Herokuのエラーについて質問です。

Question

Herokuのエラーについて質問です。
Herokuにデプロイ後、パスワードの再設定リクエストページにて下記のエラーが表示されました。

Application error
An error occurred in the application and your page could not be served. If you are the application owner, check your logs for details. You can do this from the Heroku CLI with the command
heroku logs --tail

いわれた通りheroku logs --tailを実行すると、下記の内容が表示さました。
rails初心者のためログの見方もいまいち分からず・・・どの箇所を修正すればよいか分からず手詰まりです。

ご助言いただけると幸いです。

2018-11-13T13:09:21.169597+00:00 app[web.1]: I, [2018-11-13T13:09:21.169544 #4]  INFO -- : [0c018ea5-2689-49de-86a9-f70c
b2ba3ac9] Completed 500 Internal Server Error in 60431ms (ActiveRecord: 35.5ms)
2018-11-13T13:09:21.170420+00:00 app[web.1]: F, [2018-11-13T13:09:21.170369 #4] FATAL -- : [0c018ea5-2689-49de-86a9-f70c
b2ba3ac9]
2018-11-13T13:09:21.170492+00:00 app[web.1]: F, [2018-11-13T13:09:21.170445 #4] FATAL -- : [0c018ea5-2689-49de-86a9-f70c
b2ba3ac9] Net::ReadTimeout (Net::ReadTimeout):
2018-11-13T13:09:21.170557+00:00 app[web.1]: F, [2018-11-13T13:09:21.170514 #4] FATAL -- : [0c018ea5-2689-49de-86a9-f70c
b2ba3ac9]
2018-11-13T13:09:21.170628+00:00 app[web.1]: F, [2018-11-13T13:09:21.170584 #4] FATAL -- : [0c018ea5-2689-49de-86a9-f70c
b2ba3ac9] app/models/user.rb:48:in `send_password_reset_email'
2018-11-13T13:09:21.170631+00:00 app[web.1]: [0c018ea5-2689-49de-86a9-f70cb2ba3ac9] app/controllers/password_resets_cont
roller.rb:13:in `create'
2018-11-13T13:09:21.399085+00:00 heroku[router]: at=error code=H12 desc="Request timeout" method=POST path="/password_re
sets" host=www.heroku.com request_id=0ac5a0d2-880b-4a9b-bd33-b8a083d66bf5 fwd="124.140.147.16" dyno=web.1 connect=0
ms service=30000ms status=503 bytes=0 protocol=https
2018-11-13T13:09:51.972973+00:00 app[web.1]: I, [2018-11-13T13:09:51.972872 #4]  INFO -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] Sent mail to [e-mail] (60435.8ms)
2018-11-13T13:09:51.973431+00:00 app[web.1]: D, [2018-11-13T13:09:51.973369 #4] DEBUG -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] Date: Tue, 13 Nov 2018 13:08:51 +0000
2018-11-13T13:09:51.973433+00:00 app[web.1]: From: [e-mail]
2018-11-13T13:09:51.973435+00:00 app[web.1]: To: [e-mail]
2018-11-13T13:09:51.973439+00:00 app[web.1]: Message-ID: <5beacce383800_42ab44baba0c07245e@4b0cbb9f-70d9-4a08-b0e8-87403
e7743f5.mail>
2018-11-13T13:09:51.973441+00:00 app[web.1]: Subject: =?UTF-8?Q?=E3=83=91=E3=82=B9=E3=83=AF=E3=83=BC=E3=83=89=E5=86=8D=E
8=A8=AD=E5=AE=9A=E3=81=AB=E3=81=A4=E3=81=84=E3=81=A6?=
2018-11-13T13:09:51.973442+00:00 app[web.1]: Mime-Version: 1.0
2018-11-13T13:09:51.973444+00:00 app[web.1]: Content-Type: multipart/alternative;
2018-11-13T13:09:51.973446+00:00 app[web.1]: boundary="--==_mimepart_5beacce382abc_42ab44baba0c0723fb";
2018-11-13T13:09:51.973448+00:00 app[web.1]: charset=UTF-8
2018-11-13T13:09:51.973449+00:00 app[web.1]: Content-Transfer-Encoding: 7bit
2018-11-13T13:09:51.973451+00:00 app[web.1]:
2018-11-13T13:09:51.973452+00:00 app[web.1]:
2018-11-13T13:09:51.973454+00:00 app[web.1]: ----==_mimepart_5beacce382abc_42ab44baba0c0723fb
2018-11-13T13:09:51.973455+00:00 app[web.1]: Content-Type: text/plain;
2018-11-13T13:09:51.973457+00:00 app[web.1]: charset=UTF-8
2018-11-13T13:09:51.973458+00:00 app[web.1]: Content-Transfer-Encoding: base64
2018-11-13T13:09:51.973460+00:00 app[web.1]:
2018-11-13T13:09:51.973461+00:00 app[web.1]: 5LiL6KiY44GuVVJM44KS44Kv44Oq44OD44Kv44GX44Gm44CB44OR44K544Ov
2018-11-13T13:09:51.973463+00:00 app[web.1]: 44O844OJ44KS5YaN6Kit5a6a44GX44Gm44GP44Gg44GV44GE44CCDQoNCmh0
2018-11-13T13:09:51.973464+00:00 app[web.1]: dHA6Ly93d3cucmVjaXBlLWNsaXAuY29tL3Bhc3N3b3JkX3Jlc2V0cy9VbkFu
2018-11-13T13:09:51.973465+00:00 app[web.1]: ZnN1YUpubmt5eTdSRWc2RVdnL2VkaXQ/ZW1haWw9MTc1MHhrY20lNDBqY29t
2018-11-13T13:09:51.973467+00:00 app[web.1]: LmhvbWUubmUuanANCjLmmYLplpPku6XlhoXjgavjgqLjgq/jgrvjgrnjgZfj
2018-11-13T13:09:51.973468+00:00 app[web.1]: garjgYTjgajjg5rjg7zjgrjjgYznhKHlirnjgajjgarjgorjgb7jgZnjga7j
2018-11-13T13:09:51.973470+00:00 app[web.1]: gafjgZTms6jmhI/jgY/jgaDjgZXjgYTjgIINCg0K4oC744OR44K544Ov44O8
2018-11-13T13:09:51.973471+00:00 app[web.1]: 44OJ44KS5aSJ5pu044GX44Gq44GE5aC05ZCI44Gv44CB44GT44Gu44Oh44O8
2018-11-13T13:09:51.973473+00:00 app[web.1]: 44Or44KS56C05qOE44GX44Gm44GP44Gg44GV44GE44CCDQrigLvmnKzjg6Hj
2018-11-13T13:09:51.973474+00:00 app[web.1]: g7zjg6vjga/jgrXjg7zjg5Djg7zjgojjgoroh6rli5XpgIHkv6HjgZXjgozj
2018-11-13T13:09:51.973475+00:00 app[web.1]: gabjgYTjgovjgZ/jgoHjgIHov5Tkv6HjgYTjgZ/jgaDjgYTjgabjgoLjgYrn
2018-11-13T13:09:51.973477+00:00 app[web.1]: rZTjgYjjgafjgY3jgb7jgZvjgpPjgIINCg0KUmVjaXBlQ2xpcA0K
2018-11-13T13:09:51.973478+00:00 app[web.1]:
2018-11-13T13:09:51.973479+00:00 app[web.1]: ----==_mimepart_5beacce382abc_42ab44baba0c0723fb
2018-11-13T13:09:51.973481+00:00 app[web.1]: Content-Type: text/html;
2018-11-13T13:09:51.973482+00:00 app[web.1]: charset=UTF-8
2018-11-13T13:09:51.973484+00:00 app[web.1]: Content-Transfer-Encoding: base64
2018-11-13T13:09:51.973485+00:00 app[web.1]:
2018-11-13T13:09:51.973486+00:00 app[web.1]: PCFET0NUWVBFIGh0bWw+DQo8aHRtbD4NCiAgPGhlYWQ+DQogICAgPG1ldGEg
2018-11-13T13:09:51.973503+00:00 app[web.1]: aHR0cC1lcXVpdj0iQ29udGVudC1UeXBlIiBjb250ZW50PSJ0ZXh0L2h0bWw7
2018-11-13T13:09:51.973504+00:00 app[web.1]: IGNoYXJzZXQ9dXRmLTgiIC8+DQogICAgPHN0eWxlPg0KICAgICAgLyogRW1h
2018-11-13T13:09:51.973506+00:00 app[web.1]: aWwgc3R5bGVzIG5lZWQgdG8gYmUgaW5saW5lICovDQogICAgPC9zdHlsZT4N
2018-11-13T13:09:51.973507+00:00 app[web.1]: CiAgPC9oZWFkPg0KDQogIDxib2R5Pg0KICAgIA0KPHA+5LiL6KiY44GuVVJM
2018-11-13T13:09:51.973509+00:00 app[web.1]: 44KS44Kv44Oq44OD44Kv44GX44Gm44CB44OR44K544Ov44O844OJ44KS5YaN
2018-11-13T13:09:51.973510+00:00 app[web.1]: 6Kit5a6a44GX44Gm44GP44Gg44GV44GE44CCPC9wPg0KDQo8YSBocmVmPSJo
2018-11-13T13:09:51.973511+00:00 app[web.1]: dHRwOi8vd3d3LnJlY2lwZS1jbGlwLmNvbS9wYXNzd29yZF9yZXNldHMvVW5B
2018-11-13T13:09:51.973513+00:00 app[web.1]: bmZzdWFKbm5reXk3UkVnNkVXZy9lZGl0P2VtYWlsPTE3NTB4a2NtJTQwamNv
2018-11-13T13:09:51.973514+00:00 app[web.1]: bS5ob21lLm5lLmpwIj5SZXNldCBwYXNzd29yZDwvYT4NCjxwPjLmmYLplpPk
2018-11-13T13:09:51.973516+00:00 app[web.1]: u6XlhoXjgavjgqLjgq/jgrvjgrnjgZfjgarjgYTjgajjg5rjg7zjgrjjgYzn
2018-11-13T13:09:51.973517+00:00 app[web.1]: hKHlirnjgajjgarjgorjgb7jgZnjga7jgafjgZTms6jmhI/jgY/jgaDjgZXj
2018-11-13T13:09:51.973519+00:00 app[web.1]: gYTjgII8L3A+DQoNCjxwPuKAu+ODkeOCueODr+ODvOODieOCkuWkieabtOOB
2018-11-13T13:09:51.973520+00:00 app[web.1]: l+OBquOBhOWgtOWQiOOBr+OAgeOBk+OBruODoeODvOODq+OCkuegtOajhOOB
2018-11-13T13:09:51.973521+00:00 app[web.1]: l+OBpuOBj+OBoOOBleOBhOOAgjwvcD4NCjxwPuKAu+acrOODoeODvOODq+OB
2018-11-13T13:09:51.973523+00:00 app[web.1]: r+OCteODvOODkOODvOOCiOOCiuiHquWLlemAgeS/oeOBleOCjOOBpuOBhOOC
2018-11-13T13:09:51.973524+00:00 app[web.1]: i+OBn+OCgeOAgei/lOS/oeOBhOOBn+OBoOOBhOOBpuOCguOBiuetlOOBiOOB
2018-11-13T13:09:51.973526+00:00 app[web.1]: p+OBjeOBvuOBm+OCk+OAgjwvcD4NCg0KPHA+UmVjaXBlQ2xpcDwvcD4NCiAg
2018-11-13T13:09:51.973527+00:00 app[web.1]: PC9ib2R5Pg0KPC9odG1sPg0K
2018-11-13T13:09:51.973528+00:00 app[web.1]:
2018-11-13T13:09:51.973530+00:00 app[web.1]: ----==_mimepart_5beacce382abc_42ab44baba0c0723fb--
2018-11-13T13:09:51.973531+00:00 app[web.1]:
2018-11-13T13:09:51.974323+00:00 app[web.1]: I, [2018-11-13T13:09:51.974275 #4]  INFO -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] Completed 500 Internal Server Error in 60572ms (ActiveRecord: 31.6ms)
2018-11-13T13:09:51.976153+00:00 app[web.1]: F, [2018-11-13T13:09:51.975909 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5]
2018-11-13T13:09:51.976220+00:00 app[web.1]: F, [2018-11-13T13:09:51.976176 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] Net::ReadTimeout (Net::ReadTimeout):
2018-11-13T13:09:51.976317+00:00 app[web.1]: F, [2018-11-13T13:09:51.976239 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5]
2018-11-13T13:09:51.976390+00:00 app[web.1]: F, [2018-11-13T13:09:51.976344 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] app/models/user.rb:48:in `send_password_reset_email'
2018-11-13T13:09:51.976392+00:00 app[web.1]: [0ac5a0d2-880b-4a9b-bd33-b8a083d66bf5] app/controllers/password_resets_cont
roller.rb:13:in `create'

Answer 1

直接の原因かは不明ですが、production.rbのaction_mailerの設定に誤りを修正したら送信できました。
修正内容については下記ページに記述します。
https://teratail.com/questions/158772

Answer 2

2018-11-13T13:09:51.974323+00:00 app[web.1]: I, [2018-11-13T13:09:51.974275 #4]  INFO -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] Completed 500 Internal Server Error in 60572ms (ActiveRecord: 31.6ms)
2018-11-13T13:09:51.976153+00:00 app[web.1]: F, [2018-11-13T13:09:51.975909 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5]
2018-11-13T13:09:51.976220+00:00 app[web.1]: F, [2018-11-13T13:09:51.976176 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] Net::ReadTimeout (Net::ReadTimeout):
2018-11-13T13:09:51.976317+00:00 app[web.1]: F, [2018-11-13T13:09:51.976239 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5]
2018-11-13T13:09:51.976390+00:00 app[web.1]: F, [2018-11-13T13:09:51.976344 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] app/models/user.rb:48:in `send_password_reset_email'
2018-11-13T13:09:51.976392+00:00 app[web.1]: [0ac5a0d2-880b-4a9b-bd33-b8a083d66bf5] app/controllers/password_resets_cont
roller.rb:13:in `create'

500エラーが出ていますね。その下をもう少し見ると、

2018-11-13T13:09:51.976390+00:00 app[web.1]: F, [2018-11-13T13:09:51.976344 #4] FATAL -- : [0ac5a0d2-880b-4a9b-bd33-b8a0
83d66bf5] app/models/user.rb:48:in `send_password_reset_email'

とあるので、user.rbの48行目で何かしらのバグがあるのではないのでしょうか？

Comments

[1750xkcm]

該当箇所は下記のようになっていました。
特におかしな箇所は見当たらないように思うのですが、
何かお気づきの点がありましたら、ご助言いただけると幸いです。

■user.rb
def send_password_reset_email
UserMailer.password_reset(self).deliver_now
end

■password_resets_controller.rb
def create
@user = User.find_by(email: params[:email].downcase)
if @user
@user.create_reset_digest
@user.send_password_reset_email
@message = "パスワード再設定に必要なご案内を送信しました。"
render("password_resets/new")
else
@message = "該当するメールアドレスが見つかりませんでした。"
render("password_resets/new")
end
end

仮説ですが、メールの設定が誤っているのではないかと感じています。
ちなみにメールの設定は以下の通りです。

■production.rb
config.action_mailer.raise_delivery_errors = true
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
port: 465,
address: 'smtp.heroku.com',
domain: 'smtp.heroku.com',
user_name: '[e-mail]',
password: 'password',
authentication: 'plain',
enable_starttls_auto: true
}

■development.rb
config.action_mailer.raise_delivery_errors = true
config.action_mailer.perform_caching = false
config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }
config.action_mailer.delivery_method = :smtp
config.action_mailer.smtp_settings = {
port: 　465,
address: 'smtp.heroku.com',
domain: 'smtp.heroku.com',
user_name: '[e-mail]',
password: 'password',
authentication: 'plain',
enable_starttls_auto: true
}