我在Rails中的form_for帮助器有问题。我想在论坛应用中编辑Post
尝试调用编辑页面时出现此错误：
ActionView::Template::Error (No route matches
{:action=>"show",
:category=>#<Post id: 1,
user_id: 1,
title: "Die Webseite ist nun online",
body: "<div>Viel Spaß euch allen. Und haltet euch an die ...",
category: "general/announcements",
slug: "die-webseite-ist-nun-online",
created_at: "2018-09-16 01:00:55",
updated_at: "2018-09-16 01:00:55">,
:controller=>"posts",
:id=>"die-webseite-ist-nun-online",
:locale=>:de},
possible unmatched constraints: [:category]):
这是我的Edit动作：
def edit
@post = Post.find(params[:id])
end
这是对form_for
<%= form_for(@post) do |f| %>
我尝试过的事情：
<%= form_for(@post, category: params[:category]) do |f| %>
params[:category]具有正确的值，我测试了它是否为空或nil
提供这样的category参数并不能改变我得到的错误！
编辑：
根据我的routes.rb要求：
Rails.application.routes.draw do
concern :paginatable do
get '(page/:page)', action: :index, on: :collection, as: ''
end
CATEGORY_FILTERS = /(?x)general\/suggestions|general\/member-introductions|
general\/announcements|off-topic\/jobs-and-projects|
off-topic\/miscellaneous|off-topic\/funny-stuff|
ruby-on-rails\/news|ruby-on-rails\/developers|
ruby-on-rails\/tutorials/
scope '(:locale)', locale: /en|de/ do
root 'forum#home'
get '/help', to: 'forum#help'
get '/about', to: 'forum#about'
get '/contact', to: 'forum#contact'
get '/general', to: 'forum#general'
get '/ruby-on-rails', to: 'forum#rubyonrails'
get '/off-topic', to: 'forum#offtopic'
get '/signup', to: 'users#new'
get '/login', to: 'sessions#new'
post '/login', to: 'sessions#create'
delete '/logout', to: 'sessions#destroy'
resources :users, concerns: :paginatable
resources :password_resets, only: %i[new edit create update]
scope '*category', category: CATEGORY_FILTERS do
get '', to: 'posts#index'
resources :posts, concerns: :paginatable
end
end
resources :account_activations, only: [:edit]
end
路线给出的路线
Prefix Verb URI Pattern Controller#Action
root GET /(:locale)(.:format) forum#home {:locale=>/en|de/}
help GET (/:locale)/help(.:format) forum#help {:locale=>/en|de/}
about GET (/:locale)/about(.:format) forum#about {:locale=>/en|de/}
contact GET (/:locale)/contact(.:format) forum#contact {:locale=>/en|de/}
general GET (/:locale)/general(.:format) forum#general {:locale=>/en|de/}
ruby_on_rails GET (/:locale)/ruby-on-rails(.:format) forum#rubyonrails {:locale=>/en|de/}
off_topic GET (/:locale)/off-topic(.:format) forum#offtopic {:locale=>/en|de/}
signup GET (/:locale)/signup(.:format) users#new {:locale=>/en|de/}
login GET (/:locale)/login(.:format) sessions#new {:locale=>/en|de/}
POST (/:locale)/login(.:format) sessions#create {:locale=>/en|de/}
logout DELETE (/:locale)/logout(.:format) sessions#destroy {:locale=>/en|de/}
users GET (/:locale)/users(/page/:page)(.:format) users#index {:locale=>/en|de/}
GET (/:locale)/users(.:format) users#index {:locale=>/en|de/}
POST (/:locale)/users(.:format) users#create {:locale=>/en|de/}
new_user GET (/:locale)/users/new(.:format) users#new {:locale=>/en|de/}
edit_user GET (/:locale)/users/:id/edit(.:format) users#edit {:locale=>/en|de/}
user GET (/:locale)/users/:id(.:format) users#show {:locale=>/en|de/}
PATCH (/:locale)/users/:id(.:format) users#update {:locale=>/en|de/}
PUT (/:locale)/users/:id(.:format) users#update {:locale=>/en|de/}
DELETE (/:locale)/users/:id(.:format) users#destroy {:locale=>/en|de/}
password_resets POST (/:locale)/password_resets(.:format) password_resets#create {:locale=>/en|de/}
new_password_reset GET (/:locale)/password_resets/new(.:format) password_resets#new {:locale=>/en|de/}
edit_password_reset GET (/:locale)/password_resets/:id/edit(.:format) password_resets#edit {:locale=>/en|de/}
password_reset PATCH (/:locale)/password_resets/:id(.:format) password_resets#update {:locale=>/en|de/}
PUT (/:locale)/password_resets/:id(.:format) password_resets#update {:locale=>/en|de/}
GET (/:locale)/*category(.:format) posts#index {:category=>/(?x)gener...rials/, :locale=>/en|de/}
posts GET (/:locale)/*category/posts(/page/:page)(.:format) posts#index {:category=>/(?x)genera...torials/, :locale=>/en|de/}
GET (/:locale)/*category/posts(.:format) posts#index {:category=>/(?x)genera...torials/, :locale=>/en|de/}
POST (/:locale)/*category/posts(.:format) posts#create {:category=>/(?x)genera..torials/, :locale=>/en|de/}
new_post GET (/:locale)/*category/posts/new(.:format) posts#new {:category=>/(?x)genera...torials/, :locale=>/en|de/}
edit_post GET (/:locale)/*category/posts/:id/edit(.:format) posts#edit {:category=>/(?x)genera...orials/, :locale=>/en|de/}
post GET (/:locale)/*category/posts/:id(.:format) posts#show {:category=>/(?x)genera...rials/, :locale=>/en|de/}
PATCH (/:locale)/*category/posts/:id(.:format) posts#update {:category=>/(?x)gene...rials/, :locale=>/en|de/}
PUT (/:locale)/*category/posts/:id(.:format) posts#update {:category=>/(?x)genera...orials/, :locale=>/en|de/}
DELETE (/:locale)/*category/posts/:id(.:format) posts#destroy {:category=>/(?x)gene...rials/, :locale=>/en|de/}
edit_account_activation GET /account_activations/:id/edit(.:format) account_activations#edit
rails_service_blob GET /rails/active_storage/blobs/:signed_id/*filename(.:format) active_storage/blobs#show
rails_blob_representation GET /rails/active_storage/representations/:signed_blob_id/:variation_key/*filename(.:format) active_storage/representations#show
rails_disk_service GET /rails/active_storage/disk/:encoded_key/*filename(.:format) active_storage/disk#show
update_rails_disk_service PUT /rails/active_storage/disk/:encoded_token(.:format) active_storage/disk#update
rails_direct_uploads POST /rails/active_storage/direct_uploads(.:format) active_storage/direct_uploads#create
答案 0 :(得分：0)
也许尝试为form_for助手指定所有选项：
<%= form_for :post, url: post_path(@post, category: params[:category]), method: :patch do |f| %>