Allows the caller to define a queryable collection of elements and the attributes that can be used for querying. Provides the necessary methods to query the collection

Find data in Hashes using dot notation queries

Make logs queryable, just like you would query any other activerecord table

Run explain on all the sql queries rails generates.

Query cache middleware for custom ActiveRecord base classes.

Allows rails/rspec users to test against number of queries on any given action/block

Detecting query result changes

Move query code from ActiveRecord models into query objects, because database query code do not belong in the model.

This gem provides DSL to write custom complex filters for ActiveRecord models

Parse filters (or something else) from pretty human readable query string to hash

Query activerecord models based on sql-like syntax with arbitratily deeply nested conditions

Generate Standard Sql query

Utilities to query data in handy ways.

Search the ITIS Database! (in a very limited fashion)

This gem provides additional functionality on your query objects. It will filter and paginate your query by supplying an option

An opinionated search query parser

If max_query_limit is not specified, this gem will return only 5 result items by default on all sql queries

Match the number of queries performed in any block of code

Query methods extend in rails 4: Asscociation has_many, union, or, like, operators...

This is rails gem which will minimize query for one-to-one, one-to-many database relationships.