如何设置关联以使用字符串foreign_key正确设置has_one?
class Pharmaceutic < ActiveRecord::Base
has_one :pharmaceutic_group, foreign_key: "code"
end
class PharmaceuticGroup < ActiveRecord::Base
belongs_to :pharmaceutic, primary_key: 'code'
end
>> 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: string)
>> PharmaceuticGroup
=> PharmaceuticGroup(id: integer, code: string, name: string)
例如,当: Pharmaceutic 有 group_code 时:aaa
PharmaceuticGroup 的代码为:aaa
我想得到Pharmaceutic.last.pharmaceutic_group.name => 'AAA group name'
我想你应该使用Pharmaceutic belongs_to :pharmaceutic_group
and PharmaceuticGroup has_many :pharmaceutics
, 像这样:
class Pharmaceutic < ActiveRecord::Base
belongs_to :pharmaceutic_group, foreign_key: :group_code, primary_key: :code
end
class PharmaceuticGroup < ActiveRecord::Base
has_many :pharmaceutics, foreign_key: :group_code, primary_key: :code
end
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)