搜索在存储数组的列中

Question

在我的表professional_infos表中有一列primary_skill_ids，它存储了特定用户的一组技能。我想列出具有某些特定技能集的所有用户。 例子 -

user1 has primary_skill as ["1","3","5","9","4"] 
user2 has primary_skill as ["1","7","9","4"] 
user3 has primary_skill as ["1","4","11"] 
user3 has primary_skill as ["7","9","4"] 
user4 has primary_skill as ["1","7","9"] 
user5 has primary_skill as ["7","9"] 

现在我要执行像让我所有有任何或全部的技能primary_skill_ids作为用户搜索[“1”，“4]

请帮我写一轨查询到这样做。

我已经做了类似下面的

 wildcard_search = "%#{params[:search_title]}%" 
      # key skills and best in search 
     @key_skills=[] 
    @key_skills.each do | sk | 
    # here I am thinking of looping through the ids and do a where clause on column primary_skill_ids but dont know its good idea 


      end 

Answer 1

在字符串列序列化关系数据违反了关系型数据库的想法 - 这是你有外键列指向其他表。在数据库中使用数组*或字符串类型进行关联是非常糟糕的主意：

• 与包含整数或uiids的索引列相比，搜索字符串的效率非常低。
• 没有外键约束强制引用完整性。
• 它并不是ActiveRecord的工作原理 - 这意味着您将通过与框架对抗来浪费时间。

相反，你要创建一个many-to-many association through a join table：

class User < ApplicationRecord 
    has_many :user_skills 
    has_many :skills, through: :user_skills 
end 

class Skill < ApplicationRecord 
    has_many :user_skills 
    has_many :users, through: :user_skills 
end 

class UserSkill < ApplicationRecord 
    belongs_to :user 
    belongs_to :skill 
end 

在这个例子中，我们使用了一个名为user_skills表加盟两种模式：

create_table "user_skills", force: :cascade do |t| 
    t.integer "user_id" 
    t.integer "skill_id" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
    t.index ["skill_id"], name: "index_user_skills_on_skill_id", using: :btree 
    t.index ["user_id"], name: "index_user_skills_on_user_id", using: :btree 
end 

然后，您可以设置UI控件通过使用收集助手：

# app/views/users/_form.html.erb 
<%= form_for(@user) do |f| %> 
    <%= f.collection_check_boxes :skill_ids, Skill.all, :id, :name %> 
<% end %> 

# app/controllers/users_controller.rb 
class UsersController < ApplicationController 
    # POST /users 
    def create 
    @user = User.new(user_params) 
    if @user.save 
     redirect_to @user 
    else 
     render :new 
    end 
    end 

    # PUT|PATCH /users/:id 
    def update 
    @user = User.find(params[:id]) 
    if @user.update(user_params) 
     redirect_to @user 
    else 
     render :edit 
    end 
    end 

    def user_params 
    params.require(:user) 
      .permit(skill_ids: []) 
    end 
end