rails has_many source
class Project < ActiveRecord::Base belongs_to :portfolio has_one :project_manager has_many :milestones has_and_belongs_to_many :categories end. The project class now has the following methods (and more) to ease the traversal and manipulation of its rel,If you are going to modify the association (rather than just read from it), then it is a good idea to set the :inverse_of option on the source association on the join model. This allows associated records to be built which will automatically create the ap
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 rails has_many source 相關參考資料
Active Record Associations — Ruby on Rails Guides
belongs_to Association Reference; has_one Association Reference; has_many Association Reference; has_and_belongs_to_many Association Reference; Association ...... The :source_type option specifies the... http://guides.rubyonrails.org ActiveRecord::Associations::ClassMethods - Rails API - Ruby on Rails
class Project < ActiveRecord::Base belongs_to :portfolio has_one :project_manager has_many :milestones has_and_belongs_to_many :categories end. The project class now has the following methods (and ... http://api.rubyonrails.org has_many (ActiveRecord::Associations::ClassMethods) - APIdock
If you are going to modify the association (rather than just read from it), then it is a good idea to set the :inverse_of option on the source association on the join model. This allows associated rec... https://apidock.com Rails 4 has_many :through association with :source - Stack Overflow
If you want the list of exercises of the user and at the same, the list of favorite exercise of the user, then I think your join table should just be users_exercises wherein it will list all the exer... https://stackoverflow.com Rails: difference between :source => ?? and :class_name - Stack ...
They are conceptually the same, just need to be different for different uses. :source is used (optionally) to define the associated model name when you're using has_many through ; :class_name is ... https://stackoverflow.com railsassociations.rb at master · railsrails · GitHub
_reflections.keys. super("Could not find the source association(s) #source_reflection_names.collect(&:inspect).to_sentence(two_words_connector: ' or ', last_word_connector: ', or ... https://github.com Ruby on Rails 實戰聖經| ActiveRecord - 資料表關聯
跳到 has_many 的設定 - 可以變更關聯的類別名稱，例如以下新增了 paid_attendees 關聯，和另一個 has_many :attendees 都關聯到同一個attendees table： ... source. 搭配 through 設定使用，當關聯的名稱不一致的時候，需要加上 source 指名是哪一種物件。 class Event < ApplicationRec... https://ihower.tw Understanding :source option of has_onehas_many through of Rails ...
Sometimes, you want to use different names for different associations. If the name you want to use for an association on the model isn't the same as the assocation on the :through model, you can u... https://stackoverflow.com |