Ruby on rails 使用按钮_将数据发送到控制器

这是按钮：

<%= button_to "I want to understand this.", articles_want_to_understand_path, :id => @article.id, method: :post %>

在控制器中：-

before_action :set_article, only: [:want_to_understand]
def want_to_understand
  @article.user_who_wants_to_understand << current_user
  redirect_to action: :show
end

private

def set_article
  @article = Article.find(params[:id])
end

before\u action:set\u article，only:[：想要\u理解]
我想让你明白
@article.user_希望_理解这不是问题所在，问题是“for nil:NilClass”，这意味着控制器找不到文章。如果我将@article替换为article.first，它不会抛出该错误。请改用
articles\u want\u to\u understand\u path（id:@article.id）
。仍然会出现相同的错误。结果是，我必须将set\u article的内容粘贴到want\u to\u understand中。这样行吗？您还可以使用before_uu回调。
undefined method `user_who_wants_to_understand' for nil:NilClass

before_action :set_article, only: [:want_to_understand]
def want_to_understand
  @article.user_who_wants_to_understand << current_user
  redirect_to action: :show
end

private

def set_article
  @article = Article.find(params[:id])
end

<%= button_to "I want to understand this.", articles_want_to_understand_path(id: @article.id) %>