Simplify sqlite3 dependency

The comment still stands
https://github.com/rails/rails/blob/9994d38bc6c1a8662e510d26c0e9ca8c24ab1189/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb#L13

Author: pirj

Gemfile

@@ -29,5 +29,4 @@ end
 custom_gemfile = File.expand_path('Gemfile-custom', __dir__)
 eval_gemfile custom_gemfile if File.exist?(custom_gemfile)
 
-eval_gemfile 'Gemfile-sqlite-dependencies'
 eval_gemfile 'Gemfile-rails-dependencies'

Gemfile-rails-dependencies

@@ -11,6 +11,9 @@ def add_net_gems_dependency
   end
 end
 
+# sqlite3 is an optional, unspecified, dependency and Rails 6.0 only supports `~> 1.4`
+gem 'sqlite3', '~> 1.4', platforms: [:ruby]
+
 case version = ENV['RAILS_VERSION'] || (File.exist?(version_file) && File.read(version_file).chomp) || ''
 when /main/
   gem "rails", :git => "https://github.com/rails/rails.git"

Gemfile-sqlite-dependencies

@@ -11,7 +11,6 @@
   'ci_retry_bundle_install.sh'
 )
 function_script_file = File.join(rspec_rails_repo_path, 'script/functions.sh')
-sqlite_initializer = File.join(rspec_rails_repo_path, "example_app_generator/config/initializers/sqlite3_fix.rb")
 
 in_root do
   prepend_to_file "Rakefile", "require 'active_support/all'"
@@ -36,23 +35,14 @@
     EOT
   end
 
-  if Rails::VERSION::STRING >= '6'
-    # sqlite3 is an optional, unspecified, dependency and Rails 6.0 only supports `~> 1.4`
-    gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.4'"
-  else
-    # Similarly, Rails 5.0 only supports '~> 1.3.6'. Rails 5.1-5.2 support '~> 1.3', '>= 1.3.6'
-    gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.3.6'"
-  end
+  # sqlite3 is an optional, unspecified, dependency and Rails 6.0 only supports `~> 1.4`
+  gsub_file "Gemfile", /.*gem..sqlite3.*/, "gem 'sqlite3', '~> 1.4'"
 
   # webdrivers 4 up until 4.3.0 don't specify `required_ruby_version`, but contain
   # Ruby 2.2-incompatible syntax (safe navigation).
   # That basically means we use pre-4.0 for Ruby 2.2, and 4.3+ for newer Rubies.
   gsub_file "Gemfile", /.*chromedriver-helper.*/, "gem 'webdrivers', '!= 4.0.0', '!= 4.0.1', '!= 4.1.0', '!= 4.1.1', '!= 4.1.2', '!= 4.1.3', '!= 4.2.0'"
 
-  if Rails::VERSION::STRING < '6'
-    copy_file sqlite_initializer, 'config/initializers/sqlite3_fix.rb'
-  end
-
   if RUBY_ENGINE == "jruby"
     gsub_file "Gemfile", /.*jdbc.*/, ''
   end

example_app_generator/config/initializers/sqlite3_fix.rb

@@ -20,7 +20,6 @@
   # Those Gemfiles carefully pick the right versions depending on
   # settings in the ENV, `.rails-version` and `maintenance-branch`.
   Dir.chdir('..') do
-    eval_gemfile 'Gemfile-sqlite-dependencies'
     # This Gemfile expects `maintenance-branch` file to be present
     # in the current directory.
     eval_gemfile 'Gemfile-rspec-dependencies'

example_app_generator/generate_app.rb

@@ -20,7 +20,6 @@
   # Those Gemfiles carefully pick the right versions depending on
   # settings in the ENV, `.rails-version` and `maintenance-branch`.
   Dir.chdir('..') do
-    eval_gemfile 'Gemfile-sqlite-dependencies'
     # This Gemfile expects `maintenance-branch` file to be present
     # in the current directory.
     eval_gemfile 'Gemfile-rspec-dependencies'