code: func (c *LabelController) Show(ctx *app.ShowLabelContext) error {
  	var lbl *label.Label
  	err := application.Transactional(c.db, func(appl application.Application) error {
  		var err error
  		lbl, err = appl.Labels().Load(ctx, ctx.LabelID)
  		return err
  	})
  	if err != nil {
  		return jsonapi.JSONErrorResponse(ctx, err)
  	}
  	return ctx.OK(&app.LabelSingle{
  		Data: ConvertLabel(ctx.Request, *lbl),
  	})
  }
docs: // Show retrieve a single label