feat: add WithAutoRegistry option for automatic model registration

auto_registry_test.go

@@ -0,0 +1,287 @@
+package gen
+
+import (
+	"os"
+	"path/filepath"
+	"strings"
+	"testing"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gen/internal/model"
+	"gorm.io/gorm"
+)
+
+func TestAutoRegistryInitGeneration(t *testing.T) {
+	// 创建临时目录
+	tempDir := t.TempDir()
+
+	// 创建测试数据库
+	db, err := gorm.Open(sqlite.Open(":memory:"), &gorm.Config{})
+	if err != nil {
+		t.Fatalf("failed to create test database: %v", err)
+	}
+
+	// 创建简单的测试表
+	err = db.Exec(`CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT)`).Error
+	if err != nil {
+		t.Fatalf("failed to create users table: %v", err)
+	}
+
+	err = db.Exec(`CREATE TABLE orders (id INTEGER PRIMARY KEY, amount DECIMAL)`).Error
+	if err != nil {
+		t.Fatalf("failed to create orders table: %v", err)
+	}
+
+	tests := []struct {
+		name           string
+		configTables   []string
+		expectInitFunc map[string]bool // table -> shouldHaveInit
+	}{
+		{
+			name:         "AllTables",
+			configTables: []string{}, // 空数组表示所有表
+			expectInitFunc: map[string]bool{
+				"users":  true,
+				"orders": true,
+			},
+		},
+		{
+			name:         "OnlyUsersTable",
+			configTables: []string{"users"},
+			expectInitFunc: map[string]bool{
+				"users":  true,
+				"orders": false,
+			},
+		},
+		{
+			name:         "BothTables",
+			configTables: []string{"users", "orders"},
+			expectInitFunc: map[string]bool{
+				"users":  true,
+				"orders": true,
+			},
+		},
+		{
+			name:         "NoTables",
+			configTables: []string{"nonexistent"},
+			expectInitFunc: map[string]bool{
+				"users":  false,
+				"orders": false,
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			modelDir := filepath.Join(tempDir, tt.name, "model")
+
+			// 配置生成器
+			g := NewGenerator(Config{
+				OutPath:      filepath.Join(tempDir, tt.name, "query"),
+				ModelPkgPath: modelDir,
+				Mode:         WithDefaultQuery | WithAutoRegistry,
+			})
+
+			// 根据测试配置启用自动注册
+			if len(tt.configTables) == 0 {
+				g.WithAutoRegistry() // 不传参数，所有表
+			} else {
+				g.WithAutoRegistry(tt.configTables...) // 传入指定表名
+			}
+
+			g.UseDB(db)
+			g.GenerateAllTable()
+			g.Execute()
+
+			// 验证每个表的 init 函数生成情况
+			for tableName, shouldHaveInit := range tt.expectInitFunc {
+				t.Run(tableName, func(t *testing.T) {
+					checkInitFunction(t, modelDir, tableName, shouldHaveInit)
+				})
+			}
+
+			// 验证注册表文件是否生成
+			registryFile := filepath.Join(modelDir, "gen.go")
+			if _, err := os.Stat(registryFile); os.IsNotExist(err) {
+				t.Errorf("registry file %s should exist", registryFile)
+			}
+		})
+	}
+}
+
+// checkInitFunction 检查指定表的模型文件是否包含正确的 init 函数
+func checkInitFunction(t *testing.T, modelDir, tableName string, shouldHaveInit bool) {
+	fileName := filepath.Join(modelDir, tableName+".gen.go")
+
+	// 检查文件是否存在
+	if _, err := os.Stat(fileName); os.IsNotExist(err) {
+		t.Errorf("model file %s does not exist", fileName)
+		return
+	}
+
+	// 读取文件内容
+	content, err := os.ReadFile(fileName)
+	if err != nil {
+		t.Errorf("failed to read file %s: %v", fileName, err)
+		return
+	}
+
+	fileContent := string(content)
+
+	// 检查是否包含 init 函数
+	hasInitFunc := strings.Contains(fileContent, "func init() {")
+	hasRegisterCall := strings.Contains(fileContent, "RegisterModel(")
+
+	if shouldHaveInit {
+		if !hasInitFunc {
+			t.Errorf("file %s should contain 'func init() {' but doesn't", fileName)
+		}
+		if !hasRegisterCall {
+			t.Errorf("file %s should contain 'RegisterModel(' call but doesn't", fileName)
+		}
+
+		// 验证 RegisterModel 调用格式
+		if hasInitFunc && hasRegisterCall {
+			expectedModelName := getExpectedModelName(tableName)
+			expectedCall := "RegisterModel(&" + expectedModelName + "{}, TableName" + expectedModelName + ")"
+
+			if !strings.Contains(fileContent, expectedCall) {
+				t.Errorf("file %s should contain %s", fileName, expectedCall)
+				t.Logf("Actual file content:\n%s", fileContent)
+			}
+		}
+	} else {
+		if hasInitFunc && hasRegisterCall {
+			t.Errorf("file %s should not contain init function with RegisterModel call", fileName)
+		}
+	}
+}
+
+// getExpectedModelName 根据表名获取期望的模型名
+func getExpectedModelName(tableName string) string {
+	switch tableName {
+	case "users":
+		return "User"
+	case "orders":
+		return "Order"
+	default:
+		// 简单的首字母大写
+		return model.TitleCase(tableName)
+	}
+}
+
+// TestShouldEnableAutoRegistry 测试表过滤逻辑
+func TestShouldEnableAutoRegistry(t *testing.T) {
+	tests := []struct {
+		name           string
+		configuredList []string
+		tableName      string
+		expected       bool
+	}{
+		{
+			name:           "EmptyList_AllTablesEnabled",
+			configuredList: []string{},
+			tableName:      "users",
+			expected:       true,
+		},
+		{
+			name:           "TableInList_ShouldEnable",
+			configuredList: []string{"users", "orders"},
+			tableName:      "users",
+			expected:       true,
+		},
+		{
+			name:           "TableNotInList_ShouldDisable",
+			configuredList: []string{"users", "orders"},
+			tableName:      "products",
+			expected:       false,
+		},
+		{
+			name:           "SingleTable_Match",
+			configuredList: []string{"users"},
+			tableName:      "users",
+			expected:       true,
+		},
+		{
+			name:           "SingleTable_NoMatch",
+			configuredList: []string{"users"},
+			tableName:      "orders",
+			expected:       false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			g := &Generator{
+				Config: Config{
+					RegistryTableList: tt.configuredList,
+				},
+			}
+
+			result := g.shouldEnableAutoRegistry(tt.tableName)
+			if result != tt.expected {
+				t.Errorf("shouldEnableAutoRegistry(%s) = %v, want %v",
+					tt.tableName, result, tt.expected)
+			}
+		})
+	}
+}
+
+// TestWithAutoRegistryConfig 测试配置方法
+func TestWithAutoRegistryConfig(t *testing.T) {
+	tests := []struct {
+		name         string
+		tableNames   []string
+		expectedList []string
+		expectedMode GenerateMode
+	}{
+		{
+			name:         "NoTables",
+			tableNames:   []string{},
+			expectedList: []string{},
+			expectedMode: WithAutoRegistry,
+		},
+		{
+			name:         "SingleTable",
+			tableNames:   []string{"users"},
+			expectedList: []string{"users"},
+			expectedMode: WithAutoRegistry,
+		},
+		{
+			name:         "MultipleTables",
+			tableNames:   []string{"users", "orders", "products"},
+			expectedList: []string{"users", "orders", "products"},
+			expectedMode: WithAutoRegistry,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			cfg := Config{}
+
+			// 调用 WithAutoRegistry 方法
+			cfg.WithAutoRegistry(tt.tableNames...)
+
+			// 验证配置结果
+			if cfg.Mode&WithAutoRegistry == 0 {
+				t.Error("WithAutoRegistry mode should be enabled")
+			}
+
+			if len(cfg.RegistryTableList) != len(tt.expectedList) {
+				t.Errorf("RegistryTableList length = %d, want %d",
+					len(cfg.RegistryTableList), len(tt.expectedList))
+			}
+
+			for i, expected := range tt.expectedList {
+				if i >= len(cfg.RegistryTableList) || cfg.RegistryTableList[i] != expected {
+					actual := "<out of bounds>"
+					if i < len(cfg.RegistryTableList) {
+						actual = cfg.RegistryTableList[i]
+					}
+					t.Errorf("RegistryTableList[%d] = %s, want %s",
+						i, actual, expected)
+				}
+			}
+		})
+	}
+}

config.go

@@ -27,6 +27,9 @@ const (
 
 	// WithGeneric generate code with generic
 	WithGeneric
+
+	// WithAutoRegistry generate init functions to auto-register models
+	WithAutoRegistry
 )
 
 // Config generator's basic configuration
@@ -38,6 +41,9 @@ type Config struct {
 	ModelPkgPath string // generated model code's package name
 	WithUnitTest bool   // generate unit test for query code
 
+	// auto registry configuration
+	RegistryTableList []string // specific table names to enable auto registry, empty means all tables
+
 	// generate model global configuration
 	FieldNullable     bool // generate pointer when field is nullable
 	FieldCoverable    bool // generate pointer when field has default value, to fix problem zero value cannot be assign: https://gorm.io/docs/create.html#Default-Values
@@ -106,6 +112,13 @@ func (cfg *Config) WithJSONTagNameStrategy(ns func(columnName string) (tagConten
 	cfg.fieldJSONTagNS = ns
 }
 
+// WithAutoRegistry enable auto registry feature for generated models
+// tableNames: optional table names to enable auto registry, if empty, all tables will be enabled
+func (cfg *Config) WithAutoRegistry(tableNames ...string) {
+	cfg.Mode |= WithAutoRegistry
+	cfg.RegistryTableList = tableNames
+}
+
 // WithImportPkgPath specify import package path
 func (cfg *Config) WithImportPkgPath(paths ...string) {
 	for i, path := range paths {

examples/biz/query.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"fmt"
 
-	"gorm.io/gen/examples/dal/query"
+	"examples/dal/query"
 )
 
 var q = query.Q

examples/cmd/gen/generate.go

@@ -1,24 +1,29 @@
 package main
 
 import (
+	"examples/conf"
+	"examples/dal"
+
 	"gorm.io/gen"
-	"gorm.io/gen/examples/conf"
-	"gorm.io/gen/examples/dal"
 )
 
 func init() {
-	dal.DB = dal.ConnectDB(conf.MySQLDSN).Debug()
+	dal.DB = dal.ConnectDB(conf.SQLiteDBName).Debug()
 
 	prepare(dal.DB) // prepare table for generate
 }
 
 func main() {
 	g := gen.NewGenerator(gen.Config{
-		OutPath: "../../dal/query",
+		OutPath:      "../../dal/query",
+		ModelPkgPath: "../../dal/model",
 	})
 
 	g.UseDB(dal.DB)
 
+	// auto registry to models
+	g.WithAutoRegistry()
+
 	// generate all table from database
 	g.ApplyBasic(g.GenerateAllTable()...)
 

examples/cmd/gen/prepare.go

@@ -7,13 +7,15 @@ import (
 // prepare table for test
 
 const mytableSQL = "CREATE TABLE IF NOT EXISTS `mytables` (" +
-	"    `ID` int(11) NOT NULL," +
-	"    `username` varchar(16) DEFAULT NULL," +
-	"    `age` int(8) NOT NULL," +
-	"    `phone` varchar(11) NOT NULL," +
-	"    INDEX `idx_username` (`username`)" +
-	") ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;"
+	"    `ID` INTEGER NOT NULL PRIMARY KEY," +
+	"    `username` TEXT," +
+	"    `age` INTEGER NOT NULL," +
+	"    `phone` TEXT NOT NULL" +
+	");"
+
+const indexSQL = "CREATE INDEX IF NOT EXISTS `idx_username` ON `mytables` (`username`);"
 
 func prepare(db *gorm.DB) {
 	db.Exec(mytableSQL)
+	db.Exec(indexSQL)
 }

examples/cmd/only_model/generate.go

@@ -1,9 +1,10 @@
 package main
 
 import (
+	"examples/conf"
+	"examples/dal"
+
 	"gorm.io/gen"
-	"gorm.io/gen/examples/conf"
-	"gorm.io/gen/examples/dal"
 )
 
 func init() {