意图
我已经按照Devise文档所示创建了一个User模型。后来，我搭建了一个控制器和视图，以便有一个索引和一个可视界面来处理我的用户。
问题
访问edit_user_path后，我向数据库提交了一个新用户，SQLite添加了记录（因此正在保存信息），但是发生了一些事情，并且我没有重定向到根目录，而是得到了异常：
ActionController::UnknownFormat in Devise::RegistrationsController#create
我如何解决此异常并使Rails流到root_path？
我在这里向您添加文件，以便您了解正在发生的事情：
routes.rb
#RESTful routes
devise_for :users
resources :users, :except => [:create]
resources :clans
resources :games
resources :matches
#Root and debug
root :to => 'debug#features'
耙道
Prefix Verb URI Pattern Controller#Action
new_user_session GET /users/sign_in(.:format) devise/sessions#new
user_session POST /users/sign_in(.:format) devise/sessions#create
destroy_user_session DELETE /users/sign_out(.:format) evise/sessions#destroy
user_password POST /users/password(.:format) devise/passwords#create
new_user_password GET /users/password/new(.:format) devise/passwords#new
edit_user_password GET /users/password/edit(.:format) devise/passwords#edit
PATCH /users/password(.:format) devise/passwords#update
PUT /users/password(.:format) devise/passwords#update
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
users GET /users(.:format) users#index
POST /users(.:format) users#create
new_user GET /users/new(.:format) users#new
edit_user GET /users/:id/edit(.:format) users#edit
user GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update
PUT /users/:id(.:format) users#update
DELETE /users/:id(.:format) users#destroy
clans GET /clans(.:format) clans#index
POST /clans(.:format) clans#create
new_clan GET /clans/new(.:format) clans#new
edit_clan GET /clans/:id/edit(.:format) clans#edit
clan GET /clans/:id(.:format) clans#show
PATCH /clans/:id(.:format) clans#update
PUT /clans/:id(.:format) clans#update
DELETE /clans/:id(.:format) clans#destroy
games GET /games(.:format) games#index
POST /games(.:format) games#create
new_game GET /games/new(.:format) games#new
edit_game GET /games/:id/edit(.:format) games#edit
game GET /games/:id(.:format) games#show
PATCH /games/:id(.:format) games#update
PUT /games/:id(.:format) games#update
DELETE /games/:id(.:format) games#destroy
matches GET /matches(.:format) matches#index
POST /matches(.:format) matches#create
new_match GET /matches/new(.:format) matches#new
edit_match GET /matches/:id/edit(.:format) matches#edit
match GET /matches/:id(.:format) matches#show
PATCH /matches/:id(.:format) matches#update
PUT /matches/:id(.:format) matches#update
DELETE /matches/:id(.:format) matches#destroy
root GET / debug#features
debug_features GET /debug/features(.:format) debug#features
edit_user_path：渲染设计/注册/new.html.erb：form_for
form_for(resource, as: resource_name, url: user_registration_path(resource_name))
cmd中显示的POST和SQL（Windows 8）
Started POST "/users.user" for 127.0.0.1 at 2015-12-17 21:18:41 +0100
Processing by Devise::RegistrationsController#create as
Parameters: {"utf8"=>"V", "authenticity_token"=>"EUP/Aylqxv7fKSe4Rm37IO09bgfar
ayFcoaLsKiF9zC7vUxgtwciM/TgDfCuLAr1NecxTgJukDGTRQ7L18AkGg==", "user"=>{"name"=>"
aaa", "email"=>"[email protected]", "password"=>"[FILTERED]", "password_confirmation"=
>"[FILTERED]", "city"=>"Valencia", "country"=>"", "birth"=>"", "about"=>"", "lik
es"=>"da", "style"=>"asd", "steam"=>"", "psn"=>"", "xbox"=>"", "twitter"=>""}, "
commit"=>"Sign up"}
(0.0ms) begin transaction
User Exists (0.0ms) SELECT 1 AS one FROM "users" WHERE "users"."email" = 'aa
[email protected]' LIMIT 1
SQL (1.0ms) INSERT INTO "users" ("email", "encrypted_password", "name", "city
", "country", "about", "likes", "style", "steam", "psn", "xbox", "twitter", "cre
ated_at", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) [["em
ail", "[email protected]"], ["encrypted_password", "$2a$10$nRaRhwdq3h9bYDdDcoGbIOfirQp
6jHygl55vvhhaLePN7WET6N0xG"], ["name", "aaa"], ["city", "Valencia"], ["country",
""], ["about", ""], ["likes", "da"], ["style", "asd"], ["steam", ""], ["psn", "
"], ["xbox", ""], ["twitter", ""], ["created_at", "2015-12-17 20:18:41.522714"],
["updated_at", "2015-12-17 20:18:41.522714"]]
(437.6ms) commit transaction
User Load (1.0ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? ORDE
R BY "users"."id" ASC LIMIT 1 [["id", 1]]
(0.0ms) begin transaction
SQL (1.0ms) UPDATE "users" SET "last_sign_in_at" = ?, "current_sign_in_at" =
?, "last_sign_in_ip" = ?, "current_sign_in_ip" = ?, "sign_in_count" = ?, "update
d_at" = ? WHERE "users"."id" = ? [["last_sign_in_at", "2015-12-17 20:18:41.9973
08"], ["current_sign_in_at", "2015-12-17 20:18:41.997308"], ["last_sign_in_ip",
"127.0.0.1"], ["current_sign_in_ip", "127.0.0.1"], ["sign_in_count", 1], ["updat
ed_at", "2015-12-17 20:18:41.999315"], ["id", 5]]
(117.0ms) commit transaction
Completed 406 Not Acceptable in 756ms (ActiveRecord: 557.6ms)
Traceback
responders (2.1.0) lib/action_controller/respond_with.rb:205:in `respond_with'
devise (3.5.3) app/controllers/devise/registrations_controller.rb:23:in `create'
actionpack (4.2.5) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.2.5) lib/abstract_controller/base.rb:198:in `process_action'
actionpack (4.2.5) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.2.5) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.2.5) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.5) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.5) lib/active_support/callbacks.rb:555:in `block (2 levels) in compile'
activesupport (4.2.5) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.5) lib/active_support/callbacks.rb:505:in `call'
activesupport (4.2.5) lib/active_support/callbacks.rb:92:in `__run_callbacks__'
activesupport (4.2.5) lib/active_support/callbacks.rb:778:in `_run_process_action_callbacks'
activesupport (4.2.5) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.5) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.2.5) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.2.5) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action'
activesupport (4.2.5) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.5) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.5) lib/active_support/notifications.rb:164:in `instrument'
actionpack (4.2.5) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.2.5) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.2.5) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.2.5) lib/abstract_controller/base.rb:137:in `process'
respond_with.rb
def respond_with(*resources, &block)
if self.class.mimes_for_respond_to.empty?
raise "In order to use respond_with, first you need to declare the " \
"formats your controller responds to in the class level."
end
mimes = collect_mimes_from_class_level()
collector = ActionController::MimeResponds::Collector.new(mimes, request.variant)
block.call(collector) if block_given?
if format = collector.negotiate_format(request)
_process_format(format)
options = resources.size == 1 ? {} : resources.extract_options!
options = options.clone
options[:default_response] = collector.response
(options.delete(:responder) || self.class.responder).call(self, resources, options)
else
raise ActionController::UnknownFormat #<-----------line 205
end
end
aplication_controller.rb
class ApplicationController < ActionController::Base
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
protect_from_forgery with: :exception
before_filter :configure_permitted_parameters, if: :devise_controller?
protected
def configure_permitted_parameters
devise_parameter_sanitizer.for(:sign_up) { |u| u.permit(:email, :password, :password_confirmation, :name, :city, :country, :birth, :about, :likes, :style, :steam, :psn, :xbox, :twitter) }
end
end
我不知道是否与您的问题有关，但是您的控制器中有一些重复的（或更好的无用的）路由，也可能有操作。
根据bin/rake routes的结果
cancel_user_registration GET /users/cancel(.:format) devise/registrations#cancel
user_registration POST /users(.:format) devise/registrations#create
new_user_registration GET /users/sign_up(.:format) devise/registrations#new
edit_user_registration GET /users/edit(.:format) devise/registrations#edit
PATCH /users(.:format) devise/registrations#update
PUT /users(.:format) devise/registrations#update
DELETE /users(.:format) devise/registrations#destroy
users GET /users(.:format) users#index
POST /users(.:format) users#create # <-- ?
new_user GET /users/new(.:format) users#new # <-- ?
edit_user GET /users/:id/edit(.:format) users#edit # <-- ?
user GET /users/:id(.:format) users#show
PATCH /users/:id(.:format) users#update # <-- ?
PUT /users/:id(.:format) users#update # <-- ?
DELETE /users/:id(.:format) users#destroy # <-- ?
您已经使用Devise new管理create资源对edit，update，destroy，User和RegistrationController的操作，但是/users/...路径下也列出了类似的操作，以及UsersController中的相关动作。
如果仅在UsersControllers：index和show中保留有用的操作，则保持代码清洁并避免误解会更好。
尝试更改您的routes.rb文件：
devise_for :users
resources :users, only: [:index, :show]
虽然您在设计中得到了ActionController::UnknownFormat in Devise::RegistrationsController#create，但大多数问题出在您的注册表中，请在URL部分中删除resource_name
user_registration_path不需要其他参数，您将resource_name传递给它，在您的情况下，它等于user。它被解释为格式，因此您会获得类似http://localhost:3000/users.user的网址（在这种情况下，用户被设置为格式）。 MORE
之前
form_for(resource, as: resource_name, url: user_registration_path(resource_name))
之后
form_for(resource, as: resource_name, url: user_registration_path)