Heroku Rails NoMethodError

Question

我的应用在本地运行完美，但在Heroku上遇到了一些问题。

heroku日志

2016-07-05T16:29:58.946783+00:00 app[web.1]: Started GET "/posts/new" for 110.30.34.50 at 2016-07-05 16:29:58 +0000
2016-07-05T16:29:58.955329+00:00 app[web.1]:   Rendered posts/_form.html.erb (2.4ms)
2016-07-05T16:29:58.955545+00:00 app[web.1]:   Rendered posts/new.html.erb within layouts/application (3.4ms)
2016-07-05T16:30:05.508001+00:00 app[web.1]: Started POST "/posts" for 110.30.34.50 at 2016-07-05 16:30:05 +0000
2016-07-05T16:30:05.510085+00:00 app[web.1]:   Parameters: {"utf8"=>"✓", "authenticity_token"=>"0DzbuSXUyjZ4FRYietP3QSdmjfHymWyu7INcGpm79b2PgR+3LD99TS6gkYCF0FCLLHso9U7YqMh1tzr48ch8Jw==", "post"=>{"title"=>"123", "content"=>"123"}, "commit"=>"Create Post"}
2016-07-05T16:30:05.515017+00:00 app[web.1]:   app/controllers/posts_controller.rb:32:in `create'
2016-07-05T16:30:05.512757+00:00 app[web.1]:   Author Load (1.2ms)  SELECT  "authors".* FROM "authors" WHERE "authors"."id" = $1  ORDER BY "authors"."id" ASC LIMIT 1  [["id", 1]]
2016-07-05T16:30:05.513954+00:00 app[web.1]: Completed 500 Internal Server Error in 4ms (ActiveRecord: 1.2ms)
2016-07-05T16:30:05.515003+00:00 app[web.1]: 
2016-07-05T16:30:05.515016+00:00 app[web.1]: NoMethodError (undefined method `author_id=' for #<Post:0x007fcf1cc579f0>):
2016-07-05T16:30:05.509973+00:00 app[web.1]: Processing by PostsController#create as HTML
2016-07-05T16:30:05.515018+00:00 app[web.1]: 
2016-07-05T16:30:05.515019+00:00 app[web.1]: 

我想创建post并给出author_id = current_author.id。

#in post controller

def create
    @post = Post.new(post_params)
    @post.author_id = current_author.id if current_author
    ...

我已将此项目放在Github

上

Answer 1

我认为您最近添加了作者对posts表的引用。为了解决这个错误，我说你应该尝试heroku run rake db:migrate。如果有帮助，请告诉我

Answer 2

在heroku上迁移db

heroku run rake db：migrate

Answer 3

正如其他人指出可能的解决方案。但要确保，

运行heroku run rake db:version，看看它是否与db/migrate/*

中的最新迁移版本相匹配

如果没有运行heroku run rake db:migrate as oreoluwa和lolosco已经说过了。