Tag: 关联

如何在Rails 4中设置自定义字符串外键？

如何使用string foreign_key设置关联以正确设置has_one？ class Pharmaceutic < ActiveRecord::Base has_one :pharmaceutic_group, foreign_key: "code" end class PharmaceuticGroup > Pharmaceutic.last.pharmaceutic_group Pharmaceutic Load (0.3ms) SELECT `pharmaceutics`.* FROM `pharmaceutics` ORDER BY `pharmaceutics`.`id` DESC LIMIT 1 PharmaceuticGroup Load (0.3ms) SELECT `pharmaceutic_groups`.* FROM `pharmaceutic_groups` WHERE `pharmaceutic_groups`.`code` = 2 ORDER BY `pharmaceutic_groups`.`id` ASC LIMIT 1 => nil >> Pharmaceutic => Pharmaceutic(id: integer, package_type: integer, group_code: […]