如何將參數從form_for傳遞到其他控制器？

Question

我有一個問題模型和一個評論模型。在問題＃show view中，我有一個評論表單。我在問題＃show controller動作中爲表單創建了@comment，然後將它傳遞給註釋＃create controller action以實際創建並將註釋保存到數據庫。但是，一旦@comment參數傳遞給comment＃create動作，我不再擁有需要的issue_id信息。我將如何傳遞這些信息？下面是我的文件：

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

問題控制器：

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 

和評論控制器：

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

Answer 1

你只需要修改你的show行動

創建 @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 

現在，當您呈現形式@comment的issue_id應該是存在於隱藏的表單輸入

---

這無關你的問題，但我也注意到你正在加載@current_user_vote

方式

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

你或許應該這樣做，因爲：

@current_user_vote = current_user.votes.first 

Answer 2

如果我沒理解好，一n問題可能有很多評論和評論屬於一個問題？

# 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 

問題＃顯示有點奇怪。

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