[WIP] Make searches chainable using and/or

[Copilot]

Implementing chainable and/or methods for Ransack searches

Analysis

The issue requests adding chainable methods like search_parents.or(search_children) to make merging searches more intuitive. Currently, users need to:

1. Create a shared context manually
2. Pass it to all searches
3. Use the visitor pattern to extract and combine conditions

Plan

• Analyze current codebase and understand the problem
• Add and and or methods to the Search class
• Create ChainedSearch class to handle combination of searches
• Implement proper result evaluation using context's evaluation method
• Add comprehensive tests for the new functionality
• Update documentation with examples of the new chainable API

Implementation Details

Core Changes

1. Added and() and or() methods to Search class - These return a new ChainedSearch instance
2. Created ChainedSearch class - Handles combination of multiple searches with proper context sharing
3. Implemented proper evaluation - Uses the context's evaluation method to handle joins and conditions correctly
4. Updated documentation - Added clear examples showing the new chainable API vs manual approach

Key Features

• Chainable operations: search1.and(search2).or(search3) works correctly
• Automatic context sharing: Searches are automatically updated to use shared contexts
• Proper SQL generation: AND/OR operations generate correct SQL with proper grouping
• Backward compatibility: Existing search functionality remains unchanged

API Examples

Simple OR operation:

search_parents = Person.ransack(parent_name_eq: "A")
search_children = Person.ransack(children_name_eq: "B")
result = search_parents.or(search_children).result

Chained operations:

search1.or(search2).or(search3).result

Mixed AND/OR:

search1.and(search2).or(search3).result

Test Results

✅ Basic AND operations: search1.and(search2)
✅ Basic OR operations: search1.or(search2)
✅ Chained operations: search1.or(search2).or(search3)
✅ Mixed operations: search1.and(search2).or(search3)
✅ Proper SQL generation with correct grouping
✅ Comprehensive test suite added
✅ Documentation updated with examples

The implementation successfully addresses the core issue by providing an intuitive chainable API that handles context sharing automatically, making search combination much simpler for users.

Fixes #417

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[scarroll32]

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