What is the idiomatic way of getting an integer value from query string in Echo?

Question

I have an integer query param "page", that defaults to 1. I can get it from Echo context like this:

var page int
pageString := c.QueryParam("page")
if pageString == "" {
    page = 1
} else {
    var err error
    page, err = strconv.Atoi(pageString)

    if err != nil {
        page = 1
    }
}

While this works, I would kind of prefer to do something like page := c.QueryParamInt("page", 1) but I couldn't find any equivalent in Echo docs. Should I just write my own utility function or is there a better way?

You could do something like this: https://play.golang.com/p/fu66E8wMtfX but other than that, you'll have to write your own utility functions. — mkopriva, Jan 16 '20 at 11:00

score 3 · Answer 1 · answered Jan 16 '20 at 12:05

3

You can try something like:

qp := c.QueryParam("page")
page, err := strconv.Atoi(qp)
if err != nil {
        page=1
}

You don't have to write that much ifelse. Hope this helps.

answered Jan 16 '20 at 12:05

Prakash Kumar

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score 1 · Answer 2 · answered Jan 16 '20 at 12:13

If you plan on parsing many integer params then the best thing would be to write your own utility function:

func QueryParamInt(c echo.Context, name string, default int) int {
  param := c.QueryParam(name)
  result, err := strconv.Atoi(param)
  if err != nil {
    return default
  }
  return result
}

Then use it as you would like.
Other options would be to extend the echo context, more on that here.

What is the idiomatic way of getting an integer value from query string in Echo?

2 Answers2