带有simple_form和Mongoid的nil:NilClass的未定义方法`valid_options' [英] undefined method `valid_options' for nil:NilClass with simple_form and Mongoid

问题描述

我有两个模型，类别和发布.

I have two models, Category and Post.

Category.rb

class Category
include Mongoid::Document

field :title, :type => String
has_many :posts, :autosave => true, dependent: :destroy

end

Post.rb

class Post
include Mongoid::Document

field :title, :type => String
belongs_to :category
end

我正在使用 simple_form gem

I'm using simple_form gem

如果我在帖子表中写下一个:

If I write in my post form the next:

<%= simple_form_for(@post) do |f| %>
 <%= f.collection_select :category, Category.all, :id, :title, :prompt => "Choose a Category"%>
 <%= f.input :title %>
 <%= f.button :submit %>
<% end %>

该表格确实可以正常工作:).

The form does works fine :).

但是如果我使用具有simple_form格式的下一个表单:

but if I use the next form with simple_form format:

<%= simple_form_for(@post) do |f| %>
  <%= f.association :category, :prompt => "Choose a Category" %>
  <%= f.input :title %>
  <%= f.button :submit %>
 <% end %>

我遇到下一个错误:

Completed 500 Internal Server Error in 23ms
ActionView::Template::Error (undefined method `valid_options' for nil:NilClass):

如何解决? 谢谢！

How can I fix it? Thank you!

推荐答案

问题已解决.谢谢卡洛斯·安东尼奥·达席尔瓦:D.

The problem was fixed. Thank you to Carlos Antonio da Silva :D.

您可以在 http://groups.google中找到此修复程序. com/group/plataformatec-simpleform/browse_thread/thread/f384f0445af8468e 或:

<%= f.input :category, :collection => Category.all, :prompt => "Choose a Category" %>

谢谢！

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