateUser{}); err != nil {
-			t.Fatalf("Failed to create table for %#v", tableName)
+		if err := m.AutoMigrate(&DynamicUser{}); err != nil {
+			t.Fatalf("AutoMigrate create table error: %#v", err)
 		}
 
 		if !m.HasTable(tableName) {
-			t.Fatalf("Failed to create table for %#v", tableName)
+			t.Fatalf("AutoMigrate expected %#v exist, but not.", tableName)
 		}
-		if !m.HasIndex(&MigrateUser{}, "Name") {
-			t.Fatalf("Should find index for %s's name after AutoMigrate", tableName)
+
+		if !m.HasIndex(&DynamicUser{}, "CompanyID") {
+			t.Fatalf("Should have index on %s", "CompanyI.")
 		}
-		if !m.HasIndex(&MigrateUser{}, "DeletedAt") {
-			t.Fatalf("Should find index for %s's deleted_at after AutoMigrate", tableName)
+
+		if !m.HasIndex(&DynamicUser{}, "DeletedAt") {
+			t.Fatalf("Should have index on deleted_at.")
 		}
 	}
 }