Question

我在评论框之前创建了一个添加评论的表单。遗憾的是，似乎这个表单在集合中创建了一个空对象，该对象在没有内容的注释中显示。我该如何防止这种情况？

.comments
      = simple_form_for [@post, @post.comments.build] do |f|
        = f.input :content, label: "Comment"
        = f.button :submit

      - @post.comments.each do |c|
        p = c.content
        p = c.user.profile.full_name unless c.user.nil? || c.user.profile.nil?

# comments_controller.rb
class CommentsController < ApplicationController
  before_action :find_commentable

  def index
    @commentable = find_commentable
    @comments = @commentable.comments
  end

  def create
    @commentable = find_commentable
    @comment = @commentable.comments.build(comment_params)
    @comment.user = current_user

    if @comment.save
      flash[:notice] = "Successfully created comment."
      redirect_to @commentable
    else
      redirect_to @commentable
    end
  end

  private
    def comment_params
      params.require(:comment).permit(:content)
    end

    def find_commentable
      params.each do |name, value|
        if name =~ /(.+)_id$/
          return $1.classify.constantize.find(value)
        end
      end
      nil
    end
end

Answer 1

您可以做的是不显示非持久性记录。你可以这样做：

- @post.comments.each do |c|
  - next unless c.persisted?
  ...

或：

- @post.comments.find_all(&:persisted?).each do |c|
  ...

Rails simple_form在集合中创建空项

1 个答案: