创建记录时出错：nil 对象而不是数组？
我有一个包含许多帖子的主题，并接受它们的嵌套属性。当我创建主题时，它也会创建第一篇文章。
当调用 Topics#create 时，我在尝试评估 nil.[]= 时收到 NoMethodError ，并且我只是不知道是什么造成它。
创建方法：
@forum = Forum.find params[:forum_id]
params[:topic][:post_attributes][:member_id] = current_member.id
@topic = @forum.topics.create params[:topic]
respond_with @topic, location: topic_url(@topic)
我的新主题形式：
- @topic.posts.build
= form_for @topic do |topic_form|
= topic_form.label :title
= topic_form.text_field :title
= topic_form.fields_for :posts do |post_fields|
= post_fields.label :content
= post_fields.text_area :content
知道哪里出了问题吗？
I have a Topic that has many Posts, and accepts nested attributes for them. When I create a topic it creates a first post as well.
When Topics#create is called I get a NoMethodError when trying to evaluate nil.[]=, and I just can't figure out what's causing it.
The create method:
@forum = Forum.find params[:forum_id]
params[:topic][:post_attributes][:member_id] = current_member.id
@topic = @forum.topics.create params[:topic]
respond_with @topic, location: topic_url(@topic)
My new topic form:
- @topic.posts.build
= form_for @topic do |topic_form|
= topic_form.label :title
= topic_form.text_field :title
= topic_form.fields_for :posts do |post_fields|
= post_fields.label :content
= post_fields.text_area :content
Any idea on what is wrong?
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我的猜测是，它在这一行：
您可能应该将其更新为：
或
因为您使用的是 has_many 关联，所以可能会随该主题提交多个帖子，因此 post_attributes 的参数实际上是一个大批。
My guess is that it is on this line:
You should probably update it to:
or
Because you are using a has_many association there is a potential for more than one post to be submitted with the topic, therefore the params for the post_attributes are actually an array.
它与邮政有很多关联吗？
也许你应该尝试：
Is it a has many association for Post ?
Maybe you should try with :