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This is similar to the `disable_joins` option on `has_many :through` associations applied to `has_one :through` associations. When `disable_joins` is set Rails will create 2 or more queries to get associations instead of generating a join. ```ruby class Person belongs_to :dog has_one :veterinarian, through: :dog, disable_joins: true end ``` Then instead of generating join SQL, two queries are used for `@person.veterinarian`: ``` SELECT "dogs"."id" FROM "dogs" WHERE "dogs"."person_id" = ? [["person_id", 1]] SELECT "veterinarians".* FROM "veterinarians" WHERE "veterinarians"."dog_id" = ? [["dog_id", 1]] ``` Co-authored-by: Eileen M. Uchitelle <eileencodes@gmail.com> |
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| rails_guides.rb | ||
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