`method_missing'：用户的未定义方法`devise'（调用'User.connection'建立连接）
我是Ruby on Rails的新手，我正在努力创建我的第一个应用程序。我运行任何rails generate命令时都会遇到问题。我收到以下错误
MyUsers-MacBook-Pro:MyApp MyUser$ rails generate devise:install
Warning: Running `gem pristine --all` to regenerate your installed gemspecs (and deleting then reinstalling your bundle if you use bundle --path) will improve the startup performance of Spring.
/Users/MyUser/.gem/ruby/2.0.0/gems/activerecord-4.1.2.rc1/lib/active_record/dynamic_matchers.rb:26:in `method_missing': undefined method `devise' for User (call 'User.connection' to establish a connection):Class (NoMethodError)
from /Users/MyUser/.Trash/MyApp/app/models/user.rb:4:in `<class:User>'
from /Users/MyUser/.Trash/MyApp/app/models/user.rb:1:in `<top (required)>'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:443:in `load'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:443:in `block in load_file'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:633:in `new_constants_in'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:442:in `load_file'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:342:in `require_or_load'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:480:in `load_missing_constant'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:180:in `const_missing'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/inflector/methods.rb:238:in `const_get'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/inflector/methods.rb:238:in `block in constantize'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/inflector/methods.rb:236:in `each'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/inflector/methods.rb:236:in `inject'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/inflector/methods.rb:236:in `constantize'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:552:in `get'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:583:in `constantize'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise.rb:297:in `get'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:77:in `to'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:72:in `modules'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:89:in `routes'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:156:in `default_used_route'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise/mapping.rb:66:in `initialize'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise.rb:331:in `new'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise.rb:331:in `add_mapping'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise/rails/routes.rb:221:in `block in devise_for'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise/rails/routes.rb:220:in `each'
from /Library/Ruby/Gems/2.0.0/gems/devise-3.2.4/lib/devise/rails/routes.rb:220:in `devise_for'
from /Users/MyUser/.Trash/MyApp/config/routes.rb:2:in `block in <top (required)>'
from /Users/MyUser/.gem/ruby/2.0.0/gems/actionpack-4.1.2.rc1/lib/action_dispatch/routing/route_set.rb:337:in `instance_exec'
from /Users/MyUser/.gem/ruby/2.0.0/gems/actionpack-4.1.2.rc1/lib/action_dispatch/routing/route_set.rb:337:in `eval_block'
from /Users/MyUser/.gem/ruby/2.0.0/gems/actionpack-4.1.2.rc1/lib/action_dispatch/routing/route_set.rb:315:in `draw'
from /Users/MyUser/.Trash/MyApp/config/routes.rb:1:in `<top (required)>'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:241:in `load'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:241:in `block in load'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:232:in `load_dependency'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:241:in `load'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application/routes_reloader.rb:40:in `block in load_paths'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application/routes_reloader.rb:40:in `each'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application/routes_reloader.rb:40:in `load_paths'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application/routes_reloader.rb:16:in `reload!'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application/routes_reloader.rb:26:in `block in updater'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/file_update_checker.rb:75:in `call'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/file_update_checker.rb:75:in `execute'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application/routes_reloader.rb:27:in `updater'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application/routes_reloader.rb:7:in `execute_if_updated'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application/finisher.rb:71:in `block in <module:Finisher>'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/initializable.rb:30:in `instance_exec'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/initializable.rb:30:in `run'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/initializable.rb:55:in `block in run_initializers'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:150:in `block in tsort_each'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:183:in `block (2 levels) in each_strongly_connected_component'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:219:in `each_strongly_connected_component_from'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:182:in `block in each_strongly_connected_component'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:180:in `each'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:180:in `each_strongly_connected_component'
from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/tsort.rb:148:in `tsort_each'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/initializable.rb:54:in `run_initializers'
from /Users/MyUser/.gem/ruby/2.0.0/gems/railties-4.1.2.rc1/lib/rails/application.rb:300:in `initialize!'
from /Users/MyUser/.Trash/MyApp/config/environment.rb:5:in `<top (required)>'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:247:in `require'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:247:in `block in require'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:232:in `load_dependency'
from /Users/MyUser/.gem/ruby/2.0.0/gems/activesupport-4.1.2.rc1/lib/active_support/dependencies.rb:247:in `require'
from /Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:92:in `preload'
from /Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:140:in `serve'
from /Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:128:in `block in run'
from /Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:122:in `loop'
from /Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application.rb:122:in `run'
from /Library/Ruby/Gems/2.0.0/gems/spring-1.1.3/lib/spring/application/boot.rb:18:in `<top (required)>'
from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /Library/Ruby/Site/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from -e:1:in `<main>'
即使我没有将gem 'devise'添加到我的Gemfile中，我仍然会收到该错误。我甚至创建了一个新的应用程序并得到了这个错误。
我甚至在undefined method 'devise' for User
尝试了答案知道我怎么能摆脱这个错误吗？
修改
我目前没有任何型号
9 个答案:
答案 0 :(得分：37)
这是因为您错过了命令：
rails generate devise:install
您只需要暂时（在routes.rb / user.rb中）对所有设计线进行评论，以免加注。
并再次运行命令。
答案 1 :(得分：15)
这是合适的订单。
gem 'devise'
Run the bundle command to install it.
rails generate devise:install
rails generate devise MODEL
此处模型是在＆＃34; rails生成设计之前创建的：安装＆＃34;。因此，您必须返回评论模型创建的所有内容：
class User < ActiveRecord::Base
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
#devise :database_authenticatable, :registerable,
#:recoverable, :rememberable, :trackable, :validatable
end
还有这个
Rails.application.routes.draw do
#devise_for :users
end
现在，运行＆＃34; rails生成设计：安装＆＃34;然后取消上述内容。
答案 2 :(得分：1)
我遇到了一个类似的问题，现有项目刚刚从回购中检出：
具体丢失的文件是：
config/initializers/devise.rb
config/locales/devise.en.yml
在这种情况下，因为devise.rb列在.gitignore列表中，所以可以复制config/initializers/devise.rb.example个文件。
答案 3 :(得分：1)
或者，像我一样，添加：
gem 'devise'
到Gemfile，然后运行：
$ bundle install
您忘记重新启动服务器， Ctrl C 并且：
$ rails s
答案 4 :(得分：1)
这也是我遇到的一个奇怪的问题！尝试在app / models / install.rb文件中添加extend Devise::Models，如以下链接中所述。
答案 5 :(得分：1)
我遇到了同样的问题，Rails产生了设计问题：安装并没有解决它。 我要做的就是在initalizer文件夹下创建devise.rb文件，然后我添加并解决了这个问题
# frozen_string_literal: true
# Assuming you have not yet modified this file, each configuration option below
# is set to its default value. Note that some are commented out while others
# are not: uncommented lines are intended to protect your configuration from
# breaking changes in upgrades (i.e., in the event that future versions of
# Devise change the default values for those options).
#
# Use this hook to configure devise mailer, warden hooks and so forth.
# Many of these configuration options can be set straight in your model.
Devise.setup do |config|
# The secret key used by Devise. Devise uses this key to generate
# random tokens. Changing this key will render invalid all existing
# confirmation, reset password and unlock tokens in the database.
# Devise will use the `secret_key_base` as its `secret_key`
# by default. You can change it below and use your own secret key.
# config.secret_key = '66362ccdcee994048fa373dcafb9ad611dc45ec244ea87db7cf6a9aec8dea4bce4c25ea6b49f97a0db61bf62738e937939e56d54417b5c4293db54ed7e915939'
# ==> Controller configuration
# Configure the parent class to the devise controllers.
# config.parent_controller = 'DeviseController'
# ==> Mailer Configuration
# Configure the e-mail address which will be shown in Devise::Mailer,
# note that it will be overwritten if you use your own mailer class
# with default "from" parameter.
config.mailer_sender = 'please-change-me-at-config-initializers-devise@example.com'
# Configure the class responsible to send e-mails.
# config.mailer = 'Devise::Mailer'
# Configure the parent class responsible to send e-mails.
# config.parent_mailer = 'ActionMailer::Base'
# ==> ORM configuration
# Load and configure the ORM. Supports :active_record (default) and
# :mongoid (bson_ext recommended) by default. Other ORMs may be
# available as additional gems.
require 'devise/orm/active_record'
# ==> Configuration for any authentication mechanism
# Configure which keys are used when authenticating a user. The default is
# just :email. You can configure it to use [:username, :subdomain], so for
# authenticating a user, both parameters are required. Remember that those
# parameters are used only when authenticating and not when retrieving from
# session. If you need permissions, you should implement that in a before filter.
# You can also supply a hash where the value is a boolean determining whether
# or not authentication should be aborted when the value is not present.
# config.authentication_keys = [:email]
# Configure parameters from the request object used for authentication. Each entry
# given should be a request method and it will automatically be passed to the
# find_for_authentication method and considered in your model lookup. For instance,
# if you set :request_keys to [:subdomain], :subdomain will be used on authentication.
# The same considerations mentioned for authentication_keys also apply to request_keys.
# config.request_keys = []
# Configure which authentication keys should be case-insensitive.
# These keys will be downcased upon creating or modifying a user and when used
# to authenticate or find a user. Default is :email.
config.case_insensitive_keys = [:email]
# Configure which authentication keys should have whitespace stripped.
# These keys will have whitespace before and after removed upon creating or
# modifying a user and when used to authenticate or find a user. Default is :email.
config.strip_whitespace_keys = [:email]
# Tell if authentication through request.params is enabled. True by default.
# It can be set to an array that will enable params authentication only for the
# given strategies, for example, `config.params_authenticatable = [:database]` will
# enable it only for database (email + password) authentication.
# config.params_authenticatable = true
# Tell if authentication through HTTP Auth is enabled. False by default.
# It can be set to an array that will enable http authentication only for the
# given strategies, for example, `config.http_authenticatable = [:database]` will
# enable it only for database authentication.
# For API-only applications to support authentication "out-of-the-box", you will likely want to
# enable this with :database unless you are using a custom strategy.
# The supported strategies are:
# :database = Support basic authentication with authentication key + password
# config.http_authenticatable = false
# If 401 status code should be returned for AJAX requests. True by default.
# config.http_authenticatable_on_xhr = true
# The realm used in Http Basic Authentication. 'Application' by default.
# config.http_authentication_realm = 'Application'
# It will change confirmation, password recovery and other workflows
# to behave the same regardless if the e-mail provided was right or wrong.
# Does not affect registerable.
# config.paranoid = true
# By default Devise will store the user in session. You can skip storage for
# particular strategies by setting this option.
# Notice that if you are skipping storage for all authentication paths, you
# may want to disable generating routes to Devise's sessions controller by
# passing skip: :sessions to `devise_for` in your config/routes.rb
config.skip_session_storage = [:http_auth]
# By default, Devise cleans up the CSRF token on authentication to
# avoid CSRF token fixation attacks. This means that, when using AJAX
# requests for sign in and sign up, you need to get a new CSRF token
# from the server. You can disable this option at your own risk.
# config.clean_up_csrf_token_on_authentication = true
# When false, Devise will not attempt to reload routes on eager load.
# This can reduce the time taken to boot the app but if your application
# requires the Devise mappings to be loaded during boot time the application
# won't boot properly.
# config.reload_routes = true
# ==> Configuration for :database_authenticatable
# For bcrypt, this is the cost for hashing the password and defaults to 12. If
# using other algorithms, it sets how many times you want the password to be hashed.
# The number of stretches used for generating the hashed password are stored
# with the hashed password. This allows you to change the stretches without
# invalidating existing passwords.
#
# Limiting the stretches to just one in testing will increase the performance of
# your test suite dramatically. However, it is STRONGLY RECOMMENDED to not use
# a value less than 10 in other environments. Note that, for bcrypt (the default
# algorithm), the cost increases exponentially with the number of stretches (e.g.
# a value of 20 is already extremely slow: approx. 60 seconds for 1 calculation).
config.stretches = Rails.env.test? ? 1 : 12
# Set up a pepper to generate the hashed password.
# config.pepper = '8e15ce2257e97aefdf71654b13e448555015357599d81faa5555566b6a4a6b4c34cb5cb55bd7d0c42eff5af50ea43a547aaef4623b279e03dcd27470e93eb105'
# Send a notification to the original email when the user's email is changed.
# config.send_email_changed_notification = false
# Send a notification email when the user's password is changed.
# config.send_password_change_notification = false
# ==> Configuration for :confirmable
# A period that the user is allowed to access the website even without
# confirming their account. For instance, if set to 2.days, the user will be
# able to access the website for two days without confirming their account,
# access will be blocked just in the third day.
# You can also set it to nil, which will allow the user to access the website
# without confirming their account.
# Default is 0.days, meaning the user cannot access the website without
# confirming their account.
# config.allow_unconfirmed_access_for = 2.days
# A period that the user is allowed to confirm their account before their
# token becomes invalid. For example, if set to 3.days, the user can confirm
# their account within 3 days after the mail was sent, but on the fourth day
# their account can't be confirmed with the token any more.
# Default is nil, meaning there is no restriction on how long a user can take
# before confirming their account.
# config.confirm_within = 3.days
# If true, requires any email changes to be confirmed (exactly the same way as
# initial account confirmation) to be applied. Requires additional unconfirmed_email
# db field (see migrations). Until confirmed, new email is stored in
# unconfirmed_email column, and copied to email column on successful confirmation.
config.reconfirmable = true
# Defines which key will be used when confirming an account
# config.confirmation_keys = [:email]
# ==> Configuration for :rememberable
# The time the user will be remembered without asking for credentials again.
# config.remember_for = 2.weeks
# Invalidates all the remember me tokens when the user signs out.
config.expire_all_remember_me_on_sign_out = true
# If true, extends the user's remember period when remembered via cookie.
# config.extend_remember_period = false
# Options to be passed to the created cookie. For instance, you can set
# secure: true in order to force SSL only cookies.
# config.rememberable_options = {}
# ==> Configuration for :validatable
# Range for password length.
config.password_length = 6..128
# Email regex used to validate email formats. It simply asserts that
# one (and only one) @ exists in the given string. This is mainly
# to give user feedback and not to assert the e-mail validity.
config.email_regexp = /\A[^@\s]+@[^@\s]+\z/
# ==> Configuration for :timeoutable
# The time you want to timeout the user session without activity. After this
# time the user will be asked for credentials again. Default is 30 minutes.
# config.timeout_in = 30.minutes
# ==> Configuration for :lockable
# Defines which strategy will be used to lock an account.
# :failed_attempts = Locks an account after a number of failed attempts to sign in.
# :none = No lock strategy. You should handle locking by yourself.
# config.lock_strategy = :failed_attempts
# Defines which key will be used when locking and unlocking an account
# config.unlock_keys = [:email]
# Defines which strategy will be used to unlock an account.
# :email = Sends an unlock link to the user email
# :time = Re-enables login after a certain amount of time (see :unlock_in below)
# :both = Enables both strategies
# :none = No unlock strategy. You should handle unlocking by yourself.
# config.unlock_strategy = :both
# Number of authentication tries before locking an account if lock_strategy
# is failed attempts.
# config.maximum_attempts = 20
# Time interval to unlock the account if :time is enabled as unlock_strategy.
# config.unlock_in = 1.hour
# Warn on the last attempt before the account is locked.
# config.last_attempt_warning = true
# ==> Configuration for :recoverable
#
# Defines which key will be used when recovering the password for an account
# config.reset_password_keys = [:email]
# Time interval you can reset your password with a reset password key.
# Don't put a too small interval or your users won't have the time to
# change their passwords.
config.reset_password_within = 6.hours
# When set to false, does not sign a user in automatically after their password is
# reset. Defaults to true, so a user is signed in automatically after a reset.
# config.sign_in_after_reset_password = true
# ==> Configuration for :encryptable
# Allow you to use another hashing or encryption algorithm besides bcrypt (default).
# You can use :sha1, :sha512 or algorithms from others authentication tools as
# :clearance_sha1, :authlogic_sha512 (then you should set stretches above to 20
# for default behavior) and :restful_authentication_sha1 (then you should set
# stretches to 10, and copy REST_AUTH_SITE_KEY to pepper).
#
# Require the `devise-encryptable` gem when using anything other than bcrypt
# config.encryptor = :sha512
# ==> Scopes configuration
# Turn scoped views on. Before rendering "sessions/new", it will first check for
# "users/sessions/new". It's turned off by default because it's slower if you
# are using only default views.
# config.scoped_views = false
# Configure the default scope given to Warden. By default it's the first
# devise role declared in your routes (usually :user).
# config.default_scope = :user
# Set this configuration to false if you want /users/sign_out to sign out
# only the current scope. By default, Devise signs out all scopes.
# config.sign_out_all_scopes = true
# ==> Navigation configuration
# Lists the formats that should be treated as navigational. Formats like
# :html, should redirect to the sign in page when the user does not have
# access, but formats like :xml or :json, should return 401.
#
# If you have any extra navigational formats, like :iphone or :mobile, you
# should add them to the navigational formats lists.
#
# The "*/*" below is required to match Internet Explorer requests.
# config.navigational_formats = ['*/*', :html]
# The default HTTP method used to sign out a resource. Default is :delete.
config.sign_out_via = :delete
# ==> OmniAuth
# Add a new OmniAuth provider. Check the wiki for more information on setting
# up on your models and hooks.
# config.omniauth :github, 'APP_ID', 'APP_SECRET', scope: 'user,public_repo'
# ==> Warden configuration
# If you want to use other strategies, that are not supported by Devise, or
# change the failure app, you can configure them inside the config.warden block.
#
# config.warden do |manager|
# manager.intercept_401 = false
# manager.default_strategies(scope: :user).unshift :some_external_strategy
# end
# ==> Mountable engine configurations
# When using Devise inside an engine, let's call it `MyEngine`, and this engine
# is mountable, there are some extra configurations to be taken into account.
# The following options are available, assuming the engine is mounted as:
#
# mount MyEngine, at: '/my_engine'
#
# The router that invoked `devise_for`, in the example above, would be:
# config.router_name = :my_engine
#
# When using OmniAuth, Devise cannot automatically set OmniAuth path,
# so you need to do it manually. For the users scope, it would be:
# config.omniauth_path_prefix = '/my_engine/users/auth'
# ==> Turbolinks configuration
# If your app is using Turbolinks, Turbolinks::Controller needs to be included to make redirection work correctly:
#
# ActiveSupport.on_load(:devise_failure_app) do
# include Turbolinks::Controller
# end
# ==> Configuration for :registerable
# When set to false, does not sign a user in automatically after their password is
# changed. Defaults to true, so a user is signed in automatically after changing a password.
# config.sign_in_after_change_password = true
end
答案 6 :(得分：1)
执行以下命令：
rails generate devise:install
rails generate devise MODEL
如果已经安装了devise，并且还如上所述生成了devise模型，但仍然面临错误。
将此代码添加到模型中的User.rb文件
class User < ApplicationRecord
extend Devise::Models
答案 7 :(得分：1)
运行rails generate devise:install创建一个config/initializers/devise.rb文件。
您必须使用Ctrl + C和rails s重新启动服务器，才能使config文件中的更改生效。
否则，刷新页面时会出现相同的错误。
答案 8 :(得分：0)
rails g devise install！= rails g devise:install
我也遇到了这个问题。
执行rails generate devise install（原文如此！）似乎没有任何效果。终端输出是：
$ rails g devise install
Running via Spring preloader in process 5422
invoke active_record
create db/migrate/20180306165306_devise_create_installs.rb
create app/models/install.rb
insert app/models/install.rb
route devise_for :installs
但我错过了分号。恢复这些更改，然后执行rails generate devise:install（注意:和devise之间的install），一切都很顺利。您还可以获得更广泛的输出：
$ rails g devise:install
Running via Spring preloader in process 5218
create config/initializers/devise.rb
create config/locales/devise.en.yml
===============================================================================
Some setup you must do manually if you haven't yet:
1. Ensure you have defined default url options in your environments files. Here
is an example of default_url_options appropriate for a development environment
in config/environments/development.rb:
config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
In production, :host should be set to the actual host of your application.
2. Ensure you have defined root_url to *something* in your config/routes.rb.
For example:
root to: "home#index"
3. Ensure you have flash messages in app/views/layouts/application.html.erb.
For example:
<p class="notice"><%= notice %></p>
<p class="alert"><%= alert %></p>
4. You can copy Devise views (for customization) to your app by running:
rails g devise:views
===============================================================================
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