How to get an array of parameter values in gin

Question

I need to accept multiple cat_id values in the request, for example:

localhost:8080/products/?cat_id=1,2

My func:

func GenerateMultiParams(c *gin.Context) models.Params {
    limit := 0
    page := 1
    cat_id := 1
    query := c.Request.URL.Query()
    for key, value := range query {
        queryValue := value[len(value)-1]
        switch key {
        case "limit":
            limit, _ = strconv.Atoi(queryValue)
        case "page":
            page, _ = strconv.Atoi(queryValue)
        case "cat_id":
            cat_id, _ = strconv.Atoi(queryValue)
        }
    }
    return models.Params{
        Limit:  limit,
        Page:   page,
        Cat_id: []cat_id,
    }
}

My struct:

type Params struct {
    Limit  int   `json:"limit"`
    Page   int   `json:"page"`
    Cat_id []int `json:"cat_id"`
}

Request in my function:

result := config.DB.Model(&models.Products{}).Where(q).Where("cat_id=?", pagination.Cat_id).Limit(pagination.Limit).Offset(offset).Find(&prod)

I looked at many articles on the Internet, but not a single piece of advice helped me.

?cat_id=1&cat_id=2 is the standard way to specify multiple values for a query parameter. Then you can do r.URL.Query()["cat_id"], this will return a []string which will contain two elements: "1" and "2". — mkopriva
– mkopriva, Commented Jul 24, 2022 at 12:52

LeGEC · Accepted Answer · 2022-07-24 12:51:03Z

3

queryValue is a string, you can apply whatever action you see fit on it :

func toIntArray(str string) []int {
    chunks := strings.Split(str, ",")

    var res []int
    for _, c := range chunks {
        i, _ := strconv.Atoi(c) // error handling ommitted for concision
        res = append(res, i)
    }

    return res
}

I don't know if Gin has a built in function to do something like the above

answered Jul 24, 2022 at 12:51

LeGEC

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1 Comment

max0l Aug 7 at 21:35

gin does not support it, as of this GitHub issue, which suggests the same: github.com/gin-gonic/gin/issues/1516

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