Question

以下是控制器

    class CommentsController < InheritedResources::Base
    def comment_params
        params.require(:comment).permit(:name, :email, :body, :post_id)
    end

    def create
        @comment = Comment.new(params[:comment_params])
        if @comment.save
            flash[:notice] = 'Comment was succesfully posted.'
            redirect_to(@comment.post)
        else
            flash[:notice] = "Error creating comments: #{@comment.errors}"
            redirect_to(@comment.post)
        end
    end
end

我所看到的只是，

ActionController::ActionControllerError in CommentsController#create
Cannot redirect to nil!

Rails.root: c:/sites/myrubyblog

Application Trace | Framework Trace | Full Trace
app/controllers/comments_controller.rb:13:in `create'

通过评论else块中的redirect_to将通过另一个错误说错过模板！

尝试过以前提出的问题中的一些解决方案，但没有任何帮助！

Answer 1

在你的else块中也会重定向到@ comment.post，即使它没有保存。所以基本上它是零。我不认为你的评论被保存了。尝试这样做以确定是否有任何错误

if @comment.save! # this will show errors if any
  ...
else
  post = Post.find(params[:post_id])
  redirect_to post
end

我假设你的params中有post_id。如果不是@ comment.post也将是零。导致if和else块中的错误。

Answer 2

else
   flash[:notice] = "Error creating comments: #{@comment.errors}"
   redirect_to(@comment.post) <--
end

如果保存失败，它会尝试重定向到@comment.post，但它没有，因为您没有正确设置post_id

@comment = Comment.new(params[:comment_params])

哪个应该是

@comment = Comment.new(comment_params)

Answer 3

不是params[:comment_params]而是comment_params，您应该将create操作更改为此操作，并确保设置post_id：

class CommentsController < InheritedResources::Base
    def comment_params
        params.require(:comment).permit(:name, :email, :body, :post_id)
    end

    def create
        @comment = Comment.new(comment_params)
        if @comment.save
            flash[:notice] = 'Comment was succesfully posted.'
            redirect_to(@comment.post)
        else
            flash[:notice] = "Error creating comments: #{@comment.errors}"
            redirect_to(@comment.post)
        end
    end
end

CommentController中的ActionController :: ActionControllerError #create

3 个答案: