rails belongs_to through
跳到 belongs_to Association Reference — In database terms, the belongs_to association says that ... and the link through this object's foreign key will be set ... ,Rails 支援以下六種關聯：. belongs_to; has_one; has_many; has_many :through; has_one :through; has_and_belongs_to_many. ,2018年9月20日 — Suppose I have a belongs_to relationship and the thing it belongs to, belongs in turn to something else. For example, I would like to do: ... ,2012年7月13日 — A belongs_to association cannot have a :through option. You're better off caching the question_id on Choice and adding a unique index to the table (especially because validates_uniqueness_of is prone to race conditions). ,2014年7月31日 — In your Manufacturer model you could have these relations: has_many :machines # You probably already have this one has_many :factories, ... ,2012年2月23日 — Use delegate in the model class. class Team < ActiveRecord::Base belongs_to :division has_many :players delegate :league, to: :division end. ,2017年1月2日 — You could just add a has_many or has_many through to your Appointment model class. Keep in mind that belongs_to association is always on ... ,2014年6月9日 — Structure. Maybe you're complicating this too much class Enrollment belongs_to :course belongs_to :user end. This means you have a join ... ,In the link you gave: Specifies a one-to-one association with another class. This method should only be used if this class contains the foreign key. I think you ...
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 rails belongs_to through 相關參考資料
Active Record Associations — Ruby on Rails Guides
跳到 belongs_to Association Reference — In database terms, the belongs_to association says that ... and the link through this object's foreign key will be set ... https://guides.rubyonrails.org Active Record 關聯— Ruby on Rails 指南
Rails 支援以下六種關聯：. belongs_to; has_one; has_many; has_many :through; has_one :through; has_and_belongs_to_many. https://rails.ruby.tw Belongs_to :through? - Rails - Ruby-Forum
2018年9月20日 — Suppose I have a belongs_to relationship and the thing it belongs to, belongs in turn to something else. For example, I would like to do: ... https://www.ruby-forum.com belongs_to through associations - Stack Overflow
2012年7月13日 — A belongs_to association cannot have a :through option. You're better off caching the question_id on Choice and adding a unique index to the table (especially because validates_uniqu... https://stackoverflow.com Equivalent of belongs_to through in rails model - Stack Overflow
2014年7月31日 — In your Manufacturer model you could have these relations: has_many :machines # You probably already have this one has_many :factories, ... https://stackoverflow.com How do I set up a kind of "belongs_to :through" association ...
2012年2月23日 — Use delegate in the model class. class Team < ActiveRecord::Base belongs_to :division has_many :players delegate :league, to: :division end. https://stackoverflow.com Rails 5: "belongs_to through" kind of association - Stack ...
2017年1月2日 — You could just add a has_many or has_many through to your Appointment model class. Keep in mind that belongs_to association is always on ... https://stackoverflow.com Rails belongs_to through association - Stack Overflow
2014年6月9日 — Structure. Maybe you're complicating this too much class Enrollment belongs_to :course belongs_to :user end. This means you have a join ... https://stackoverflow.com Use through option on a belongs_to ActiveRecord association ...
In the link you gave: Specifies a one-to-one association with another class. This method should only be used if this class contains the foreign key. I think you ... https://stackoverflow.com |