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https://rubyinrails.com/2019/03/25/rails-6-activerecord-multi-db-connection-switching/
Mar 25, 2019 · Rails 6 ActiveRecord supports Multiple database connection switching. Moreover, we can use different database connections for reading / writing with use of replicas to improve performance of the application. Before Rails 6, developers preferred gems like SecondBase or MultiVerse to be able to connect models to different databases. They had
https://github.com/citusdata/activerecord-multi-tenant
Oct 30, 2019 · Supported Rails versions. All Ruby on Rails versions starting with 4.2 or newer (up to 6.0) are supported. This gem only supports ActiveRecord (the Rails default ORM), and not alternative ORMs like Sequel. Usage. It is required that you add multi_tenant definitions to your model in order to have full support for Citus, in particular when ...
https://guides.rubyonrails.org/active_record_basics.html
Active Record BasicsThis guide is an introduction to Active Record.After reading this guide, you will know: What Object Relational Mapping and Active Record are and how they are used in Rails. How Active Record fits into the Model-View-Controller paradigm. How to use Active Record models to manipulate data stored in a relational database.
https://stackoverflow.com/questions/821251/how-to-configure-ruby-on-rails-with-no-database
How to configure Ruby on Rails with no database? Ask Question Asked 10 years, ... Use -O(Capital 'O') or --skip-activerecord option to generate an application without a database. rails new myApp -O. or. rails new myApp --skip-activerecord. ... For support Rails 6 rc1 and activerecord-nulldb-adaptergem we need a monkey patching.
https://github.com/rails/rails/tree/master/activerecord
Feb 04, 2018 · Active Record – Object-relational mapping in Rails Active Record connects classes to relational database tables to establish an almost zero-configuration persistence layer for applications. The library provides a base class that, when subclassed, sets up a mapping between the new class and an existing table in the database.
https://guides.rubyonrails.org/active_record_querying.html
If you're used to using raw SQL to find database records, then you will generally find that there are better ways to carry out the same operations in Rails. Active Record insulates you from the need to use SQL in most cases. Code examples throughout this guide will refer to one or more of the following models:
https://edgeguides.rubyonrails.org/active_record_migrations.html
Active Record MigrationsMigrations are a feature of Active Record that allows you to evolve your database schema over time. Rather than write schema modifications in pure SQL, migrations allow you to use a Ruby DSL to describe changes to your tables.After reading this guide, you will know: The generators you can use to create them. The methods Active Record provides to manipulate your database ...
https://www.devdungeon.com/content/ruby-activerecord-without-rails-tutorial
The Ruby ActiveRecord gem provides easy-to-use abstractions for working with databases and allows you to easily swap out the database backend. For example to switch from SQLite3 to MySQL without changing code. It has built-in support for database abstractions to SQLite3, MySQL, and PostgreSQL. One of the primary aspects of ActiveRecord is that there is very little to no configuration needed ...
https://api.rubyonrails.org/classes/ActiveRecord/Locking/Pessimistic.html
Obtain a row lock on this record. Reloads the record to obtain the requested lock. Pass an SQL locking clause to append the end of the SELECT statement or pass true for “FOR UPDATE” (the default, an exclusive row lock).
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