query-agent

Create query objects under app/queries that implement a #call method with predefined default relations and safe parameterization. This extracts complex multi-conditional filtering logic from controllers into reusable, composable classes for reporting and analytics dashboards.

The ApplicationQuery pattern structures database queries into dedicated objects with predefined default relations, safe parameterization, includes for N+1 prevention, and a structured call interface. It separates complex multi-conditional filtering logic from controllers into reusable, testable classes.

Prevent N+1 queries in Rails by using query objects that apply includes for eager loading associations within predefined default relations. The ApplicationQuery pattern enforces this efficiency standard, keeping multi-model filtering performant for dashboards and analytics.

The query object pattern works with RSpec by placing testable specs in the spec/ directory. Because query logic is encapsulated in isolated objects with clear call interfaces, you can unit test multi-conditional ActiveRecord filtering independently from controllers and services.

The best way to organize reporting and analytics queries is using the ApplicationQuery pattern to encapsulate them into reusable query objects under app/queries. This enforces includes for N+1 prevention, safe parameterization, and clear separation from business rules.

Use query objects instead of scopes or class methods when dealing with complex multi-conditional filtering across multiple models for reporting and analytics. Query objects provide a structured call interface, safe parameterization, and dedicated specs that prevent controller clutter.