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.go

@@ -0,0 +1,69 @@
+package generate
+
+import (
+	"errors"
+	"path/filepath"
+
+	"github.com/tal-tech/go-zero/tools/goctl/config"
+	"github.com/tal-tech/go-zero/tools/goctl/model/mongo/template"
+	"github.com/tal-tech/go-zero/tools/goctl/util"
+	"github.com/tal-tech/go-zero/tools/goctl/util/format"
+)
+
+// Context defines the model generation data what they needs
+type Context struct {
+	Types  []string
+	Cache  bool
+	Output string
+	Cfg    *config.Config
+}
+
+// Do executes model template and output the result into the specified file path
+func Do(ctx *Context) error {
+	if ctx.Cfg == nil {
+		return errors.New("missing config")
+	}
+
+	err := generateModel(ctx)
+	if err != nil {
+		return err
+	}
+
+	return generateError(ctx)
+}
+
+func generateModel(ctx *Context) error {
+	for _, t := range ctx.Types {
+		fn, err := format.FileNamingFormat(ctx.Cfg.NamingFormat, t+"_model")
+		if err != nil {
+			return err
+		}
+
+		text, err := util.LoadTemplate(category, modelTemplateFile, template.Text)
+		if err != nil {
+			return err
+		}
+
+		output := filepath.Join(ctx.Output, fn+".go")
+		err = util.With("model").Parse(text).GoFmt(true).SaveTo(map[string]interface{}{
+			"Type":  t,
+			"Cache": ctx.Cache,
+		}, output, false)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func generateError(ctx *Context) error {
+	text, err := util.LoadTemplate(category, errTemplateFile, template.Error)
+	if err != nil {
+		return err
+	}
+
+	output := filepath.Join(ctx.Output, "error.go")
+
+	return util.With("error").Parse(text).GoFmt(true).SaveTo(ctx, output, false)
+}