![]() Ruby on Rails and PostgreSQLīoth PostgreSQL and Ruby on Rails are available on any UNIX/Linux distribution. This tutorial will guide you through the process of configuring PostgreSQL for your Ruby on Rails application. ![]() However, it also supports PostgreSQL integration. By default, Rails assume SQL for database functionalities. ![]() It’s a database-agnostic framework, meaning it can work with a wide variety of databases. Ruby on Rails is a popular web framework written in Ruby. Similar to its competitors MySQL and SQLite, PostgreSQL also has its strong and weak points. Because PostgreSQL is a popular choice, it’s supported by almost all major web frameworks. It’s a well-known open-source database system known for its reliability, robust features, and performance. # reset config variables to original valuesĮNV = am in process of putting together a template for Rails applications with out of the box support for different database back-ends (PG, MySQL, Mongo, Arango.) within a Docker stack, basically a one liner to set up the whole thing, it will pop up soon on Github.Among all the available database engines, PostgreSQL is one of the most popular ones. # set config variables for custom database # append and prepend proper tasks to all the tasks defined here above The constants come from initializers, eg: POSTGRES_DATABASE = YAML::load( ERB.new( File.read("#.rb"Īnd the rake task: lib/tasks/pg.rake desc "Managing the pg database" You can have two classes to subclass your models from: class PostgresRecord < ApplicationRecordĪnd class MysqlRecord < ApplicationRecord This also solved my next problem which would have been maintaining a pool of several hundred connections per type of model. Solved by putting models into sub-classes of ActiveRecord and managing connections from them sub-classes. Is there a way to specify what connection to use for the models that don't specify what connection to use? Sorts of a default? Now the errors above are gone, but the MySQL models throw errors as it appears ActiveRecord establishes the connection to postgres and leaves it open. dbconfig = YAML::load(File.open('./database.yml'))ĪctiveRecord::nfigurations = dbconfig I have done this instead of establishing a connection manually for each database. Available: (ActiveRecord::AdapterNotSpecified ![]() Then when I load one of the postgres models I get this error: /usr/lib/ruby/gems/2.3.0/gems/activerecord-4.2.5/lib/active_record/connection_adapters/connection_specification.rb:248:in `resolve_symbol_connection': 'postgres' database is not configured. Then in the cron jobs: dbconfig = YAML::load(File.open('./database.yml'))ĪctiveRecord::Base.establish_connection(dbconfig) In the postgres-hosted models I do: class Thing < ActiveRecord::Base Now I have a problem: some cron jobs which load the same database.yml file stopped working because of those models that use the postgres database although the YML is ok, indented fine, reads fine, the "postgres" section is there, the Rails application works fine. This has worked for me after installing the pg gem: Rails: mysql & postgres at the same time in the same app? I do not want to move the whole database to Postgres. There are no relations between these models and any others. I've built a Rails application using MySQL and now would like to move some models to a Postgres database for performance reasons, the tables are quite big and Postgres is faster.
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