Rails konnte die umgekehrte Zuordnung nicht finden in hat viele Relation

Question

Ich habe zwei Modelle (eins zu viele Beziehung zwischen ihnen) in Schienen 5, Man ist ScholarshipGroup und Stipendienmodell mit Admin-Namespace.

ScholarshipGroup Modell:

class Admin::ScholarshipGroup < ApplicationRecord  
    has_many :admin_scholarships, :class_name => 'Admin::Scholarship',inverse_of: :admin_scholarship_group 
end 

und Wissenschaft Modell:

class Admin::Scholarship < ApplicationRecord 
    belongs_to :group, :class_name=> 'Admin::ScholarshipGroup', inverse_of: 'admin_scholarships'  
end 

Ich möchte Daten für alle Stipendien im Rahmen eines ScholarshipGroup benötigen. Aber wenn ich diese Abfrage ausführen von Schienen Konsole:

$ Admin::ScholarshipGroup.first.admin_scholarships.first 

Aber es gibt mir diese Fehlermeldung:

Admin::ScholarshipGroup Load (0.3ms) SELECT "admin_scholarship_groups".* FROM "admin_scholarship_groups" ORDER BY "admin_scholarship_groups"."id" ASC LIMIT ? [["LIMIT", 1]] 
ActiveRecord::InverseOfAssociationNotFoundError: Could not find the inverse association for admin_scholarships (:admin_scholarship_group in Admin::Scholarship) 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activerecord-5.0.0.1/lib/active_record/reflection.rb:202:in `check_validity_of_inverse!' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activerecord-5.0.0.1/lib/active_record/reflection.rb:402:in `check_validity!' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activerecord-5.0.0.1/lib/active_record/associations/association.rb:25:in `initialize' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activerecord-5.0.0.1/lib/active_record/associations.rb:235:in `new' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activerecord-5.0.0.1/lib/active_record/associations.rb:235:in `association' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activerecord-5.0.0.1/lib/active_record/associations/builder/association.rb:111:in `admin_scholarships' 
     from (irb):34 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/railties-5.0.0.1/lib/rails/commands/console.rb:65:in `start' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/railties-5.0.0.1/lib/rails/commands/console_helper.rb:9:in `start' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:78:in `console' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/railties-5.0.0.1/lib/rails/commands/commands_tasks.rb:49:in `run_command!' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/railties-5.0.0.1/lib/rails/commands.rb:18:in `<top (required)>' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `block in require' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:293:in `require' 
     from /home/ubuntu/workspace/bin/rails:9:in `<top (required)>' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `load' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `block in load' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:259:in `load_dependency' 
     from /usr/local/rvm/gems/ruby-2.3.1@college/gems/activesupport-5.0.0.1/lib/active_support/dependencies.rb:287:in `load' 
     from /usr/local/rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
     from /usr/local/rvm/rubies/ruby-2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require' 
     from -e:1:in `<main>' 

Warum diese Art Fehler kehren? Kann mir jemand die Lösung dieses Fehlers vorschlagen?

Answer 1

Sie definierten belongs_to :group in Admin::Scholarship Modell.

können Sie versuchen:

has_many :admin_scholarships, :class_name => 'Admin::Scholarship',inverse_of: :group, foreign_key: 'group_id'