Feature mongo gen (#546)

* add feature: mongo code generation

* upgrade version

* update doc

* format code

* update update.tpl of mysql

tools/goctl/model/mongo/generate/generate_test.go

@@ -0,0 +1,34 @@
+package generate
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tal-tech/go-zero/tools/goctl/config"
+)
+
+var testTypes = `
+	type User struct{}
+	type Class struct{}
+`
+
+func TestDo(t *testing.T) {
+	cfg, err := config.NewConfig(config.DefaultFormat)
+	assert.Nil(t, err)
+
+	tempDir := t.TempDir()
+	typesfile := filepath.Join(tempDir, "types.go")
+	err = ioutil.WriteFile(typesfile, []byte(testTypes), 0666)
+	assert.Nil(t, err)
+
+	err = Do(&Context{
+		Types:  []string{"User", "Class"},
+		Cache:  false,
+		Output: tempDir,
+		Cfg:    cfg,
+	})
+
+	assert.Nil(t, err)
+}