How to parse form array in golang Beego - html

Question

How to parse html form array with Beego.
<input name="names[]" type="text" />
<input name="names[]" type="text" />
<input name="names[]" type="text" />
Go Beego
type Rsvp struct {
Id int `form:"-"`
Names []string `form:"names[]"`
}
rsvp := Rsvp{}
if err := this.ParseForm(&rsvp); err != nil {
//handle error
}
input := this.Input()
fmt.Printf("%+v\n", input) // map[names[]:[name1 name2 name3]]
fmt.Printf("%+v\n", rsvp) // {Names:[]}
Why Beego ParseForm method return an empty names?
How to get values into rsvp.Names?

Answer 1

Thanks #ysqi for giving me a hint. I am adding a little detailed example to parse associate array like form data in beego
Here is my form structure:
<input name="contacts[0][email]" type="text" value="a1#gmail.com"/>
<input name="contacts[0][first_name]" type="text" value="f1"/>
<input name="contacts[0][last_name]" type="text" value="l1"/>
<input name="contacts[1][email]" type="text" value="a2#gmail.com"/>
<input name="contacts[1][first_name]" type="text" value="f2"/>
<input name="contacts[1][last_name]" type="text" value="l2"/>
golang(beego) code:
contacts := make([]map[string]string, 0, 3)
this.Ctx.Input.Bind(&contacts, "contacts")
contacts variable:
[
{
"email": "user2#gmail.com",
"first_name": "Sam",
"last_name": "Gamge"
},
{
"email": "user3#gmail.com",
"first_name": "john",
"last_name": "doe"
}
]
Now you can use it like:
for _, contact := range contacts {
contact["email"]
contact["first_name"]
contact["last_name"]
}

Answer 2

As you can see from the implementation of the FormValue method of the Request, it returns the first value in case of multiple ones:
http://golang.org/src/pkg/net/http/request.go?s=23078:23124#L795
It would be better to get the attribute itself r.Form[key] and iterate over all the results manually. I am not sure how Beego works, but just using the raw
Request.ParseForm and Request.Form or Request.PostForm maps should do the job.
http://golang.org/src/pkg/net/http/request.go?s=1939:6442#L61

Answer 3

You can do like this : see doc
v := make([]string, 0, 3)
this.Ctx.Input.Bind(&v, "names")