Rails - NoMethodError: undefinierte Methode `each 'für Nil: NilClass auf Model.find_by

Question

Dieser Fehler tritt nur bei einem Rake auf und nicht bei der Ausführung in der Rails-Konsole.

Hier ist der Code, der abstürzt:

task upload_activities: :environment do 
    include GoogleHelper 
    file = 'upload/things_to_do_activities_upload_v1.csv' 
    content = File.read(file) 
    csv = CSV.parse(content, headers: true) 
    puts 'Parsed CSV successfully' 
    puts csv[0].to_hash # This works 

    csv.each do |row| 
     puts "1" # this is output 
     guide = ThingsToDoGuide.find_by(city_id: 4321) # crashes here 
     puts "2" 
     .... 

Wenn die Harke läuft, gibt die Konsole alles, bis die Linie ThingsToDoGuide.find_by(city_id: 4321).

Ich kann die gleiche Linie in Schienen-Konsole laufen und es funktioniert gut.

Der Fehlertext ist:

rails aborted! 
NoMethodError: undefined method `each' for nil:NilClass 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/httparty-0.15.5/lib/httparty/module_inheritable_attributes.rb:38:in `inherited' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activerecord-5.0.4/lib/active_record/associations/collection_proxy.rb:30:in `<module:Associations>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activerecord-5.0.4/lib/active_record/associations/collection_proxy.rb:2:in `<module:ActiveRecord>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activerecord-5.0.4/lib/active_record/associations/collection_proxy.rb:1:in `<top (required)>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `require' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `block in require' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:257:in `block in load_dependency' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:662:in `new_constants_in' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:257:in `load_dependency' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `require' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/will_paginate-3.1.6/lib/will_paginate/active_record.rb:244:in `<module:ActiveRecord>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/will_paginate-3.1.6/lib/will_paginate/active_record.rb:18:in `<module:WillPaginate>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/will_paginate-3.1.6/lib/will_paginate/active_record.rb:6:in `<top (required)>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `require' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `block in require' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:257:in `block in load_dependency' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:662:in `new_constants_in' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:257:in `load_dependency' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `require' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/will_paginate-3.1.6/lib/will_paginate/railtie.rb:10:in `block (2 levels) in <class:Railtie>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/lazy_load_hooks.rb:43:in `instance_eval' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/lazy_load_hooks.rb:43:in `execute_hook' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/lazy_load_hooks.rb:50:in `block in run_load_hooks' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/lazy_load_hooks.rb:49:in `each' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/lazy_load_hooks.rb:49:in `run_load_hooks' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activerecord-5.0.4/lib/active_record/base.rb:324:in `<module:ActiveRecord>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activerecord-5.0.4/lib/active_record/base.rb:24:in `<top (required)>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `require' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `block in require' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:257:in `block in load_dependency' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:662:in `new_constants_in' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:257:in `load_dependency' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:293:in `require' 
/Users/Calvino/dev/triphappy/app/models/application_record.rb:3:in `<top (required)>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:477:in `load' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:477:in `block in load_file' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:662:in `new_constants_in' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:476:in `load_file' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:375:in `block in require_or_load' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:37:in `block in load_interlock' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies/interlock.rb:12:in `block in loading' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/concurrency/share_lock.rb:150:in `exclusive' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies/interlock.rb:11:in `loading' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:37:in `load_interlock' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:358:in `require_or_load' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:511:in `load_missing_constant' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:203:in `const_missing' 
/Users/Calvino/dev/triphappy/app/models/things_to_do_guide.rb:1:in `<top (required)>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:477:in `load' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:477:in `block in load_file' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:662:in `new_constants_in' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:476:in `load_file' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:375:in `block in require_or_load' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:37:in `block in load_interlock' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies/interlock.rb:12:in `block in loading' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/concurrency/share_lock.rb:150:in `exclusive' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies/interlock.rb:11:in `loading' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:37:in `load_interlock' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:358:in `require_or_load' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:511:in `load_missing_constant' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/activesupport-5.0.4/lib/active_support/dependencies.rb:203:in `const_missing' 
/Users/Calvino/dev/triphappy/lib/tasks/things_to_do.rake:81:in `block (3 levels) in <top (required)>' 
/Users/Calvino/dev/triphappy/lib/tasks/things_to_do.rake:76:in `block (2 levels) in <top (required)>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/railties-5.0.4/lib/rails/commands/rake_proxy.rb:14:in `block in run_rake_task' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/railties-5.0.4/lib/rails/commands/rake_proxy.rb:11:in `run_rake_task' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/railties-5.0.4/lib/rails/commands/commands_tasks.rb:51:in `run_command!' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/railties-5.0.4/lib/rails/commands.rb:18:in `<top (required)>' 
/Users/Calvino/dev/triphappy/bin/rails:9:in `require' 
/Users/Calvino/dev/triphappy/bin/rails:9:in `<top (required)>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `load' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client/rails.rb:28:in `call' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client/command.rb:7:in `call' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/client.rb:30:in `run' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/bin/spring:49:in `<top (required)>' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `load' 
/Users/Calvino/.rvm/gems/ruby-2.4.1/gems/spring-2.0.2/lib/spring/binstub.rb:31:in `<top (required)>' 
/Users/Calvino/dev/triphappy/bin/spring:15:in `require' 
/Users/Calvino/dev/triphappy/bin/spring:15:in `<top (required)>' 
bin/rails:3:in `load' 
bin/rails:3:in `<main>' 
Tasks: TOP => things_to_do:upload_activities 
(See full trace by running task with --trace) 

Ich dachte, ein Problem mit dem Modell gibt es, aber es ist völlig leer.

class ThingsToDoGuide < ApplicationRecord 

end 

Irgendwelche Gedanken?

Answer 1

Dies sieht aus wie ein Problem mit dem HTTParty-Juwel, nicht Rails. Wenn Sie die Methode inherited in Zeile 38 von httparty/lib/module_inheritable_attributes.rb verwenden, wie von der Stack-Ablaufverfolgung vorgeschlagen, wird die Methode each für eine Instanzvariable aufgerufen. Diese Instanzvariable muss in diesem Zusammenhang aus irgendeinem Grund nil sein. Sie könnten erwägen, ein Problem im Repo zu öffnen.

https://github.com/jnunemaker/httparty/blob/master/lib/httparty/module_inheritable_attributes.rb#L38