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我有以下的模型建立UNIQ /显着成果:通过协会通过配置Rails的
class Tale < ActiveRecord::Base
has_many :tale_culture_joins
has_many :cultures, through: :tale_culture_joins, dependent: :destroy, crud: true, index: true
has_many :tale_purpose_joins
has_many :purposes, through: :tale_purpose_joins, dependent: :destroy, crud: true, index: true
has_many :tale_book_joins
has_many :books, through: :tale_book_joins, dependent: :destroy, crud: true, index: true
has_many :tale_keyword_joins
has_many :keywords, through: :tale_keyword_joins, dependent: :destroy, crud: true, index: true
has_many :tale_character_joins
has_many :characters, through: :tale_character_joins, dependent: :destroy, crud: true, index: true
has_many :tale_moral_joins
has_many :morals, through: :tale_moral_joins, dependent: :destroy, crud: true
has_many :values, through: :morals, index: true
has_many :tale_event_joins
has_many :events, through: :tale_event_joins, dependent: :destroy, crud: true
end
Tale -> Moral -> Value
Tale(1) -> Moral(1,2)
Moral(1) -> Value(1,2)
Moral(2) -> Value(2,3)
Tale(1).values # => [1,2,2,3]
我明白它背后的推理,我可以配置的轨道,不仅恢复,而且查询/累积回报值与uniqs,以便uniq条件传递到SQL查询本身