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Tracking mentions began in Dec 2020.
ransack VS Searchkick - a user suggested alternative
2 projects | 12 Aug 2021
Airtable-like table filtering
3 projects | /r/rails | 24 Mar 2021
I use ransack for this and find it very powerful and flexible without the need to rely on complex JS.
An Unofficial Active Admin Guide
First of all, you should take a look at Active Admin's documentation regarding filters. You can continue your overview with the official README and wiki, where, among other things, you can find view-helpers to create custom search forms.
For especially complicated cases, you can consider learning how to create custom predicates and Ransackers - extensions that convert parameters directly into Arel (internal library ActiveRecord, used to build SQL queries).
The postfix _cont is one of the many predicates available in Ransack. Predicates determine which SQL query is to be generated for search. You can read more about all available predicates in the official wiki.
What are some alternatives?
pg_search - pg_search builds ActiveRecord named scopes that take advantage of PostgreSQL’s full text search
Elasticsearch Rails - Elasticsearch integrations for ActiveModel/Record and Ruby on Rails
Searchkick - Intelligent search made easy
elasticsearch-ruby - Ruby integrations for Elasticsearch
Sunspot - Solr-powered search for Ruby objects
active-date-range - Powerful DateRanges for Ruby and ActiveSupport
SearchCop - Search engine like fulltext query support for ActiveRecord
has_scope - Map incoming controller parameters to named scopes in your resources
Thinking Sphinx - Sphinx/Manticore plugin for ActiveRecord/Rails
textacular - Textacular exposes full text search capabilities from PostgreSQL, and allows you to declare full text indexes. Textacular will extend ActiveRecord with named_scope methods making searching easy and fun!
Mongoid Search - Simple full text search for Mongoid ORM
scoped_search - Easily search you ActiveRecord models with a simple query language that converts to SQL.