form_for 未定义的方法`user_path' [英] form_for undefined method `user_path'

问题描述

我收到一个错误:

undefined method `user_path' for #<#<Class:0x007fd1f223ead0>:0x007fd1f2241af0>

当我尝试编辑学生时.我不太了解user_path"方法警报，因为我从未在视图中写过这个.(学生不是模特)而且我没有使用 rails g scaffold 生成它.

when I'm trying to edit a student. I don't really understand the "user_path" method alert since I never write this in the view. (Student is not model) and I didn't use rails g scaffold to generate it.

谢谢

在我的 StudentsController 中:

In my StudentsController :

def edit
  @student = User.find(params[:id])
end

在视图 (edit.html.erb) 中:

In the view (edit.html.erb) :

<%= form_for(@student) do |f| %> ...

在 routes.rb 中:

In routes.rb :

resources :students

推荐答案

你有一个 students_controller 对应于你的 routes 中的 resources :students 行.rb.这将创建使用单词 students 的路由，例如 students_path 和 new_student_path.使用 form_for(@record) 时，url 由对象类确定.在这种情况下，@record 是一个 User 所以当对象是一个新记录和 user_path(@record) 当对象被持久化时.由于您没有定义users_controller，您需要手动设置form_for 的url 来修复此错误

you have a students_controller which corresponds to the resources :students line in your routes.rb. This creates routes that uses the word students like students_path and new_student_path. When using form_for(@record), the url is determined from the objects class. In this case, @record is a User so the path is users_path when the object is a new record and user_path(@record) when the object is persisted. since you don't have a users_controller defined, you need to manually set the url of the form_for to fix this error

form_for @user, url: student_path(@user), html: { method: :put } do |f|

现在，如果您使用名为 _form.html.erb 的部分并在 new 和 edit 操作中使用它，您将遇到问题，因为两个 new 的 url和编辑操作是不同的.你必须把你的观点改成这样

now, if you're using a partial called _form.html.erb and uses this on both the new and edit actions, you're going to have a problem since the urls for both new and edit actions are different. you have to change your views to something like this

# new.html.erb
form_for @user, url: students_path, html: { method: :post } do |f|
  render 'form', f: f

# edit.html.erb
form_for @user, url: student_path(@user), html: { method: :put } do |f|
  render 'form', f: f

# _form.html.erb
f.text_field :name
f.text_field :title

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