私はこの「未定義のメソッドは、ゼロのため 『になる』:NilClass」それはすべきではない
をすれば、これはエラーundefined method `becomes' for nil:NilClass
を提起
unless resource.nil?
resource = resource.becomes(Accounts::Admin)
end
今日スニペットをテストしていました
unless resource.nil?
a = resource.becomes(Accounts::Admin)
resource = a
end
すべてが正しく機能します。
=
演算子の右部分が最初に実行される場合の相違点は何ですか?
EDIT:
厄介な何かが起こっている、if false
下の最後の行が実行されているが、 "ALOHA" が印刷されることはありません。
<%
puts "AAAA #{resource.inspect}"
if false
puts "ALOHA"
# this line is being executed !
# if I comment it out the BBBB output is correct
resource = nil
end
puts "BBBB #{resource.inspect}"
%>
それは
AAAA User id: nil, nome: nil, endereco_id: nil, created_at: nil, updated_at: nil, email: ""
BBBB nil
を出力しますが、私はこの
<%
res = resource
puts "AAAA #{res.inspect}"
if false
puts "ALOHA"
res = nil
end
puts "BBBB #{res.inspect}"
%>
をすれば、それは正しく
AAAA User id: nil, nome: nil, endereco_id: nil, created_at: nil, updated_at: nil, email: ""
BBBB User id: nil, nome: nil, endereco_id: nil, created_at: nil, updated_at: nil, email: ""
を印刷する私はすでに、サーバーを再起動しようとしています。このスニペットはdevise/registrations/new.html.erb
です。 resource
変数は、User
のインスタンスであり、deviseのRegistrationControllerによって作成されたものです。
隠し文字のテキストをチェックしました。ここに貼り付けたスニペットは、テストするファイルの全文です。
この
は~/.rvm/gems/[email protected]/gems/devise-4.2.0/app/controllers/devise/registrations_controller.rb
で、コントローラの内容である
class Devise::RegistrationsController < DeviseController
prepend_before_action :require_no_authentication, only: [:new, :create, :cancel]
prepend_before_action :authenticate_scope!, only: [:edit, :update, :destroy]
prepend_before_action :set_minimum_password_length, only: [:new, :edit]
# GET /resource/sign_up
def new
build_resource({})
yield resource if block_given?
respond_with resource
end
# POST /resource
def create
build_resource(sign_up_params)
resource.save
yield resource if block_given?
if resource.persisted?
if resource.active_for_authentication?
set_flash_message! :notice, :signed_up
sign_up(resource_name, resource)
respond_with resource, location: after_sign_up_path_for(resource)
else
set_flash_message! :notice, :"signed_up_but_#{resource.inactive_message}"
expire_data_after_sign_in!
respond_with resource, location: after_inactive_sign_up_path_for(resource)
end
else
clean_up_passwords resource
set_minimum_password_length
respond_with resource
end
end
# GET /resource/edit
def edit
render :edit
end
# PUT /resource
# We need to use a copy of the resource because we don't want to change
# the current user in place.
def update
self.resource = resource_class.to_adapter.get!(send(:"current_#{resource_name}").to_key)
prev_unconfirmed_email = resource.unconfirmed_email if resource.respond_to?(:unconfirmed_email)
resource_updated = update_resource(resource, account_update_params)
yield resource if block_given?
if resource_updated
if is_flashing_format?
flash_key = update_needs_confirmation?(resource, prev_unconfirmed_email) ?
:update_needs_confirmation : :updated
set_flash_message :notice, flash_key
end
bypass_sign_in resource, scope: resource_name
respond_with resource, location: after_update_path_for(resource)
else
clean_up_passwords resource
respond_with resource
end
end
# DELETE /resource
def destroy
resource.destroy
Devise.sign_out_all_scopes ? sign_out : sign_out(resource_name)
set_flash_message! :notice, :destroyed
yield resource if block_given?
respond_with_navigational(resource){ redirect_to after_sign_out_path_for(resource_name) }
end
# GET /resource/cancel
# Forces the session data which is usually expired after sign
# in to be expired now. This is useful if the user wants to
# cancel oauth signing in/up in the middle of the process,
# removing all OAuth session data.
def cancel
expire_data_after_sign_in!
redirect_to new_registration_path(resource_name)
end
protected
def update_needs_confirmation?(resource, previous)
resource.respond_to?(:pending_reconfirmation?) &&
resource.pending_reconfirmation? &&
previous != resource.unconfirmed_email
end
# By default we want to require a password checks on update.
# You can overwrite this method in your own RegistrationsController.
def update_resource(resource, params)
resource.update_with_password(params)
end
# Build a devise resource passing in the session. Useful to move
# temporary session data to the newly created user.
def build_resource(hash=nil)
self.resource = resource_class.new_with_session(hash || {}, session)
end
# Signs in a user on sign up. You can overwrite this method in your own
# RegistrationsController.
def sign_up(resource_name, resource)
sign_in(resource_name, resource)
end
# The path used after sign up. You need to overwrite this method
# in your own RegistrationsController.
def after_sign_up_path_for(resource)
after_sign_in_path_for(resource)
end
# The path used after sign up for inactive accounts. You need to overwrite
# this method in your own RegistrationsController.
def after_inactive_sign_up_path_for(resource)
scope = Devise::Mapping.find_scope!(resource)
router_name = Devise.mappings[scope].router_name
context = router_name ? send(router_name) : self
context.respond_to?(:root_path) ? context.root_path : "/"
end
# The default url to be used after updating a resource. You need to overwrite
# this method in your own RegistrationsController.
def after_update_path_for(resource)
signed_in_root_path(resource)
end
# Authenticates the current scope and gets the current resource from the session.
def authenticate_scope!
send(:"authenticate_#{resource_name}!", force: true)
self.resource = send(:"current_#{resource_name}")
end
def sign_up_params
devise_parameter_sanitizer.sanitize(:sign_up)
end
def account_update_params
devise_parameter_sanitizer.sanitize(:account_update)
end
def translation_scope
'devise.registrations'
end
end
ルビー2.3.3 レール(4.2.7.1) 工夫(4.2.0)
'resource'は、deviseコントローラのメソッドです。状況を説明するならば、' resource'は優先度を持ち、メソッドをシャドウする変数を作成すると 'resource'がメソッドを呼び出します。変数の代わりにメソッドを使用するには 'self.resource'を行う必要があります。 – Kris