What is the difference between param with name and no name param on Phoenix

问题

If I write params like (A) and (B) in router.ex.

get "/index/:first/:second", IndexController, :index #(A)
get "/index/:first", IndexController, :index #(B)

which one should be collect (1) or (2)?

conn |>
  redirect(to: index_path(conn, :index, first: first, second: second)) #(1)

conn |>
  redirect(to: index_path(conn, :index, first, second: second)) #(2)

I have no idea of difference to explain.

回答1:

I am not sure I understood the question but off the top of my head, I think, first, after connection and action name, you pass the named params and then, the last argument is the query string params, as far as I remember.

So for

get "/index/:first/:second", IndexController, :index #(A)

it should be

index_path(conn, :index, first, second)

or if you want some query params:

index_path(conn, :index, first, second, _format: "json")

来源：https://stackoverflow.com/questions/48810311/what-is-the-difference-between-param-with-name-and-no-name-param-on-phoenix