Rails: Routing and form for custom controller method - ruby-on-rails

Question

I'm getting this error attempting to create a page that shows room details. Pressing on edit will triggger a popup window with prefilled values of the room clicked. And clicking save on the window will update data for that entry.
I'm not so sure how to predefine the id, I'm currently using jQuery to populate the form with current data of selected records.
No route matches {:action=>"save_details", :controller=>"rooms"}, missing required keys: [:id]
rooms/index.html.erb
<%= form_for(#room, url: save_details_room_path) do |f| %>
<% f.text_field :id, id:'edit-room-id', class:'d-none' %>
<% f.text_field :name, id:'edit-room-name' %>
<% f.text_area :desc, id:'edit-room-desc', style:'width: 90%; height: 8em; resize: none; float: bottom' %>
<%= f.submit 'Save', :class=>'btn btn-primary' %>
<% end %>
rooms_controller.rb
def save_details
logger.info ('Hello world')
#room= Room.find(params[:id])
#room.name = params[:name]
#room.description = params[:desc]
#room.save
redirect_to rooms_url
end
def show
#room = Room.find(prams[:id])
end
def index
#room = Room.all
end
routes.rb
resources :rooms do
get :save_details, on: :member
end
main.js
const name = $(this).data('name');
const desc = $(this).data('description');
const id = $(this).data('id');
$('#edit-room-id').val(id);
$('#edit-room-name').val(name);
$('#edit-room-desc').val(desc);
1ST EDIT:
Now I'm doing this another way which is just to simply pass the form as a url through, eg. /rooms/save_details?id=1,name=123,desc=1234. However the form just simply routes it into the default show/index methods in my controller. Anyway to route it directly to save_details method? Doing the below simply returns the error that says save_details does not exist as an id. Also editted my routes
new routes.rb
get '/rooms/save_details/:id/:name/:desc' => 'rooms#save_details', :as => 'save_details'
index.html.erb
<form action="rooms/save_details" method="get">
....
</form>

Answer 1

Looks like you're trying to save a form, this probably shouldn't be a get
resources :rooms do
post :save_details, on: :member
end

Answer 2

You're missing the :id parameter on your route helper. You need to do:
<%= form_for(#room, url: save_details_room_path(id: #room.id)) do |f| %>
And as Asthmatic suggested, that will have to be a :post route if a form is being submitted to it.
It appears you're using jQuery to fill in the room id, so you may have to skip the Rails form helper in favor of a plain HTML form. In that case you'll have to build and add the action attribute after you have the room id.

Answer 3

Finally solved it by using a normal HTML form and adding the following in routes.rb
get '/rooms/save_details/:id/:name/:desc' => 'rooms#save_details', :as => 'save_details'
resources :rooms do
get 'save_details', on: :collection
end