私のrailsアプリケーションでは、複雑なdefault_scopeを持つ特定のモデルが1つあり、このモデルを通過する1つのモデルにhas_many関係を作成しようとしています。残念ながら、：throughモデルのデフォルトのスコープが原因のように見える奇妙なエラーメッセージが表示されています。これが私の設定です：
# == Schema Information
#
# Table name: training_classes
#
# id :integer not null, primary key
# created_at :datetime not null
# updated_at :datetime not null
#
class TrainingClass < ActiveRecord::Base
has_many :meetings, class_name: :ClassMeeting, foreign_key: :class_id, dependent: :destroy, inverse_of: :training_class
has_many :training_records, foreign_key: :class_id, dependent: :destroy, inverse_of: :training_class
scope :with_date, joins("
LEFT OUTER JOIN
(#{ClassMeeting.earliest_dates.to_sql}) as class_meeting
ON class_meeting.class_id = training_classes.id
")
default_scope with_date.order('class_meeting.start_time ASC')
end
# == Schema Information
#
# Table name: training_records
#
# id :integer not null, primary key
# class_id :integer
# created_at :datetime not null
# updated_at :datetime not null
#
class TrainingRecord < ActiveRecord::Base
belongs_to :training_class, foreign_key: :class_id, inverse_of: :training_records
has_many :attendance_records, inverse_of: :training_record, dependent: :destroy
has_many :meetings, class_name: :ClassMeeting, through: :training_class # This doesn't work correctly
end
# == Schema Information
#
# Table name: class_meetings
#
# id :integer not null, primary key
# class_id :integer
# start_time :datetime
# end_time :datetime
# created_at :datetime not null
# updated_at :datetime not null
#
class ClassMeeting < ActiveRecord::Base
belongs_to :training_class, foreign_key: :class_id, inverse_of: :meetings
has_many :attendance_records, class_name: :AttendanceRecord, foreign_key: :meeting_id, dependent: :destroy
has_many :training_records, through: :training_class # This doesn't work correctly
scope :earliest_dates, select('
class_meetings.id,
class_meetings.class_id,
MIN(class_meetings.start_time) as start_time'
).group('class_meetings.class_id').order('class_meetings.start_time DESC')
end
これらの例では、簡単にするためにコードを削除していることに注意してください。これらの3つのモデル間の関係に関連するすべてが無傷であると私はかなり確信しています。また、これらのモデルに関する他のすべては、私のアプリケーションでhas_many :x, through: training_classは問題なく機能します。機能していないのは関係だけです。表示されるエラーメッセージは次のとおりです。
irb(main):004:0> ClassMeeting.first.training_records
ClassMeeting Load (0.0ms) SELECT "class_meetings".* FROM "class_meetings" LIMIT 1
TrainingRecord Load (0.0ms) SELECT "training_records".* FROM "training_records" INNER JOIN "training_classes" ON "training_records"."class_id" = "training_classes"."id" WHERE "training_classes"."id" = 1 ORDER BY class_meeting.start_time ASC
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: class_meeting.start_time: SELECT "training_records".* FROM "training_records" INNER JOIN "training_classes" ON "training_records"."class_id" = "training_classes"."id" WHERE "training_classes"."id" = 1 ORDER BY class_meeting.start_time ASC
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/sqlite3-1.3.6-x86-mingw32/lib/sqlite3/database.rb:91:in `initialize'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/sqlite3-1.3.6-x86-mingw32/lib/sqlite3/database.rb:91:in `new'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/sqlite3-1.3.6-x86-mingw32/lib/sqlite3/database.rb:91:in `prepare'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/sqlite_adapter.rb:246:in `block in exec_query'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/sqlite_adapter.rb:242:in `exec_query'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/sqlite_adapter.rb:467:in `select'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/database_statements.rb:18:in `select_all'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/query_cache.rb:63:in `select_all'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/querying.rb:38:in `block in find_by_sql'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/explain.rb:40:in `logging_query_plan'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/querying.rb:37:in `find_by_sql'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/relation.rb:171:in `exec_queries'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/relation.rb:160:in `block in to_a'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/explain.rb:33:in `logging_query_plan'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/relation.rb:159:in `to_a'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/relation/finder_methods.rb:159:in `all'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/associations/has_many_through_association.rb:173:in `find_target'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/associations/collection_association.rb:333:in `load_target'
from c:in `load_target'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/associations/collection_proxy.rb:87:in `method_missing'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.6/lib/rails/commands/console.rb:47:in `start'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.6/lib/rails/commands/console.rb:8:in `start'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.6/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
と：
irb(main):006:0> TrainingRecord.first.meetings
TrainingRecord Load (0.0ms) SELECT "training_records".* FROM "training_records" LIMIT 1
ClassMeeting Load (0.0ms) SELECT "class_meetings".* FROM "class_meetings" INNER JOIN "training_classes" ON "class_meetings"."class_id" = "training_classes"."id" WHERE "training_classes"."id" = 23 ORDER BY class_meeting.start_time ASC
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: class_meeting.start_time: SELECT "class_meetings".* FROM "class_meetings" INNER JOIN "training_classes" ON "class_meetings"."class_id" = "training_classes"."id" WHERE "training_classes"."id" = 23 ORDER BY class_meeting.start_time ASC
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/sqlite3-1.3.6-x86-mingw32/lib/sqlite3/database.rb:91:in `initialize'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/sqlite3-1.3.6-x86-mingw32/lib/sqlite3/database.rb:91:in `new'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/sqlite3-1.3.6-x86-mingw32/lib/sqlite3/database.rb:91:in `prepare'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/sqlite_adapter.rb:246:in `block in exec_query'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract_adapter.rb:280:in `block in log'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activesupport-3.2.6/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract_adapter.rb:275:in `log'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/sqlite_adapter.rb:242:in `exec_query'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/sqlite_adapter.rb:467:in `select'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/database_statements.rb:18:in `select_all'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/connection_adapters/abstract/query_cache.rb:63:in `select_all'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/querying.rb:38:in `block in find_by_sql'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/explain.rb:40:in `logging_query_plan'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/querying.rb:37:in `find_by_sql'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/relation.rb:171:in `exec_queries'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/relation.rb:160:in `block in to_a'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/explain.rb:33:in `logging_query_plan'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/relation.rb:159:in `to_a'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/relation/finder_methods.rb:159:in `all'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/associations/has_many_through_association.rb:173:in `find_target'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/associations/collection_association.rb:333:in `load_target'
from c:in `load_target'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/activerecord-3.2.6/lib/active_record/associations/collection_proxy.rb:87:in `method_missing'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.6/lib/rails/commands/console.rb:47:in `start'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.6/lib/rails/commands/console.rb:8:in `start'
from c:/RailsInstaller/Ruby1.9.3/lib/ruby/gems/1.9.1/gems/railties-3.2.6/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'irb(main):007:0>
：throughリレーションシップは、それぞれのクエリにのデフォルトスコープのorder('class_meeting.start_time ASC')一部を含んでいるように見えます。TrainingClass私には、これはまったく合理的な振る舞いではないようです。これはRailsのバグですか？：finder_sqlリレーションシップオプションを使用してリレーションシップを機能させることができましたが、それはかなり厄介な解決策のようです。誰かが私がこれを修正する方法について何か考えがありますか？TrainingClass（おそらく、関係にデフォルトのスコープを無視させる方法はありますか？）