Ruby-on-rails form_for 未定义的方法`user_path'
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form_for undefined method `user_path'
提问by Max
I'm getting an error :
我收到一个错误：
undefined method `user_path' for #<#<Class:0x007fd1f223ead0>:0x007fd1f2241af0>
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.
当我试图编辑学生时。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）我没有使用 rails g scaffold 来生成它。
Thanks
谢谢
In my StudentsController :
在我的 StudentsController 中：
def edit
@student = User.find(params[:id])
end
In the view (edit.html.erb) :
在视图 (edit.html.erb) 中：
<%= form_for(@student) do |f| %> ...
In routes.rb :
在 routes.rb 中：
resources :students
回答by jvnill
you have a students_controllerwhich corresponds to the resources :studentsline in your routes.rb. This creates routes that uses the word studentslike students_pathand new_student_path. When using form_for(@record), the url is determined from the objects class. In this case, @recordis a Userso the path is users_pathwhen the object is a new record and user_path(@record)when the object is persisted. since you don't have a users_controllerdefined, you need to manually set the url of the form_forto fix this error
你有一个students_controller对应resources :students于你的routes.rb. 这将创建使用单词studentslikestudents_path和 的路由new_student_path。使用时form_for(@record)，url 由对象类确定。在这种情况下，@record是一个User所以路径是users_path当对象是新记录user_path(@record)时和对象被持久化时。由于您没有users_controller定义，您需要手动设置 urlform_for以修复此错误
form_for @user, url: student_path(@user), html: { method: :put } do |f|
now, if you're using a partial called _form.html.erband 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
现在，如果您使用部分调用_form.html.erb并在 new 和 edit 操作上使用它，您将遇到问题，因为 new 和 edit 操作的 url 不同。你必须把你的观点改成这样
# 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
回答by adominey
If you are here because of the namespace (like me 10 minutes ago) you'll need this:
如果你是因为命名空间（就像我 10 分钟前）来到这里，你需要这个：
For namespaced routes, like admin_post_url:
<%= form_for([:admin, @post]) do |f| %> ... <% end %>
对于命名空间路由，如 admin_post_url：
<%= form_for([:admin, @post]) do |f| %> ... <% end %>
from the doc
从文档
回答by E. Musinov
i fix it with local variables in render . In rails 5 - form_with tag:
我在 render 中用局部变量修复它。在 rails 5 - form_with 标签中：
# new.html.erb
render partial: 'form', locals: {user: @user, url: students_path}
# edit.html.erb
render partial: 'form', locals: {user: @user, url: student_path(@user)}
# _form.html.erb
form_with model: user, url: url, local: true do |f|
f.text_field :name
f.text_field :title
end
