parsing diff types in json

body, _ := ioutil.ReadAll(resp.Body)
	//create a slice of type Items and unmarshal json to slice
	type inventory struct {
		Type string `json:"type"`
		Data json.RawMessage
	}
	var invData inventory
	if err := json.Unmarshal(body, &invData); err != nil {
		log.Infof("\nError unmarshaling json body for item data: %#v\n", err)
		return nil, err
	}
	var Data model.InventoryData
	switch invData.Type {
	case "ITEM":
		var i model.Item
		if err := json.Unmarshal([]byte(invData.Data), &i); err != nil {
			log.Infof("\nError unmarshaling json body for item data: %#v\n", err)
			Data.Items = append(Data.Items, i)
		}
	case "CATEGORY":
		var c model.Category
		if err := json.Unmarshal([]byte(invData.Data), &c); err != nil {
			log.Infof("\nError unmarshaling json body for item data: %#v\n", err)
			Data.Categories = append(Data.Categories, c)
		}
	case "MODIFIER_LIST":
		var m model.Modifier
		if err := json.Unmarshal([]byte(invData.Data), &m); err != nil {
			log.Infof("\nError unmarshaling json body for item data: %#v\n", err)
			Data.Modifiers = append(Data.Modifiers, m)
		}
	}