By leveraging smart comments in your schema, you can easily use this data throughout your app and make better decisions when logging data, exposing data through endpoints, monitoring data sent elsewhere, or allowing other systems accessing your database to consume the classifications...

Complex documents can be challenging to author, and time-consuming to achieve high levels of internal consistency. This gem offers a Domain Specific Language to embed structured data in a markdown document and then render it into configurable tables. Note: See security implications below.

From within your tests, if you can't understand what's going on, maybe you need to dump your data to your development database and use it from there?

Database Import / Export Tool

A tool that helps you generate data into multiple databases

Datafix provides a generator for documenting and testing database hotfixes

Easy management of database dumps for dev env

Data List Converter is a tool to convert data between different formats.

Uses fastercsv to scan a few lines of a CSV and create a schema with ActiveRecord. It does the actual file load with MySQL LOAD DATA.

A magical extract, transform, load (ETL) library for data integration.

A minimalistic Data Mapper for removing model dependency on Active Record

Dress ActiveRecord models in DataMapper robes

Generates Data Migrations on Migrate style.

Data migrations kit for ActiveRecord and ActiveJob

Data Pitcher throw your pesisted data to Google Spreadsheet.

Converts DBF to modern formats.

Ever found yourself wanting a modest amount of fresh rows from a production database for development purposes, but put back by the need to maintain referential integrity in the extracted data sample? This data sampler utility will take care that referential dependencies are fulfilled by recursive...

Ruby library to automatically preload data for your serializers

Allows rails to respond to DataTable requests

DatatablesServer will receive a number of variables from a Datatables client and it will perform all the required processing (i.e. when paging, sorting, filtering etc), and then return the data in the format required by DataTables