在 ruby 中搜索多态模型

Question

我有这些型号：

Class Party < ApplicationRecord
  belongs_to :partyable, polymorphic: true
end

Class Person < ApplicationRecord
  has_one :party, as: :partyable, dependent: :destroy
end

Class Organization < ApplicationRecord
  has_one :party, as: :partyable, dependent: : destroy
end

查看这些表格：

class CreatePeople < ActiveRecord::Migration[5.2]
  def change
    create_table :people do |t|
      t.string :first_name
      t.string :last_name, null: false
      t.string :gender
      t.text :notes
      t.timestamps
    end
  end
end

class CreateOrganizations < ActiveRecord::Migration[5.2]
  def change
    create_table :organizations do |t|
      t.string :name, null: false
      t.string :description
      t.text :notes
      t.timestamps
    end
  end
end

class CreateParties < ActiveRecord::Migration[5.2]
  def change
    create_table :parties do |t|
      t.references :partyable, polymorphic: true
      t.text :notes
      t.timestamps
    end
  end
end

现在，我想搜索派对模型和 return 名称中包含给定字符串的派对数组（如果派对是组织）或 last_name（如果派对是一个人）

目前，当我尝试查询我没有成功的人时：

Party.joins("INNER JOIN people ON people.id = parties.partyable_id").select('parties.*,people.last_name').where('last_name like ?', "%Smith%").first

我明白了

ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: last_name: SELECT  parties.*,people.last_name FROM "parties" INNER JOIN people ON people.id = parties.partyable_id WHERE (last_name like '%Smith%') ORDER BY "parties"."id" ASC LIMIT ?

为什么找不到 last_name 列？我能以某种方式改进模型以获得我想要的吗？有人可以给我一个 advice/hint/solution 吗？

Answer 1

好的！典型的打字错误。我输入了 las_name 而不是 last_name。因此，一种有效的解决方案是：

在models/Party.rb

def self.search(search)
  r1 = joins("INNER JOIN people ON people.id = parties.partyable_id").where('last_name like ?', "%#{search}%")
  r2 = joins("INNER JOIN organizations ON organizations.id = parties.partyable_id).where('name like ?', "%#{search}%")
  r = r1 + r2
  r.uniq{|x| x.id}
end

编辑

我找到了更好的解决方案

scope :search, ->(s) {
    joins("LEFT JOIN people ON people.id = parties.partyable_id").
    joins("LEFT JOIN organizations ON organizations.id = parties.partyable_id").
    where(people.last_name LIKE :s OR organizations.name LIKE :s', s: "%#{s}%")
  }

有人可以提供更好的方法吗？

在 ruby 中搜索多态模型

Searching Polymorhic models in ruby

polymorphic-associations

rails-activerecord

ruby-on-rails-5

编辑