feat: rewrite with clean api

[seuros]

Summary

This PR migrates closure_tree to match the new API patterns from the with_advisory_lock gem, removing global monkey patching and implementing proper multi-database support.

Major Changes

1. Remove Global Monkey Patching

• Removed global injection into ActiveRecord connections
• Now uses ActiveSupport.on_load for specific adapters only
• Advisory lock support is added only to PostgreSQL and MySQL adapters

2. Multi-Database Support

• Added support for running tests with PostgreSQL, MySQL, and SQLite simultaneously
• Created database-specific model base classes (ApplicationRecord, MysqlRecord, SqliteRecord)
• Configured DatabaseCleaner for all three database connections
• Tests can now run against all databases in parallel

3. Advisory Lock Implementation

• Changed from connection-level to model-level advisory locks
• Uses model_class.with_advisory_lock instead of connection.with_advisory_lock
• SQLite models return false for advisory lock support (as expected)
• Advisory lock names use CRC32 hashing to fit MySQL's 64-character limit

4. Test Infrastructure Updates

• Copied Docker Compose configuration from with_advisory_lock
• Moved test models into dummy app structure
• Fixed MySQL connection to use 127.0.0.1 instead of localhost (socket vs TCP)
• Renamed SqliteTag to MemoryTag (SQLite reserves "sqlite_" prefix)
• Updated test helper with proper DatabaseCleaner configuration

5. Code Quality

• Added RuboCop to development dependencies
• Applied RuboCop auto-corrections across the codebase
• Added frozen string literal comments to all Ruby files

Testing

All tests pass with the new multi-database setup:

• PostgreSQL tests use advisory locks
• MySQL tests use advisory locks
• SQLite tests work without advisory locks (as designed)

Breaking Changes

This removes the global monkey patching behavior. Applications relying on connection.with_advisory_lock will need to update to use model.with_advisory_lock instead.

[Copilot]

Pull Request Overview

This PR migrates closure_tree to use a dummy Rails app structure for testing and implements proper multi-database support, removing global monkey patching in favor of the new API patterns from the with_advisory_lock gem. The main changes include creating a standard Rails test environment with database-specific model classes and updating test infrastructure to support concurrent testing across PostgreSQL, MySQL, and SQLite.

Key changes:

• Migrated from standalone test setup to Rails dummy app structure with proper database configuration
• Implemented multi-database support with separate base classes for PostgreSQL, MySQL, and SQLite
• Converted Minitest describe/it syntax to Rails test methods using dynamic method definitions

Reviewed Changes

Copilot reviewed 95 out of 100 changed files in this pull request and generated no comments.

File	Description
test/test_helper.rb	Complete rewrite to use Rails dummy app and configure multi-database testing
test/support/tag_examples.rb	Converted from describe/it to Rails test methods with dynamic definitions
test/dummy/	New Rails dummy application structure with multi-database models and configuration
test/closure_tree/	Updated test files to use new dummy app structure and converted syntax

Comments suppressed due to low confidence (5)

test/support/tag_examples.rb:70

• The test method name has inconsistent spacing. It should be 'test_should_find_tag_by_valid_path' to match the naming pattern of other test methods.

    define_method 'test_should find tag by valid path' do

test/support/tag_examples.rb:76

• The test method name has inconsistent spacing. It should be 'test_adds_children_through_add_child' to match the naming pattern of other test methods.

    define_method 'test_adds children through add_child' do

test/support/tag_examples.rb:89

• The test method name has inconsistent spacing. It should be 'test_adds_children_through_collection' to match the naming pattern of other test methods.

    define_method 'test_adds children through collection' do

test/support/tag_examples.rb:112

• The test method name contains spaces and special characters. It should be 'test_3_tag_collection_create_hierarchy' to follow standard Ruby method naming conventions.

    define_method 'test_3 tag collection.create hierarchy' do

test/support/tag_examples.rb:192

• The test method name contains spaces. It should be 'test_3_tag_explicit_create_hierarchy' to follow standard Ruby method naming conventions.

    define_method 'test_3 tag explicit_create hierarchy' do