RSpec導入後_bin/rspecを実行するとundefined method `config' for nil:NilClass (NoMethodError)がでる

Question

■困っていること
次のエラーの解決方法がわからずに困っています。
undefined method "config" for nil:NilClass (NoMethodError)

■環境
cloud9
ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
Rails 5.2.3

$ sqlite3 -version
3.7.17 2013-05-20 00:56:22 118a3b35693b134d56ebd780123b7fd6f1497668

■これまでにやっていたこと
RSpecをセットアップしたのち $ bin/rspecを実行すると以下のエラーが出ました。

ec2-user:~/environment/InstaClone (develop_0618_RSpec) $ bin/rspec
DEPRECATION WARNING: Leaving `ActiveRecord::ConnectionAdapters::SQLite3Adapter.represent_boolean_as_integer`
set to false is deprecated. SQLite databases have used 't' and 'f' to serialize
boolean values and must have old data converted to 1 and 0 (its native boolean
serialization) before setting this flag to true. Conversion can be accomplished
by setting up a rake task which runs


  ExampleModel.where("boolean_column = 't'").update_all(boolean_column: 1)
  ExampleModel.where("boolean_column = 'f'").update_all(boolean_column: 0)


for all models and all boolean columns, after which the flag must be set to
true by adding the following to your application.rb file:


  Rails.application.config.active_record.sqlite3.represent_boolean_as_integer = true
 (called from instance_eval at /home/ec2-user/environment/InstaClone/vendor/bundler/ruby/2.6.0/gems/activesupport-5.2.3/lib/active_support/lazy_load_hooks.rb:71)
Running via Spring preloader in process 6294
No examples found.


Finished in 0.00041 seconds (files took 0.22336 seconds to load)
0 examples, 0 failures

エラーの内容を読むに、"ActiveRecord::ConnectionAdapters::SQLite3Adapter.represent_boolean_as_integerをfalseに設定するのは非推奨です"とのことだったので、
以下のサイトを参考に、application.rbに以下設定を追加してこのフラグをtrueに設定しました。
<参考サイト>
Rails.application.config.active_record.sqlite3.represent_boolean_as_integer = true

すると次のエラーが表示され、対応方法がわからずに悩んでいます。

ec2-user:~/environment/InstaClone (develop_0618_RSpec) $ bin/rspec
/home/ec2-user/environment/InstaClone/config/application.rb:10:in `<top (required)>': undefined method `config' for nil:NilClass (NoMethodError)
        from /home/ec2-user/environment/InstaClone/vendor/bundler/ruby/2.6.0/gems/spring-2.0.2/lib/spring/application.rb:92:in `require'
        from /home/ec2-user/environment/InstaClone/vendor/bundler/ruby/2.6.0/gems/spring-2.0.2/lib/spring/application.rb:92:in `preload'
        from /home/ec2-user/environment/InstaClone/vendor/bundler/ruby/2.6.0/gems/spring-2.0.2/lib/spring/application.rb:153:in `serve'
        from /home/ec2-user/environment/InstaClone/vendor/bundler/ruby/2.6.0/gems/spring-2.0.2/lib/spring/application.rb:141:in `block in run'
        from /home/ec2-user/environment/InstaClone/vendor/bundler/ruby/2.6.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `loop'
        from /home/ec2-user/environment/InstaClone/vendor/bundler/ruby/2.6.0/gems/spring-2.0.2/lib/spring/application.rb:135:in `run'
        from /home/ec2-user/environment/InstaClone/vendor/bundler/ruby/2.6.0/gems/spring-2.0.2/lib/spring/application/boot.rb:19:in `<top (required)>'
        from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from /home/ec2-user/.rvm/rubies/ruby-2.6.3/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
        from -e:1:in `<main>'

application.rbの設定方法が間違っているのでしょうか？
詳細をご存じの方、お力添え頂けますと幸いです。
宜しくお願いします。m(_ _)m

[20190620_追記]

application.rb

====
require_relative 'boot'
require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

#対策：DEPRECATION WARNING: Leaving `ActiveRecord::ConnectionAdapters::SQLite3Adapter.represent_boolean_as_integer`set to false is deprecated.
Rails.application.config.active_record.sqlite3.represent_boolean_as_integer = true

module InstaClone
  class Application < Rails::Application
    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration should go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded.
    config.generators do |g|
      g.test_framework :rspec,
      fixtures: false,
      view_specs: false,
      helper_specs: false,
      routing_specs: false
    end
  end
end

Comments

[suama]

/InstaClone/config/application.rb:10 とエラーメッセージにあるので、おそらく追加された行のところではないでしょうか？
書き方をちょっと間違えているのかな？という気がします。

さしつかえなければapplication.rbを貼って追記いただけるといいと思います。

[napoano365]

suama様
コメントありがとうございます。application.rbの内容は以下の記述となっております。
いかがでしょうか…。
```application.rb
require_relative 'boot'
require 'rails/all'

# Require the gems listed in Gemfile, including any gems
# you've limited to :test, :development, or :production.
Bundler.require(*Rails.groups)

#対策：DEPRECATION WARNING: Leaving `ActiveRecord::ConnectionAdapters::SQLite3Adapter.represent_boolean_as_integer`set to false is deprecated.
Rails.application.config.active_record.sqlite3.represent_boolean_as_integer = true

module InstaClone
class Application < Rails::Application
# Settings in config/environments/* take precedence over those specified here.
# Application configuration should go into files in config/initializers
# -- all .rb files in that directory are automatically loaded.
config.generators do |g|
g.test_framework :rspec,
fixtures: false,
view_specs: false,
helper_specs: false,
routing_specs: false
end
end
end

```

[suama]

ありがとうございます！
回答いただいているように、設定は、 class Application ....end の中に書くと良いと思います！

Answer 1

以下の場所に追加してください。

module InstaClone
  class Application < Rails::Application
    ...
    config.active_record.sqlite3.represent_boolean_as_integer = true
  end
end