在我的控制器中,我有这个方法,向我返回特定书籍控制器/ books_controller的列表
def postings
@books = Book.postings(current_user.id).order("created_at ASC")
render :partial =>'postings'
end
我在views / books / _postings.html.erb
中有部分内容<div class="container">
<h4>My Partial Postings</h4>
<% @books.each do |book| %>
<div class="row">
<div class="col-sm-2"><img src="<%= book.image_path %>" alt="..." class="img-responsive"/></div>
<div class="col-sm-10">
<h4 class="nomargin"><%= book.title %></h4>
<p><%= book.description %></p>
<p>Quantity: <%= book.quantity %></p>
<p>Available for: <%= book.sale_type %></p>
</div>
</div>
<hr>
<% end %>
</div>
在我的路线中:
resources :books do
collection do
get 'postings'
end
end
运行rake路线:
postings_books GET /books/postings(.:format) books#postings
当我使用localhost:3000 / books / postss时,我得到了所需的部分书籍列表。但是当我想从其他视图中调用此部分时,例如来自localhost:3000 / dashboard / index:
<div class="tab-pane" id="postings">
<%= render 'books/postings', :collection => @books %>
</div>
我收到以下错误:
Showing /home/swati/867/WorkSpace2/assignment_3/app/views/books/_postings.html.erb where line #4 raised:
undefined method `each' for nil:NilClass
Extracted source (around line #4):
<div class="container">
<h4>My Partial Postings</h4>
<% @books.each do |book| %>
<div class="row">
<div class="col-sm-2"><img src="<%= book.image_path %>" alt="..." class="img-responsive"/></div>
<div class="col-sm-10">
我知道渲染只是渲染局部而不调用books_controller中的方法贴子而我的局部无法访问@books,这是零。如何解决这个问题呢?
答案 0 :(得分:0)
当您访问dashboard/index
时,您实际上正在调用index
dashboards_controller
方法。如果您想在那里呈现books/postings
部分,则需要在该控制器中添加书籍列表(@books
)。
此处有更多信息:http://guides.rubyonrails.org/action_controller_overview.html