Rails now has support for multiple databases so you don’t have to store your data all in one place. At this time the following features are supported: Multiple writer databases and a replica for each. Automatic connection switching for the model you’re working with.
How can we use two databases to a single application in Rails?
Setting up multiple database connections in one Rails app
- development: adapter: postgresql.
- OCTO_DB = YAML.load_file(File.join(Rails.root, “config”, “octo_database.yml”))[Rails.env.to_s] Rails now knows to load the new db config.
- Cat.first.name.
- class Cat < ActiveRecord::Base.
- Cat.first.say_meow!(User.first)
How do I connect to multiple MySQL databases?
Connect to multiple MySQL databases with PHP
- Configuration. Create a config.
- Manipulating Records. From the first database select all records from the posts table and insert a record in the users table in another database.
- Conclusion.
What does rake db create do?
3 Answers
- rake db:create:all creates all the databases for the application (which are defined in database.yml )
- rake db:create creates the database for the current RAILS_ENV environment. If RAILS_ENV is not specified it defaults to the development and test databases.
How does rails connect to database?
Connecting MySQL with Ruby on Rails
- Step 1: Install MySQL in the System.
- Step2: Create a Database in the Local.
- Step3: Create a New Rails App using Mysql.
- Step4: Change the Database.yml with your Mysql Database Name that we Created Earlier.
Does Rails db setup run migrations?
2. Rails 4 will perform rake db:migrate when calling rake db:setup if there are pending migrations but won’t execute pending migrations.
