如何在Rails中将变量从控制器传递到视图，再传递到控制器？

class UsersController < ApplicationController
  def show
    @user = User.find(params[:id])
  end
end

<h1>User Details</h1>
<p>Name: <%= @user.name %></p>
<p>Email: <%= @user.email %></p>

<%= form_with(model: @user, url: user_path(@user), method: :patch) do |form| %>
  <div class="field">
    <%= form.label :name %>
    <%= form.text_field :name %>
  </div>
  <div class="field">
    <%= form.label :email %>
    <%= form.text_field :email %>
  </div>
  <div class="actions">
    <%= form.submit %>
  </div>
<% end %>

class UsersController < ApplicationController
  def update
    @user = User.find(params[:id])
    if @user.update(user_params)
      redirect_to @user
    else
      render :edit
    end
  end

  private

  def user_params
    params.require(:user).permit(:name, :email)
  end
end