Rails控制台重新启动后，父模型找不到关联的子模型对象（然后可以）

Question

我一直在试图弄清楚为什么我的（父）BlogPosts表上的计数器缓存不会从（孩子）评论表。起初我认为我的earlier question中提供的答案可能是解决方案，但昨天晚上睡觉后发生了一些事情，因为当我今天早上醒来并重新启动Rails控制台时，我的BlogPosts（实际上只是一个Post-id＃1）没有无法找到他们相关的孩子评论。我检查了评论表，并且我创建的五条评论都附在post_id = 1上。我的Rails控制台在earlier question中的输出表明该帖子可以在昨晚找到评论。也许这就解释了为什么计数器缓存没有更新，但我仍然不确定父母为什么不能找到它的子女。任何提示？

Loading development environment (Rails 2.3.2) 

>> p = Post.find(1) 
p = Post.find(1) 

=> #<Post id: 1, title: "test", content: "test", author_id: 1, status: "ok", created_at: "2009-05-21 19:27:14", updated_at: "2009-05-24 07:21:24", comments_count: 0> 

>> p.comments.size 
p.comments.size 

=> 0 

>> p.comments 
p.comments 

=> [] 

UPDATE：这很奇怪 - 我再次但是这个时候，我叫p.comments之前我所谓的“p.comments.size”重新启动Rails的控制台 - 它发现了评论！这里发生了什么？

Loading development environment (Rails 2.3.2) 

>> p = Post.find 1 
p = Post.find 1 

=> #<Post id: 1, title: "test", content: "test", author_id: 1, status: "ok", created_at: "2009-05-21 19:27:14", updated_at: "2009-05-24 07:21:24", comments_count: 0> 

>> p.comments 
p.comments 

=> [#<Comment id: 5, post_id: 1, author_id: 1, content: "Fifth Comment", status: "ok", created_at: "2009-05-24 07:08:56", updated_at: "2009-05-24 07:08:56">, #<Comment id: 4, post_id: 1, author_id: 1, content: "Fourth Comment", status: "ok", created_at: "2009-05-24 07:05:32", updated_at: "2009-05-24 07:05:32">, #<Comment id: 3, post_id: 1, author_id: 1, content: "Third Comment", status: "ok", created_at: "2009-05-24 06:34:59", updated_at: "2009-05-24 06:34:59">, #<Comment id: 2, post_id: 1, author_id: 1, content: "Second Comment", status: "ok", created_at: "2009-05-24 05:20:43", updated_at: "2009-05-24 05:20:43">, #<Comment id: 1, post_id: 1, author_id: 1, content: "First Comment", status: "ok", created_at: "2009-05-21 19:27:14", updated_at: "2009-05-21 19:27:14">] 

>> p.comments.size 
p.comments.size 

=> 5 

更新2：遵循srboisvert的建议，我创建了一个新评论并将其添加到帖子。这个工作和comments_counter更新为1：

Loading development environment (Rails 2.3.2) 

>> p = Post.find 1 
p = Post.find 1 

=> #<Post id: 1, title: "test", content: "test", author_id: 1, status: "ok", created_at: "2009-05-21 19:27:14", updated_at: "2009-05-24 07:21:24", comments_count: 0> 

>> com = Comment.new(:post_id => 1, :author_id => 1, :content => 'Sixth Comment', :status => 'ok') 
com = Comment.new(:post_id => 1, :author_id => 1, :content => 'Sixth Comment', :status => 'ok') 

=> #<Comment id: nil, post_id: 1, author_id: 1, content: "Sixth Comment", status: "ok", created_at: nil, updated_at: nil> 

>> p.comments << com 
p.comments << com 

=> [#<Comment id: 6, post_id: 1, author_id: 1, content: "Sixth Comment", status: "ok", created_at: "2009-05-24 17:59:45", updated_at: "2009-05-24 17:59:45">, #<Comment id: 5, post_id: 1, author_id: 1, content: "Fifth Comment", status: "ok", created_at: "2009-05-24 07:08:56", updated_at: "2009-05-24 07:08:56">, #<Comment id: 4, post_id: 1, author_id: 1, content: "Fourth Comment", status: "ok", created_at: "2009-05-24 07:05:32", updated_at: "2009-05-24 07:05:32">, #<Comment id: 3, post_id: 1, author_id: 1, content: "Third Comment", status: "ok", created_at: "2009-05-24 06:34:59", updated_at: "2009-05-24 06:34:59">, #<Comment id: 2, post_id: 1, author_id: 1, content: "Second Comment", status: "ok", created_at: "2009-05-24 05:20:43", updated_at: "2009-05-24 05:20:43">, #<Comment id: 1, post_id: 1, author_id: 1, content: "First Comment", status: "ok", created_at: "2009-05-21 19:27:14", updated_at: "2009-05-21 19:27:14">] 

Answer 1

你可以创建控制台评论，将其添加到职位，然后在3个独立的步骤显示呢？

你正在做很多非默认的fk名称规范（虽然你的名字看起来和rails所期望的不一样，所以你可能只想使用约定），所以我的猜测是你的has_many belongs_to被搞砸了。