Exception when deleting a user

[CFGrote]

I get this traceback when attempting to delete a person through the admin panel:
Possibly I'm doing sth. wrong but the message is not very informative.

A RSolr::Error::ConnectionRefused occurred in people#destroy:

Connection refused - {:data=>"{"delete":["Person 5"]}", :headers=>{"Content-Type"=>"application/json"}, :method=>:post, :params=>{:wt=>:json}, :query=>"wt=json", :path=>"update", :uri=>#<URI::HTTP http://localhost:8983/solr/default/update?wt=json>}
(eval):2:in `post'

---

Request:

• URL : https://seek2.evolbio.mpg.de/people/5
• HTTP Method: DELETE
• IP address : XXX.XXX.XXX.XXX
• Parameters : {"_method"=>"delete", "authenticity_token"=>"KdKxyATQZh7s8F10kMr21maWg/GmSgE5Z6l3RHTejSCiNu73PHVwvXCi8keCivEZp6BGygD/B3eJuy+HTvILwQ==", "controller"=>"people", "action"=>"destroy", "id"=>"5"}
• Timestamp : 2019-12-11 10:50:41 UTC
• Server : seek2
• Rails root : /srv/rails/seek
• Process: 20193

---

Session:

• session id: [FILTERED]
• data: {"_csrf_token"=>"i+RfPzilFqOcUq8zEkAHz8E2xTumtQZO7hJYwzoshuE=", "user_id"=>1}

---

Environment:

• CONTENT_LENGTH : 132
• CONTENT_TYPE : application/x-www-form-urlencoded
• HTTPS : on
• HTTP_ACCEPT : text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
• HTTP_ACCEPT_ENCODING : gzip, deflate, br
• HTTP_ACCEPT_LANGUAGE : en-US,en;q=0.5
• HTTP_COOKIE : _seek_session=0bfc5c7f585e7c6cada8924f8010b9db
• HTTP_HOST : seek2.evolbio.mpg.de
• HTTP_REFERER : https://seek2.evolbio.mpg.de/people/5
• HTTP_UPGRADE_INSECURE_REQUESTS : 1
• HTTP_USER_AGENT : Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0
• HTTP_VERSION : HTTP/1.1
• ORIGINAL_FULLPATH : /people/5
• ORIGINAL_SCRIPT_NAME :
• PASSENGER_CONNECT_PASSWORD : [FILTERED]
• PATH_INFO : /people/5
• QUERY_STRING :
• REMOTE_ADDR : XXX.XXX.XXX.XXX
• REMOTE_PORT : 38592
• REQUEST_METHOD : DELETE
• REQUEST_URI : /people/5
• ROUTES_47090685382820_SCRIPT_NAME :
• SCRIPT_NAME :
• SERVER_NAME : seek2.evolbio.mpg.de
• SERVER_PORT : 443
• SERVER_PROTOCOL : HTTP/1.1
• SERVER_SOFTWARE : Apache/2.4.29 (Ubuntu) OpenSSL/1.1.1 Phusion_Passenger/6.0.4
• SSL_TLS_SNI : seek2.evolbio.mpg.de
• action_controller.instance : #PeopleController:0x000055a8575bd588
• action_dispatch.authenticated_encrypted_cookie_salt : authenticated encrypted cookie
• action_dispatch.backtrace_cleaner : #Rails::BacktraceCleaner:0x000055a84efb5a80
• action_dispatch.content_security_policy :
• action_dispatch.content_security_policy_nonce_generator:
• action_dispatch.content_security_policy_report_only : false
• action_dispatch.cookies_digest :
• action_dispatch.cookies_rotations : #ActiveSupport::Messages::RotationConfiguration:0x000055a84dd15308
• action_dispatch.cookies_serializer : json
• action_dispatch.encrypted_cookie_cipher :
• action_dispatch.encrypted_cookie_salt : encrypted cookie
• action_dispatch.encrypted_signed_cookie_salt : signed encrypted cookie
• action_dispatch.http_auth_salt : http authentication
• action_dispatch.key_generator : #ActiveSupport::CachingKeyGenerator:0x000055a85418b058
• action_dispatch.logger : #ActiveSupport::Logger:0x000055a852db9778
• action_dispatch.parameter_filter : [:password, "rack.request.form_vars"]
• action_dispatch.redirect_filter : []
• action_dispatch.remote_ip : XXX.XXX.XXX.XXX
• action_dispatch.request.content_type : application/x-www-form-urlencoded
• action_dispatch.request.formats : [#<Mime::Type:0x000055a84d9cb080 @synonyms=["application/xhtml+xml"], @symbol=:html, @string="text/html", @hash=-4588311254812961647>]
• action_dispatch.request.parameters : {"_method"=>"delete", "authenticity_token"=>"KdKxyATQZh7s8F10kMr21maWg/GmSgE5Z6l3RHTejSCiNu73PHVwvXCi8keCivEZp6BGygD/B3eJuy+HTvILwQ==", "controller"=>"people", "action"=>"destroy", "id"=>"5"}
• action_dispatch.request.path_parameters : {:controller=>"people", :action=>"destroy", :id=>"5"}
• action_dispatch.request.query_parameters : {}
• action_dispatch.request.request_parameters : {"_method"=>"delete", "authenticity_token"=>"KdKxyATQZh7s8F10kMr21maWg/GmSgE5Z6l3RHTejSCiNu73PHVwvXCi8keCivEZp6BGygD/B3eJuy+HTvILwQ=="}
• action_dispatch.request_id : b093fdf7-4f62-4f25-bb6e-7fd380fdcc38
• action_dispatch.routes : #ActionDispatch::Routing::RouteSet:0x000055a84f262148
• action_dispatch.secret_key_base : 95a5270ff6a06d1f758eca51379409ca3fb77c09912ecb1713d7adb7875737c70426525062aa9691225c6c47bfa5e5563be4dfc5a8b46e8e8090bf03eae3bf0e
• action_dispatch.secret_token :
• action_dispatch.show_detailed_exceptions : false
• action_dispatch.show_exceptions : true
• action_dispatch.signed_cookie_digest :
• action_dispatch.signed_cookie_salt : signed cookie
• action_dispatch.use_authenticated_cookie_encryption : false
• rack.errors : #IO:0x000055a84c7b97e8
• rack.hijack : #<Proc:0x000055a857056040@/home/www-data/.rvm/gems/ruby-2.4.9/gems/passenger-6.0.4/src/ruby_supportlib/phusion_passenger/rack/thread_handler_extension.rb:84 (lambda)>
• rack.hijack? : true
• rack.input : #PhusionPassenger::Utils::TeeInput:0x000055a857056630
• rack.methodoverride.original_method : POST
• rack.multiprocess : true
• rack.multithread : false
• rack.request.cookie_hash : {"_seek_session"=>"0bfc5c7f585e7c6cada8924f8010b9db"}
• rack.request.cookie_string : _seek_session=0bfc5c7f585e7c6cada8924f8010b9db
• rack.request.form_hash : {"_method"=>"delete", "authenticity_token"=>"KdKxyATQZh7s8F10kMr21maWg/GmSgE5Z6l3RHTejSCiNu73PHVwvXCi8keCivEZp6BGygD/B3eJuy+HTvILwQ=="}
• rack.request.form_input : #PhusionPassenger::Utils::TeeInput:0x000055a857056630
• rack.request.form_vars : [FILTERED]
• rack.request.query_hash : {}
• rack.request.query_string :
• rack.run_once : false
• rack.session : #ActionDispatch::Request::Session:0x000055a857b61840
• rack.session.options : #ActionDispatch::Request::Session::Options:0x000055a857b61778
• rack.session.record : #ActiveRecord::SessionStore::Session:0x000055a8578fef58
• rack.tempfiles : []
• rack.url_scheme : https
• rack.version : [1, 2]

---

Backtrace:

(eval):2:in post' app/controllers/people_controller.rb:206:in destroy'
app/controllers/application_controller.rb:43:in block in with_current_user' app/models/user.rb:252:in with_current_user'
app/controllers/application_controller.rb:42:in `with_current_user'

---

Data:

• data: {:user=>
  {:id=>1,
  :login=>"seek2admin",
  :created_at=>Fri, 29 Nov 2019 07:33:39 UTC +00:00},
  :person=>
  {:id=>1,
  :name=>"admin seek2",
  :email=>"seek2@evolbio.mpg.de",
  :created_at=>Fri, 29 Nov 2019 07:34:37 UTC +00:00},
  :site_host=>"https://seek2.evolbio.mpg.de"}

[stuzart]

The problem is caused because the solr engine isn't running, and search is set to be enabled. It is caused by an automatic trigger that needs to delete the record from the search index. Wheres for indexing during changes and creation, we can defer the indexing to a background queue and cope with solr not running, it is not so straight forward for deletion - but is something we need to look into more closely.