fix golint issues (#561)

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

@@ -19,18 +19,22 @@ var templates = map[string]string{
 	errTemplateFile:   template.Error,
 }
 
+// Category returns the mongo category.
 func Category() string {
 	return category
 }
 
+// Clean cleans the mongo templates.
 func Clean() error {
 	return util.Clean(category)
 }
 
+// Templates initializes the mongo templates.
 func Templates(_ *cli.Context) error {
 	return util.InitTemplates(category, templates)
 }
 
+// RevertTemplate reverts the given template.
 func RevertTemplate(name string) error {
 	content, ok := templates[name]
 	if !ok {
@@ -40,6 +44,7 @@ func RevertTemplate(name string) error {
 	return util.CreateTemplate(category, name, content)
 }
 
+// Update cleans and updates the templates.
 func Update() error {
 	err := Clean()
 	if err != nil {

tools/goctl/model/mongo/mongo.go

@@ -10,7 +10,7 @@ import (
 	"github.com/urfave/cli"
 )
 
-// Command provides the entry for goctl
+// Action provides the entry for goctl mongo code generation.
 func Action(ctx *cli.Context) error {
 	tp := ctx.StringSlice("type")
 	c := ctx.Bool("cache")

tools/goctl/model/mongo/template/template.go

@@ -101,6 +101,7 @@ func (m *default{{.Type}}Model) Delete(ctx context.Context, id string) error {
 }
 `
 
+// Error provides the default template for error definition in mongo code generation.
 var Error = `
 package model