Updated rubocop + fixed issues

Author: wollistik

acts_as_recursive_tree.gemspec

@@ -16,7 +16,8 @@ Gem::Specification.new do |spec|
   spec.license               = 'MIT'
   spec.metadata              = {
     'bug_tracker_uri' => 'https://github.com/1and1/acts_as_recursive_tree/issues',
-    'changelog_uri' => 'https://github.com/1and1/acts_as_recursive_tree/blob/main/CHANGELOG.md'
+    'changelog_uri' => 'https://github.com/1and1/acts_as_recursive_tree/blob/main/CHANGELOG.md',
+    'rubygems_mfa_required' => 'true'
   }
   spec.required_ruby_version = '>= 2.5.0'
   spec.files                 = `git ls-files -z`.split("\x0")
@@ -31,9 +32,9 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'database_cleaner', '~> 1.5'
   spec.add_development_dependency 'rake'
   spec.add_development_dependency 'rspec-rails', '>= 3.5'
-  spec.add_development_dependency 'rubocop', '>= 1.8.0'
-  spec.add_development_dependency 'rubocop-rails', '>= 2.9.0'
-  spec.add_development_dependency 'rubocop-rspec', '>= 2.1.0'
+  spec.add_development_dependency 'rubocop', '~> 1.23.0'
+  spec.add_development_dependency 'rubocop-rails', '~> 2.12.0'
+  spec.add_development_dependency 'rubocop-rspec', '~> 2.6.0'
 
   spec.add_development_dependency 'sqlite3', '~> 1.3'
 end

spec/db/database.rb

@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require 'fileutils'
 
 database_folder           = "#{File.dirname(__FILE__)}/../db"

spec/model/node_spec.rb

@@ -24,7 +24,7 @@ def create_tree(max_level, current_level = 0, node = nil)
       expect(@root.children.count).to be(3)
     end
 
-    it 'does not include root node ' do
+    it 'does not include root node' do
       expect(@root.children).not_to include(@root)
     end
   end

spec/values_spec.rb

@@ -72,9 +72,16 @@
     end
 
     context 'Relation' do
-      subject(:value) { described_class.create(relation, OpenStruct.new(primary_key: :id)) }
+      subject(:value) { described_class.create(relation, double) }
 
       let(:relation) { Node.where(name: 'test') }
+      let(:double) do
+        Class.new do
+          def self.primary_key
+            :id
+          end
+        end
+      end
 
       it { is_expected.to be_a ActsAsRecursiveTree::Options::Values::Relation }