tl;dr: Add empty brackets ([]
) after students
to the input names.
Fiddling with Rack::Utils.parse_nested_query it seems you can get the payload you want like this:
<!-- first student -->
<input type="text" name="students[][first]">
<input type="text" name="students[][last]">
<input type="text" name="students[][age]">
<!-- second student -->
<input type="text" name="students[][first]">
<input type="text" name="students[][last]">
<input type="text" name="students[][age]">
Note the empty brackets ([]
) after students
. This tells Rack you want the students
param to be an array. Subsequent params encountered (with the same name) will start a new element.
POST /myroute?students[][first]=foo&students[][last]=bar&students[][age]=21&students[][first]=baz&students[][last]=qux&students[][age]=19
Gets parsed like this:
{"students" => [
{
"first" => "foo",
"last" => "bar",
"age" => "21"
},
{
"first" => "baz",
"last" => "qux",
"age" => "19"
}
]}
Further reading: http://codefol.io/posts/How-Does-Rack-Parse-Query-Params-With-parse-nested-query