ciscolive (ciscolive)

ActiveRecord 数据分组和连表查询

ciscolive — Mon, 26 Jul 2021 12:34:49 +0800

需求场景：查询网络交换机端口（关联物理线路）的带宽使用情况，体现带宽利用率和峰值。数据逻辑：多台设备接入不同运营商的专线，具体到每条线路存在进出方向的带宽利用率。需要基于交换机和物理接口分组输出相关的数据，数据要绑定到具体的设备接口，基于物理设备聚合数据。联结关系：host_item ->(has_many) host_histories, host_histories ->(belongs_to) host_item；

HostItem.group(:hostname).group(:iface, :id).having("descr like ?", "%peng%").order(:iface).as_json
  HostItem Load (1.7ms)  SELECT "host_items".* FROM "host_items" GROUP BY "host_items"."hostname", "host_items"."iface", "host_items"."id" HAVING (descr like '%peng%') ORDER BY "host_items"."iface" ASC
=> [{"id"=>39,
  "hostname"=>"SZX1-SW7",
  "ip"=>"10.250.8.251",
  "host_id"=>15855,
  "iface_id"=>9,
  "iface"=>"GigabitEthernet1/0/9",
  "descr"=>"UPSTREAM:100M_Dr.peng",
  "snmp_oid"=>"1.3.6.1.2.1.31.1.1.1.6.9",
  "ref_bandwidth"=>100,
  "created_at"=>"2021-07-26T11:37:48.826+08:00",
  "updated_at"=>"2021-07-26T11:37:48.826+08:00"},
 {"id"=>40,
  "hostname"=>"SZX1-SW7",
  "ip"=>"10.250.8.251",
  "host_id"=>15855,
  "iface_id"=>9,
  "iface"=>"GigabitEthernet1/0/9",
  "descr"=>"UPSTREAM:100M_Dr.peng",
  "snmp_oid"=>"1.3.6.1.2.1.31.1.1.1.10.9",
  "ref_bandwidth"=>100,
  "created_at"=>"2021-07-26T11:37:48.829+08:00",
  "updated_at"=>"2021-07-26T11:37:48.829+08:00"}]

# 查询出某接口特定方向的数据
 HostItem.first.host_histories
  HostItem Load (1.3ms)  SELECT "host_items".* FROM "host_items" ORDER BY "host_items"."id" ASC LIMIT $1  [["LIMIT", 1]]
  HostHistory Load (0.8ms)  SELECT "host_histories".* FROM "host_histories" WHERE "host_histories"."host_item_id" = $1  [["host_item_id", 35]]
=> [#<HostHistory:0x0000559decaeeba8
  id: 33,
  min_value: 63730696,
  max_value: 349566248,
  avg_value: 197222665,
  avg_utilization: 0.3944453304,
  max_utilization: 0.699132496,
  created_at: Mon, 26 Jul 2021 11:37:48.799527000 CST +08:00,
  updated_at: Mon, 26 Jul 2021 11:37:48.799527000 CST +08:00,
  host_item_id: 35>]

折腾半天，还是没想明白怎么通过 active_model 查询出上面的数据结构，麻烦大佬们帮忙看下，谢谢。

期望输出的数据结构：

{
  hostname: "HOST_A",
  interface eth1 : {
    in: {avg:100}
    out: {avg:200}
 }
}

JSON SERIALIZER 使用场景

ciscolive — Thu, 22 Jul 2021 12:43:06 +0800

最近在学习 RAILS，发现大家会用到 SERALIZERS。查看官方文档有 ActiveModel::Serialization 已实现 as_json, serailizer_hash 这些功能，也有类似的 GEM 模块，有人指点下为什么需要用到序列化的外部模块吗？

jsonapi-rb is a highly performant and modular JSON:API-only implementation. There's a vibrant community around it that has produced projects such as JSON:API Suite.
fast_jsonapi is a lightning fast JSON:API serializer for Ruby Objects.
jsonapi-resources is a popular resource-focused framework for implementing JSON:API servers.
blueprinter is a fast, declarative, and API spec agnostic serializer that uses composable views to reduce duplication. From your friends at Procore.

[不懂就问] Rails 父子关系查询

ciscolive — Mon, 28 Jun 2021 16:10:07 +0800

大佬们，最近想通过 SQL 语句实现一个简单的树结构查询功能。苦于 SQL 不熟，希望大佬们指点。

class CreateDeviceTrees < ActiveRecord::Migration[6.1]
  def change
    create_table :device_trees do |t|
      t.numeric :pid
      t.numeric :sub_count
      t.string :name, null: false
      t.boolean :enabled, default: false
      t.numeric :tree_sort, null: false, default: 999

      t.timestamps
    end
  end
end

当前 SQL 的字段

想要实现的数据结构范例：

【有偿】实现 RAILS_API 对接开源的 VUE 前端

ciscolive — Thu, 17 Jun 2021 20:51:52 +0800

各位大佬，有人得闲帮忙实现 RAILS 后台 API 接口对接 GITHUB 上的一个开源前端框架吗？前端地址：https://github.com/elunez/eladmin-web，希望复用里面的逻辑。不知道实现起来需要多久，不知道有大佬帮忙看下不

[RUBY 新手] 有关面向对象的疑问

ciscolive — Tue, 11 May 2021 20:17:27 +0800

各位前辈，最近在调试 ZABBIX 批量添加主机的脚本，有幸在 RUBYGEMS 发现一个模块部分功能可以直接调用。但没有集成批量添加的方法，于是想自行添加。追加的函数如下：

方法定义在 zabbixapi/classes/hosts.rb下面，需要调用到其他模块的hostgroups.get_id（属于zabbixapi/classes/hostgroups.rb）、templates.get_id_by_name(zabbixapi/classes/templates.rb)方法。直接调用下面方法直接报错，刚学RUBY不久，麻烦指教下，谢谢！

### zabbixapi/classes/hosts.rb class ZabbixApi class Hosts < Basic # The method name used for interacting with Hosts via Zabbix API # # @return [String] def method_name 'host' end

# The id field name used for identifying specific Host objects via Zabbix API # # @return [String] def identify 'host' end

def create_or_update_by_csv(path) CSV.foreach(path) do |host| create_or_update( host: host[0], interfaces: [ { type: 2, main: 1, useip: 1, ip: host[1], dns: "", port: 161, details: { version: 2, community: "{$SNMP_COMMUNITY}" } } ], groups: [ groupid: hostgroups.get_id(name: host[2]) ], templates: [ { templateid: templates.get_id_by_name(name: host[3]) } ], inventory_mode: 1, macros: [ { macro: "{$SNMP_COMMUNITY}", value: host[:community_string] } ] ) end end end

zabbixapi/classes/hostgroups.rb

class ZabbixApi class HostGroups < Basic # The method name used for interacting with HostGroups via Zabbix API # # @return [String] def method_name 'hostgroup' end

# The id field name used for identifying specific HostGroup objects via Zabbix API # # @return [String] def identify 'name' end

# The key field name used for HostGroup objects via Zabbix API # # @return [String] def key 'groupid' end end end

项目地址

https://github.com/express42/zabbixapi