如何将参数从form_for传递到其他控制器？

Question

我有一个问题模型和一个评论模型。在问题＃show view中，我有一个评论表单。我在问题＃show controller动作中为表单创建了@comment，然后将它传递给注释＃create controller action以实际创建并将注释保存到数据库。但是，一旦@comment参数传递给comment＃create动作，我不再拥有需要的issue_id信息。我将如何传递这些信息？下面是我的文件：

<%= form_for @comment do |f| %> 
    <%= render 'comment_fields', :f => f %> 
    <%= f.submit "Submit" %> 
<% end %> 

问题控制器：

def show 
    @issue = Issue.find(params[:id]) 
    @votes = Votership.where(:issue_id => @issue.id) 
    @current_user_vote = @votes.where(:user_id => current_user.id).first 
    @comment = Comment.new 
    end 

和评论控制器：

def create 
    @comment = Comment.new(params[:comment]) 
    @comment.save 
    redirect_to :back 
    end 

Answer 1

你只需要修改你的show行动

创建 @comment方式

def show 
    @issue = Issue.find(params[:id]) 
    @votes = Votership.where(:issue_id => @issue.id) 
    @current_user_vote = @votes.where(:user_id => current_user.id).first 
    @comment = @issue.comments.build # assigns issue_id to comment 
end 

现在，当您呈现形式@comment的issue_id应该是存在于隐藏的表单输入

---

这无关你的问题，但我也注意到你正在加载@current_user_vote

方式

@current_user_vote = @votes.where(:user_id => current_user.id).first 

你或许应该这样做，因为：

@current_user_vote = current_user.votes.first 

Answer 2

如果我没理解好，一n问题可能有很多评论和评论属于一个问题？

# config/routes.rb 
# Nest the comment under the issue 
resources :issues do 
    resources :comments, only[:create] 
end 

# app/models/issue.rb 
has_many :comments 

# app/models/comment.rb 
belongs_to :issue 

# app/controllers/issues_controller.rb 
def show 
    @issue = Issue.find params[:id] 
    ... 
end 

# app/views/issues/show.html.erb 
<%= form_for [@issue, @issue.comments.build] do |f| %> 
.... 
<% end %> 

# app/controllers/comments_controller.rb 
def create 
    @issue = Issue.find params[:issue_id] 
    @comment = @issue.comments.build params[:comment] 
    if @comment.save 
    redirect_to @issue 
    else 
    render 'issues/show' # => it will know which issue you are talking about, don't worry 
    end 
end 

# or if you don't need validation on comment: 
def create 
    @issue = Issue.find params[:issue_id] 
    @issue.comments.create params[:comment] 
    redirect_to @issue 
end 

问题＃显示有点奇怪。

def show 
    @issue = Issue.find params[:id] 
    @votes = @issue.voterships 
    @current_user_vote = current_user.votes.first 
    # maybe you want to list all the comments: @comments = @issue.comments 
end