UsersController＃create中的ActionController :: ParameterMissing [英] ActionController::ParameterMissing in UsersController#create

问题描述

我的错误页面告诉我参数缺失或值为空：用户，并引用了我的user_params私有方法和创建动作作为罪魁祸首。它还表明，我传递的所有参数都已由create post拾取。

My error page tells me "param is missing or the value is empty: user" and references my user_params private method and my create action as the culprits. It also shows that all the params I'm passing in are getting picked up by the create post.

缩写控制器：

  def new
    @user = User.new
  end

  def create
    @user = User.new(user_params)
    @user.save
    redirect_to @user
  end

  private

  def set_user
    @user = User.find(params[:id])
  end

  def user_params
    params.require(:user).permit(:first_name, :last_name, :email)
  end

启动创建帖子的form_tag：

My form_tag that initiates the create post:

= form_tag @user do
  .form-group
    = label_tag :first_name, nil, class: 'col-md-2'
    = text_field_tag :first_name, nil, class: 'col-md-3'
    %br
  .form-group
    = label_tag :last_name, nil, class: 'col-md-2'
    = text_field_tag :last_name, nil, class: 'col-md-3'
    %br
  .form-group
    = label_tag :email, nil, class: 'col-md-2'
    = email_field_tag :email, nil, class: 'col-md-3'
    %br
  .actions.form-group
    = submit_tag 'Submit', class: 'btn btn-primary col-md-offset-2'

推荐答案

更改：

= form_tag @user do

到

= form_for @user do |f|

然后所有 label_tag 到 f.label ， text_field_tag 到 f.text_field ， email_field_tag 到 f.email_field ，最后 submit_tag 到 f。提交。删除所有nil，一切都应该正常工作。

And then all label_tag to f.label, text_field_tag to f.text_field, email_field_tag to f.email_field and finally submit_tag to f.submit. Remove all nils and all should work.

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