remove rails 6 support

Appraisals

@@ -1,15 +1,8 @@
 # frozen_string_literal: true
 
-appraise 'rails_6.1' do
-  gem 'rails', '~> 6.1'
-  gem 'rspec', '~> 3.10'
-  gem 'rspec-rails', '~> 5.1'
-  gem 'sqlite3', '~> 1.5'
-end
-
 appraise 'rails_7.0' do
   gem 'rails', '~> 7.0'
   gem 'rspec', '~> 3.12'
-  gem 'rspec-rails', '~> 6.0'
+  gem 'rspec-rails', '~> 7.0'
   gem 'sqlite3', '~> 1.5'
 end

README.md

@@ -438,7 +438,6 @@ Tests are written using [RSpec](https://rspec.info/) and are setup to use [Appra
     $ bundle exec appraisal rspec spec/path/to/spec.rb
 
 To run just a particular rails version:
-    $  bundle exec appraisal rails_6.1 rspec
     $  bundle exec appraisal rails_7.0 rspec
 
 ### Console

gemfiles/rails_7.0.gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 gem "rails", "~> 7.0"
 gem "rspec", "~> 3.12"
-gem "rspec-rails", "~> 6.0"
+gem "rspec-rails", "~> 7.0"
 gem "sqlite3", "~> 1.5"
 
 gemspec path: "../"

phi_attrs.gemspec

@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'rails', '>= 6.0.0'
+  spec.add_dependency 'rails', '>= 7.0.0'
   spec.add_dependency 'request_store', '~> 1.4'
 
   spec.add_development_dependency 'appraisal'

spec/dummy/application.rb

@@ -23,8 +23,6 @@ class Application < Rails::Application
     config.paths['log'] = 'tmp/log/development.log'
     config.paths.add 'config/routes.rb', with: "#{APP_ROOT}/config/routes.rb"
 
-    config.active_record.sqlite3.represent_boolean_as_integer = true if Rails.version.match?(/^6.0/)
-
     def require_environment!
       initialize!
     end