Question

我正在使用strip查看电子邮件，但它给了我这个问题，请帮帮我。

UsersController＃check_email中的NoMethodError nil的未定义方法`strip'：NilClass

  def check_email

    if params[:email].blank? 
    @email = params[:email].strip
    user = User.find_by_email(@email)
    if user.nil?
      text = "false"
    else
      text = "true"
    end
    render :text => text

  else
    render :text =>text
    end 
  end

Answer 1

根据塞尔吉奥和布拉德的反馈意见：

def check_email
  text = params[:email].present? && User.where(email: params[:email].strip).exists?
  render :text => text
end

Answer 2

将其更新为： -

def check_email
  if params[:email].present? 
    @email = params[:email].strip
    user = User.find_by_email(@email)
    unless user.present?
      text = "false"
    else
      text = "true"
    end
    render :text => text
  else
    render :text =>text
  end 
end

Answer 3

您有小错误，需要使用：

unless params[:email].blank?

或者，

if params[:email].present?

我建议您阅读blank? vs nil? vs empty? vs present?

Answer 4

if params[:email].blank?应为if params[:email].present?。问题是当params[:email]为零时，您正在调用strip方法，即nil.strip

所以改成它跟随

  def check_email
    if params[:email].present? 
      @email = params[:email].strip
      user = User.find_by_email(@email)
      text = user.nil? ? "false" : "true"
    else      
      text = "please enter email address"
    end 
    render :text =>text
  end

ROR剥离问题

4 个答案: