我已经搜索了之前的问题，有几个和我的问题相似--但是他们的解决方案对我不起作用。我的应用程序在本地运行良好，但是当我试图创建评论时（作为一个用户，我正在使用design），在Heroku上就不行了。我会尽可能多地给予细节。
出现以下错误：

We're sorry, but something went wrong.
If you are the application owner check the logs for more information.

那我就做了
大鹿原木--尾部
我看到了这个

2021-05-26T14:34:26.408158+00:00 app[web.1]: I, [2021-05-26T14:34:26.408029 #4]  INFO -- : [0aa9a88d-47f4-42b9-a93a-658d40d61fff] Started POST "/projects/1/comments" for 103.85.38.191 at 2021-05-26 14:34:26 +0000
2021-05-26T14:34:26.409593+00:00 app[web.1]: I, [2021-05-26T14:34:26.409489 #4]  INFO -- : [0aa9a88d-47f4-42b9-a93a-658d40d61fff] Processing by CommentsController#create as HTML
2021-05-26T14:34:26.413951+00:00 app[web.1]: I, [2021-05-26T14:34:26.413812 #4]  INFO -- : [0aa9a88d-47f4-42b9-a93a-658d40d61fff]   Parameters: {"authenticity_token"=>"[FILTERED]", "comment"=>{"body"=>"hey"}, "commit"=>"Create Comment", "project_id"=>"1"}
2021-05-26T14:34:26.435342+00:00 app[web.1]: I, [2021-05-26T14:34:26.435230 #4]  INFO -- : [0aa9a88d-47f4-42b9-a93a-658d40d61fff] Completed 500 Internal Server Error in 21ms (ActiveRecord: 4.0ms | Allocations: 1086)
2021-05-26T14:34:26.436572+00:00 app[web.1]: F, [2021-05-26T14:34:26.436494 #4] FATAL -- : [0aa9a88d-47f4-42b9-a93a-658d40d61fff]
2021-05-26T14:34:26.436575+00:00 app[web.1]: [0aa9a88d-47f4-42b9-a93a-658d40d61fff] ActiveModel::MissingAttributeError (can't write unknown attribute `user_id`):
2021-05-26T14:34:26.436576+00:00 app[web.1]: [0aa9a88d-47f4-42b9-a93a-658d40d61fff]
2021-05-26T14:34:26.436576+00:00 app[web.1]: [0aa9a88d-47f4-42b9-a93a-658d40d61fff] app/controllers/comments_controller.rb:5:in `create'

所以我尝试了其他问题推荐的类似问题，我做到了
heroku rails/rake数据库迁移
Heroku再起动
heroku pg：重置数据库
它们都不起作用，或对错误没有任何影响。
以下是错误所引用的代码块（位于CommentsController中），以供参考。

class CommentsController < ApplicationController
    def create
        @project = Project.find(params[:project_id])
        @comment = @project.comments.create(comment_params)
        @comment.user = current_user
        @comment.save
        redirect_to project_path(@project)
    end
    private
    def comment_params
        params.require(:comment).permit(:user_id, :body)
    end
end