如何將paperclip啓用爲acts_as_commentable_with_threading？

Question

我已經設置了回形針，並且它與我自己創建的模型正常工作。
我試着用模型做同樣的事情，這個模型是由gem創建的，叫做acts_as_commentable_with_threading 但是它永遠不會保存存儲圖片的file_name。但它照常保存評論。
這真的很奇怪，它只是不會採取回形針文件上傳。

爲什麼？

型號/ comment.rb（當然，我已遷移需要評語表列）的意見/用戶/ show.html.erb

attr_accessible :comment_icon 

has_attached_file :comment_icon, 
    :styles => { 
    :thumb=> "100x100>", 
    :small => "400x400>" } 

<%= render 'comment', :user => @user %> 

views/users/_comment.html.erb

<%=form_for :users, url: url_for(:controller => :users, :action => :add_comment) do |f| %> 

    <div class="field"> 
     <%= f.label :body %><br /> 
     <%= f.text_field :body %> 
    </div> 
    <div class="field"> 
    <%= f.file_field :comment_icon %> 
    </div> 
    <div class="actions"> 
    <%= f.submit %> 
    </div> 

<% end %> 

UPDATE：

users_controller.rb

def add_comment 
    @user = User.find_by_username(params[:id]) 
    @user_who_commented = current_user 
    @comment = Comment.build_from(@user, @user_who_commented.id, params[:users][:body]) 
    @comment.save 
    redirect_to :controller => 'users', :action => 'show', :id => @user.username 
    flash[:notice] = "comment added!" 
end 




def delete_comment 
    @comment = Comment.find(params[:id]) 

    if current_user.id == @comment.user_id 
     @comment.destroy 
     flash[:notice] = "Deleted!" 
    else 
     flash[:notice] = "Sorry, you can't delete this comment" 
    end 
    redirect_to :controller => 'users', :action => 'show', :id => params[:username] 
end 

模型/ comment.rb（由acts_as_commentable_with_threading自動創建的）

這是Comment模型的一部分。在我的用戶操作中添加評論時，這很重要嗎？

# Helper class method that allows you to build a comment 
    # by passing a commentable object, a user_id, and comment text 
    # example in readme 
    def self.build_from(obj, user_id, comment) 
    c = self.new 
    c.commentable_id = obj.id 
    c.commentable_type = obj.class.base_class.name 
    c.body = comment 
    c.user_id = user_id 
    c 
    end 

Answer 1

嘗試add_comment行動加入@comment.save之前這一行：

@comment.comment_icon = params[:users][:comment_icon]