param is missing or the value is empty: room - ruby-on-rails

Question

i created an edit page to edit the room(model) and update the form to change the current name and current capacity to whatever we wish but i am getting an error
ActionController::ParameterMissing in RoomsController#edit
param is missing or the value is empty: room
rooms_controller.rb
class RoomsController < ApplicationController
before_action :set_room, only: %i[show edit update]
def index
#rooms = Room.all
end
def show
end
def new
#room = Room.new
end
def create
#room = Room.new(room_params)
respond_to do |format|
if #room.save
format.html { redirect_to room_url(#room), notice: "Room was created Successfully" }
else
format.html { render :new, status: :unprocessable_entity }
end
end
end
def edit
respond_to do |format|
if #room.update(room_params)
format.html { redirect_to room_url(#room), notice: "Room was successfully updated!" }
else
format.html { render :edit, status: :unprocessable_entity }
end
end
end
private
def set_room
#room = Room.find(params[:id])
end
def room_params
params.require(:room).permit(:name, :capacity)
end
end
edit.hml.erb
<h2>Edit Room</h2>
<%= render "form", room: #room %>
_form.html.erb
<%= form_with(model: room) do |form| %>
<% if room.errors.any? %>
<div style="color: red">
<h2><%= pluralize(room.errors.count, "errors") %> Prohibited this Room from saving</h2>
<ul>
<% room.errors.each do |error| %>
<li><%= error.full_message %></li>
<% end %>
</ul>
</div>
<% end %>
<div>
<%= form.label :name, style: "display: block" %>
<%= form.text_field :name %>
</div>
<div>
<%= form.label :capacity, style: "display: block" %>
<%= form.number_field :capacity %>
</div>
<div>
<%= form.submit %>
</div>
<% end %>
i am using the same partial _form.html.erb for both new.html.erb and edit.html.erb , is it because of using same partial form for edit and new or there is some other reason?
new.html.erb
<h1>New Room</h1>
<%= render "form", room: #room %>

Answer 1

You're using the wrong action.
In Rails flavored REST the edit action responds to a GET /rooms/:id/edit request and just renders the form. It should also be idempotent. There is no room parameter since you're not responding to a form submission.
Updating the resource is done in the update method (PATCH /rooms/:id).
class RoomsController < ApplicationController
# ...
# you can actually completely omit this method
# Rails will implicitly render edit.html.erb anyways
# GET /rooms/1/edit
def edit
end
# PATCH /rooms/1
def update
# you don't need to use MimeResponds if you're only responding to HTML requests. KISS
if #room.update(room_params)
redirect_to #room, notice: "Room was successfully updated!"
else
render :edit, status: :unprocessable_entity
end
end
# ...
end