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elixir-plug / plug_cowboy

Plug adapter for the Cowboy web server
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Key-Value notation in query parameters where value is a list #97

Closed bpajk closed 7 months ago

bpajk commented 7 months ago

Hello, I am trying to send a list of values in query parameters using the key-value notation, but I am not getting the expected results.

Key-Value We can pass query parameters as key-value pairs like this: ?obj[eq]=val

Fetched query parameters for this request would be: %{ "obj" => %{"eq" => "val"} }

List of value Similarly we can pass a list using the array notation: ?arr[]=val1&arr[]=val2

This would yield: %{ "arr" => ["val1", "val2"] }

Key-Value where value is a list But if we try passing a list of key-value pairs we only get the last value ?obj_arr[in]=val1&obj_arr[in]=val2

This yields: %{ "obj_arr" => %{"in" => "val2"} }

Expected result It would be nice, if the request above would result in: %{ "obj_arr" => %{"in" =>[ "val1", "val2"]} }

I am using: Erlang/OTP 26 Elixir 1.16.0 plug_cowboy 2.7.0

Gazler commented 7 months ago

I believe this is related https://github.com/elixir-plug/plug/issues/1210

bpajk commented 7 months ago

I have checked the https://github.com/elixir-plug/plug/issues/1210 which helped to solve this issue.

Looks like I can achieve what I want by writing the query like so: ?obj_arr[in][]=val1&obj_arr[in][]=val2

this results in: %{"obj_arr" => %{"in" => ["val1", "val2"]}}

Thank you!