新規投稿画面で作成を押すと値は入っているのに保存されない

class RoomsController < ApplicationController
  def index
  end

  def new
    @room = Room.new
  end

  def create
    @room = Room.new(room_params)
    if @room.save
      redirect_to root_path
    else
      render :new
    end
  end

  private
  def room_params
    params.require(:room).permit(:name, user_ids:[])
  end
end

div class='chat-room-form'>
  <h1>新規ルーム作成</h1>
  <%=form_with model: @room, local: true do |f|%>

   <%= render "shared/error_messages", model: f.object %>

    <div class='chat-room-form__field'>
      <div class='chat-room-form__field--left'>
        <%= f.label :部署名, class: 'chat-room-form__label'%>
      </div>
      <div class='chat-room-form__field--right'>
        <%= f.text_field :name, class: 'chat__room_name chat-room-form__input', placeholder: '部署名を入力してください'%>
      </div>
    </div>
    <div class='chat-room-form__field'>
    </div>
    <div class='chat-room-form__field'>
      <div class='chat-room-form__field--left'>
        <label class='chat-room-form__label' for='chat_room_チャットメンバー'>部署先</label>
      </div>
      <div class='chat-room-form__field--right'>
       <select name="room[user_ids][]">
         <option value="">チャットする部署を選んで下さい</option>
         <% User.where.not(id: current_user.id).each do |user| %>
         <option value=<%= user.id %>><%= user.name %></option>
         <% end %>
        </select>
        <input name="room[user_ids][]" type="hidden" value=<%= current_user.id %>>
      </div>
    </div>
    <div class='chat-room-form__field'>
      <div class='chat-room-form__field--left'></div>
      <div class='chat-room-form__field--right'>
        <%= f.submit "ルーム作成", class: 'chat-room-form__action-btn'%>
      </div>
    </div>
  <% end %>
</div>

class Room < ApplicationRecord
  has_many :room_users
  has_many :users, through: :room_users
  has_many :messages

  validates :name, presence: true
end

    9: def create
 => 10:   binding.pry
    11:   @room = Room.new(room_params)
    12:   if @room.save
    13:     redirect_to root_path
    14:   else
    15:     render :new
    16:   end
    17: end

[1] pry(#<RoomsController>)> room_params
=> <ActionController::Parameters {"name"=>"テストチャット", "user_ids"=>["5", "3"]} permitted: true>

[2] pry(#<RoomsController>)> exit
  User Load (0.6ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` IN (5, 3)
  ↳ app/controllers/rooms_controller.rb:11:in `create'
  Rendering rooms/new.html.erb within layouts/application
  Rendered shared/_error_messages.html.erb (Duration: 0.3ms | Allocations: 142)
  User Load (0.3ms)  SELECT `users`.* FROM `users` WHERE `users`.`id` != 3
  ↳ app/views/rooms/new.html.erb:24
  Rendered rooms/new.html.erb within layouts/application (Duration: 2.9ms | Allocations: 1480)
[Webpacker] Everything's up-to-date. Nothing to do
Completed 200 OK in 57049ms (Views: 14.0ms | ActiveRecord: 1.3ms | Allocations: 31051)