Sto usando ruby '2.3.0' e 'rails', '3.2.22.2'."TypeError: nessuna conversione implicita di nil in String" quando si caricano i risultati desiderosi

Ho bisogno di un piccolo aiuto & spiegazioni su una query che ho fatto. Ecco i miei modelli:

class AssessmentRaw < ActiveRecord::Base 
    belongs_to :session 
    has_many :schedulers, :class_name => 'MailingScheduler', :as => :owner, :dependent => :destroy 
end 

class MailingScheduler < ActiveRecord::Base 
    belongs_to :owner, :polymorphic => true 
end 

class Session < ActiveRecord::Base 
    has_many :assessment_raws, :dependent => :destroy 
end

Voglio recuperare tutti i assessment_raws, e del carico ansiosi le sessioni e mailing_schedulers associati.

1. carico ansiosi solo sessioni

ars = AssessmentRaw.includes(:session).where("sessions.start_at >= ?", 1.year.ago).limit(10)

ars.map { |ar| ar.session.id } => [2877, 2878, 2879, 2880, 2881, 2882, 2883, 2884, 2902, 2903]

`ars.map { |ar| ar.schedulers.try(:size) }` 
    MailingScheduler Load (0.6ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 622 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.6ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 725 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.3ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 771 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.3ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 782 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.3ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 881 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.2ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 996 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.3ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 1087 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.3ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 1155 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.2ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 653 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
    MailingScheduler Load (0.2ms) SELECT "mailing_schedulers".* FROM "mailing_schedulers" WHERE "mailing_schedulers"."owner_id" = 940 AND "mailing_schedulers"."owner_type" = 'AssessmentRaw' 
=> [0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Naturalmente per ottenere il conteggio dei mailing_schedulers, i binari devono interrogare (problema N + 1)

2. sessioni di carico ansiosi e mailing_schedulers

ars = AssessmentRaw.includes(:schedulers,:session).where("sessions.start_at >= ?", 1.year.ago).limit(10)

TypeError: no implicit conversion of nil into String 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/arel-3.0.3/lib/arel.rb:40:in `initialize' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/arel-3.0.3/lib/arel.rb:40:in `new' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/arel-3.0.3/lib/arel.rb:40:in `sql' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/associations/join_helper.rb:47:in `block in sanitize' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/associations/join_helper.rb:45:in `map' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/associations/join_helper.rb:45:in `sanitize' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/associations/join_dependency/join_association.rb:104:in `block in join_to' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/associations/join_dependency/join_association.rb:74:in `each' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/associations/join_dependency/join_association.rb:74:in `each_with_index' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/associations/join_dependency/join_association.rb:74:in `join_to' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/query_methods.rb:370:in `block in build_joins' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/query_methods.rb:369:in `each' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/query_methods.rb:369:in `build_joins' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/query_methods.rb:266:in `build_arel' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/query_methods.rb:260:in `arel' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/finder_methods.rb:259:in `construct_limited_ids_condition' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/finder_methods.rb:243:in `apply_join_dependency' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/finder_methods.rb:232:in `construct_relation_for_association_find' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation/finder_methods.rb:211:in `find_with_associations' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation.rb:171:in `exec_queries' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation.rb:160:in `block in to_a' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/explain.rb:41:in `logging_query_plan' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation.rb:159:in `to_a' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/activerecord-3.2.22.2/lib/active_record/relation.rb:498:in `inspect' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/railties-3.2.22.2/lib/rails/commands/console.rb:47:in `start' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/railties-3.2.22.2/lib/rails/commands/console.rb:8:in `start' 
    from /Users/oim/.rbenv/versions/2.3.0/gemsets/project-gems/gems/railties-3.2.22.2/lib/rails/commands.rb:41:in `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>'irb(main):064:0>

ahi. Penso di aver bisogno di un LEFT OUTER JOIN qui perché tutti assessment_raws non ha mailing_schedulers, giusto?

Qualsiasi aiuto apprezzato.

fonte

2016-05-01 fro_oo

'includes' gestisce quando non ci sono righe associate. Cosa succede quando usi Ruby 2.2.5 o 2.3.1? Rails 3.2.22.1 non è stato certificato contro Ruby 2.3. * (È end-of-lifed) e 2.3.0 aveva alcuni bug, quindi ci sono un paio di possibili ragioni per cui questo potrebbe essere un bug. –

Ho! Puoi dirmi dove posso trovare maggiori informazioni sull'ultima versione di Ruby da utilizzare con Rails 3.2.22.1? Ho così tanti problemi con la mia app (mem bloat, mem leak) su Heroku ... potrebbe essere collegata alla versione ruby che uso? –

Questo dice che Rails 3.2.22 funziona con Ruby 2.2: http://weblog.rubyonrails.org/2015/6/16/Rails-3-2-22-4-1-11-and-4-2-2 -have-been-released-and-more/Da allora sono state rilasciate due versioni di Rails 3.2, ma si trattava di correzioni di sicurezza che non dicevano nulla sul supporto aggiuntivo di Ruby. –

Questo problema si verifica a causa di una modifica apportata in Ruby 2.3 dove Hash risponde ora a to_proc che confonde il metodo interpolate. Vedi questa segnalazione di bug per maggiori dettagli: https://github.com/rails/rails/issues/25010. Si noti inoltre che è stata menzionata una soluzione alternativa che ha risolto il problema per me, ma se non si è sicuri di non utilizzare il nuovo to_proc potrebbe essere potenzialmente pericoloso.

cosa ha funzionato per me: ho aggiunto la patch scimmia suggerito (come illustrato di seguito) alla parte superiore del mio config/application.rb

class Hash 
    undef_method :to_proc if self.method_defined?(:to_proc) 
end

fonte

2016-06-02 20:29:34 neuronaut

"TypeError: nessuna conversione implicita di nil in String" quando si caricano i risultati desiderosi

1. carico ansiosi solo sessioni

2. sessioni di carico ansiosi e mailing_schedulers

risposta

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