form_with non-associated model on another model's view

[fugee ohu]

In my :tour show view I put a form for :press_release and so when the form's submitted there's no prepending of press_release: { to the params hash The form doesn't have any inputs rather field values are passed in parentheses to the route I tried to prepend by adding press_release: { as shown below but it causes a syntax error

    <%= form_with model: @press_release, create_user_tour_press_release_path(press_release: {tour.id: @tour.id, artist_id: @artist.id, poster_type: 'User'}) do |f| %>
I originally had it like this:

    <%= form_with model: @press_release, create_user_tour_press_release_path(tour.id: @tour.id, artist_id: @artist.id, poster_type: 'User') do |f| %>

but that had the problem of no prepended press_release to the params