ActiveRecord::Associations

参考:

ActiveRecord::Associations::ClassMethods | Ruby on Rails API [Official]

rails/associations.rb at v5.2.3 · rails/rails – GitHub

ActiveRecord::Associations::Association

参考:

rails/association.rb at v5.2.3 · rails/rails – GitHub

ActiveRecord::Associations::SingularAssociation

参考:

rails/singular_association.rb at v5.2.3 · rails/rails – GitHub

ActiveRecord::Associations::CollectionAssociation

参考:

rails/collection_association.rb at v5.2.3 · rails/rails – GitHub

ActiveRecord::Associations::Builder::HasOne

参考:

rails/has_one.rb at v5.2.3 · rails/rails – GitHub

ActiveRecord::Associations::Builder::HasMany

参考:

rails/has_many.rb at v5.2.3 · rails/rails – GitHub

ActiveRecord::Associations::Builder::Association

参考:

rails/association.rb at v5.2.3 · rails/rails – GitHub

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