关于协会答案

【问题标题】：About associations关于协会
【发布时间】：2017-03-24 00:29:38
【问题描述】：

我有 3 个模型。业主、财产和承租人。我对租户协会感到困惑，因为在我的房地产系统中，租户可以拥有多个租赁物业。也许 has_many through ？如是。如何实现？

class Proprietor < ApplicationRecord
  has_many :properties, dependent: :destroy
end

class Property < ApplicationRecord
  belongs_to :proprietor
end

class Renter < ApplicationRecord
end

class CreateProprietors < ActiveRecord::Migration[5.0]
  def change
    create_table :proprietors do |t|
      t.string :full_name
      t.string :email
      t.date :birthday
      t.string :social_security
      t.string :doc_id
      t.text :address
      t.string :zip_code

      t.timestamps
    end
  end
end

class CreateProperties < ActiveRecord::Migration[5.0]
  def change
    create_table :properties do |t|
      t.references :proprietor, foreign_key: true
      t.text :address
      t.string :zip_code
      t.integer :rooms
      t.integer :bedrooms
      t.integer :bathrooms
      t.integer :garage
      t.string :price
      t.boolean :published, defalt: false

      t.timestamps
    end
  end
end

class CreateRenters < ActiveRecord::Migration[5.0]
  def change
    create_table :renters do |t|
      t.string :full_name
      t.string :email
      t.date :birthday
      t.string :social_security
      t.string :doc_id

      t.timestamps
    end
  end
end

【问题讨论】：

标签： ruby-on-rails model-associations

【解决方案1】：

我不认为你需要一个 has_many 通过这个（除非房产可以有很多租房者以及租房者有很多房产？）

如果需要如您在问题中所述，这应该是可以实现的：

class Proprietor < ApplicationRecord
  has_many :properties, dependent: :destroy
end

class Property < ApplicationRecord
  belongs_to :proprietor
  belongs_to :renter
end

class Renter < ApplicationRecord
  has_many :properties
end

class CreateProprietors < ActiveRecord::Migration[5.0]
  def change
    create_table :proprietors do |t|
      t.string :full_name
      t.string :email
      t.date :birthday
      t.string :social_security
      t.string :doc_id
      t.text :address
      t.string :zip_code

      t.timestamps
    end
  end
end

class CreateProperties < ActiveRecord::Migration[5.0]
  def change
    create_table :properties do |t|
      t.references :proprietor, foreign_key: true
      t.references :renter, foreign_key: true
      t.text :address
      t.string :zip_code
      t.integer :rooms
      t.integer :bedrooms
      t.integer :bathrooms
      t.integer :garage
      t.string :price
      t.boolean :published, default: false

      t.timestamps
    end
  end
end

class CreateRenters < ActiveRecord::Migration[5.0]
  def change
    create_table :renters do |t|
      t.string :full_name
      t.string :email
      t.date :birthday
      t.string :social_security
      t.string :doc_id

      t.timestamps
    end
  end
end

【讨论】：