如何在Rails的单个列中插入或存储多个ID？

问题描述

如何将多个ID插入或保存为逗号分隔的（例如（2,5,8,10）值）在数据库中的多列关系中？我正在使用主动管理员进行资源管理。

How can I insert or save multiple ids as comma separated e.g (2,5,8,10) values in single column in database for many to many relationship? I am using active admin for resource management.

推荐答案

has_many：through关联

The has_many :through Association

has_many：through关联通常用于与另一个模型建立多对多连接。这种关联表明，通过进行第三个模型，可以将声明模型与另一个模型的零个或多个实例匹配。例如，考虑一种医疗实践，患者要预约看医生。相关的协会声明可能看起来像这样

A has_many :through association is often used to set up a many-to-many connection with another model. This association indicates that the declaring model can be matched with zero or more instances of another model by proceeding through a third model. For example, consider a medical practice where patients make appointments to see physicians. The relevant association declarations could look like this

class Physician < ApplicationRecord
  has_many :appointments
  has_many :patients, through: :appointments
end

class Appointment < ApplicationRecord
  belongs_to :physician
  belongs_to :patient
end

class Patient < ApplicationRecord
  has_many :appointments
  has_many :physicians, through: :appointments
end

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