我正在尝试在我的评论控制器中编写我的删除方法。我的评论模型与其他模型有多态关联,但在这种情况下,我们只关注旅行。换句话说,@ trip = @commentable。
评论被删除就好了,但是当我重定向到@commentable时,我会不断收到错误ActionController::ActionControllerError in CommentsController#destroy: Cannot redirect to nil!
,这将是评论所属的行程。
我还在我的创建操作(注释控制器)中重定向到@commentable,并且在用户创建新注释时工作正常。
任何提示?
查看(trips / show.html.erb)
<% if !@commentable.comments.empty? %>
<% @commentable.comments.each do |comment| %>
<!-- Content -->
<%= link_to comment, :method => :delete do %> delete <% end %>
<% end %>
<% end %>
适用于创建操作的评论表单
<%= form_for [@commentable, Comment.new] do |f| %>
<%= f.text_area :content %>
<div id="comment_submit_button"><%= f.submit "Comment" %></div>
<% end %>
trips_controller.rb
def show
@trip = @commentable = Trip.find(params[:id])
@comments = Comment.all
end
comments_controller.rb
def create
@commentable = find_commentable
@comment = @commentable.comments.build(params[:comment])
@comment.user_id = current_user.id
if @comment.save
redirect_to @commentable
end
end
def destroy
# @commentable = find_commentable this line was wrong
@comment = Comment.find(params[:id])
@commentable = @comment.commentable #this line fixed it
if @comment.destroy
redirect_to @commentable
end
end
def find_commentable
params.each do |name, value|
if name =~ /(.+)_id$/
return $1.classify.constantize.find(value)
end
end
nil
end
答案 0 :(得分:4)
找出解决方案。将在上面的代码中发布解决方案。
def destroy
@comment = Comment.find(params[:id])
@commentable = @comment.commentable
if @comment.destroy
redirect_to @commentable
end
end