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Schema-free, structured storage inside a Relational Database Management System (RDBMS). Use a VARCHAR, TEXT, CLOB, BLOB, or BINARY column in your schema to store structured data in JSON, while still letting you run validations against that data, build methods on top of it, and automatically delegate it to your models. Far more powerful than ActiveRecord's built-in serialization mechanism, flex_columns gives you the freedom of databases without schemas inside a proven RDBMS.

• Why use flex_columns? What does it do?
• What flex_columns is NOT good for
• Introduction: installation, usage, migrating existing JSON columns
• Data Control: using validations, using "types", ways you can access data, column compression, JSON aliases, unknown JSON keys, column NULLability, when JSON is written, Change Detection
• Method Semantics: defining custom methods, overriding methods, controlling method delegation, making methods private, including columns across tables
• API: bulk operations, notifications
• Support Matrix, Running Specs