Mongoidでkeyにドットが含まれるjson形式のデータを格納する際にエラーが発生する

Question

###前提・実現したいこと
Mongoidでkeyにドットが含まれる階層構造のJsonデータを格納したい

###発生している問題・エラーメッセージ
Mongoidを利用してRailsに複数階層ネストしたJsonデータを格納しようと考え、
下記の形で設定しbundle exec rails db:seedを実施するとエラーが発生します。

```b
$ bundle exec rails db:seed
rails aborted!
BSON::String::IllegalKey: '127.0.0.1' is an illegal key in MongoDB. Keys may not start with '$' or contain a '.'.
/es-webui/vender/bundle/ruby/2.3.0/gems/bson-4.3.0.beta/lib/bson/hash.rb:42:in `put_hash'
/es-webui/vender/bundle/ruby/2.3.0/gems/bson-4.3.0.beta/lib/bson/hash.rb:42:in `to_bson'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/protocol/serializers.rb:326:in `serialize'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/protocol/message.rb:241:in `block in serialize_fields'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/protocol/message.rb:229:in `each'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/protocol/message.rb:229:in `serialize_fields'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/protocol/message.rb:125:in `serialize'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/server/connection.rb:229:in `block in write'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/server/connection.rb:228:in `each'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/server/connection.rb:228:in `write'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/server/connection.rb:195:in `deliver'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/server/connection.rb:126:in `block in dispatch'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/monitoring/publishable.rb:47:in `publish_command'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/server/connection.rb:125:in `dispatch'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/operation/write/command/writable.rb:40:in `block in execute'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/server/connection_pool.rb:107:in `with_connection'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/server.rb:250:in `with_connection'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/operation/write/command/writable.rb:39:in `execute'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/operation/write/insert.rb:55:in `execute_write_command'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/operation/write/write_command_enabled.rb:50:in `execute'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/collection.rb:430:in `block (2 levels) in insert_one'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/retryable.rb:106:in `write_with_retry'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/collection.rb:420:in `block in insert_one'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/client.rb:449:in `with_session'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongo-2.5.0.beta/lib/mongo/collection.rb:419:in `insert_one'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/query_cache.rb:182:in `insert_one_with_clear_cache'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/creatable.rb:79:in `insert_as_root'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/creatable.rb:27:in `block in insert'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/creatable.rb:118:in `block (2 levels) in prepare_insert'
/es-webui/vender/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/callbacks.rb:131:in `run_callbacks'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/interceptable.rb:132:in `run_callbacks'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/creatable.rb:117:in `block in prepare_insert'
/es-webui/vender/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/callbacks.rb:97:in `run_callbacks'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/interceptable.rb:132:in `run_callbacks'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/creatable.rb:116:in `prepare_insert'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/creatable.rb:23:in `insert'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/savable.rb:23:in `save'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/creatable.rb:149:in `block in create'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/threaded/lifecycle.rb:161:in `_creating'
/es-webui/vender/bundle/ruby/2.3.0/gems/mongoid-7.0.0.beta/lib/mongoid/persistable/creatable.rb:144:in `create'
/es-webui/db/seeds.rb:19:in `block in <top (required)>'
/es-webui/db/seeds.rb:16:in `each'
/es-webui/db/seeds.rb:16:in `<top (required)>'
/es-webui/vender/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `load'
/es-webui/vender/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `block in load'
/es-webui/vender/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:258:in `load_dependency'
/es-webui/vender/bundle/ruby/2.3.0/gems/activesupport-5.1.4/lib/active_support/dependencies.rb:286:in `load'
/es-webui/vender/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/engine.rb:549:in `load_seed'
/es-webui/vender/bundle/ruby/2.3.0/gems/activerecord-5.1.4/lib/active_record/tasks/database_tasks.rb:270:in `load_seed'
/es-webui/vender/bundle/ruby/2.3.0/gems/activerecord-5.1.4/lib/active_record/railties/databases.rake:184:in `block (2 levels) in <top (required)>'
/es-webui/vender/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/commands/rake/rake_command.rb:21:in `block in perform'
/es-webui/vender/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/commands/rake/rake_command.rb:18:in `perform'
/es-webui/vender/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/command.rb:46:in `invoke'
/es-webui/vender/bundle/ruby/2.3.0/gems/railties-5.1.4/lib/rails/commands.rb:16:in `<top (required)>'
bin/rails:4:in `require'
bin/rails:4:in `<main>'
Tasks: TOP => db:seed
(See full trace by running task with --trace)

###該当のソースコード
ruby
#db/seed.rb
list = [
        "aaa001",
        "aaa002",
        "aaa003",
        "aaa004",
        "aaa005"
      ]

list.each do |l|
  json_path = "db/testdata/#{l}.json"
  json = ActiveSupport::JSON.decode(File.read(json_path))
  Node.create(name: l,snj: json)
end

#models/node.rb
class Node
  include Mongoid::Document
  include Mongoid::Timestamps
  field :name, type: String
  field :snj, type: Hash
end

#a001.json
{
  "name": "aaa001",
　・・・
　"automatic": {
　　"network": {
      "interfaces": {
　　　　　"eth0": {
　　　　　　"addresses": {
            "06:21:E3:AA:8F:10": {
              "family": "lladdr"
            },
・・・

###試したこと
・Web上で検索すると以下の情報がありました
https://jira.mongodb.org/browse/RUBY-1167
Mongoid内部で利用しているMongo　gemが2.3.0の場合、似たようなエラーが発生するとの記載はありますが
、2.3.1で修正されているとのことです。

・mongoidのバージョンアップ（6.2.1→7.0.0beta）
・mongoのバージョンアップ（2.4.3→2.5.0beta)
・bsonのバージョンアップ(4.2.2→4.3.0beta)

上記リンクの回避策となるmongo　gemを2.3.0より低いバージョンにする手法は、Railsのバージョンとの兼ね合いで
難しいとの判断です

また、railsコンソールから直に登録しようと試みても同様のエラーが発生しました
###補足情報(言語/FW/ツール等のバージョンなど)
ruby 2.3.1
rails 5.1.4
mongoid 6.2.1→7.0.0beta
mongo 2.4.3→2.5.0beta

mongoDB 3.4.9

どなたかわかる方、ご教授ください

Answer 1

MongoDB 2.6以降では、ドットが含まれたり、$で始まるフィールド名は使用不可となりました。

https://docs.mongodb.com/master/release-notes/2.6-compatibility/#updates-enforce-field-name-restrictions

Updates no longer support saving field names that contain a dot (.) or a field name that starts with a dollar sign ($).