create 方法不适用于推文 - 包含错误“无法找到没有 ID 的用户”

class TweetsController < ApplicationController
  before_action :authenticate_user!, :except => [:index, :new, :create]

   def index
    @tweets = Tweet.all.order("created_at DESC")
    @tweet = Tweet.new
  end

  def show
    @tweet = Tweet.find(params[:id])
  end

  def new
    # @tweet = Tweet.new
  end

  def create
    @user = User.find(params[:id])
    @tweet = Tweet.new(tweet_params)
    @tweet.user = @user
    if @tweet.save
    redirect_to tweets_path
  end
  end

  def edit
    @tweet = Tweet.find(params[:id])
  end

  def update
    @tweet = Tweet.find(params[:id])
    @tweet.update(tweet_params)
    redirect_to tweets_path
  end

  private
  def tweet_params
    params.require(:tweet).permit(:user_id,:content)
  end
end

<h1>TWEETS</h1>

<%= simple_form_for [@user,@tweet], id: "form-submit" do |f| %>
   <%= f.input :content, label: "Tweet" %>
   <%= f.input :user %>
   <%= f.button :submit, class: "btn btn-danger" %>
   <% end %>

   <br>

<% @tweets.each do |tweet|  %>
  <ul>
    <li>
      <%= tweet.created_at.strftime("%B %d %Y, %l:%M%P") %> <br>
      <%= tweet.content %>
      <%= tweet.user.username %>

    </li>
  </ul>
<% end %>