Where is config database yml?

The main databases. yml configuration file for a project can be found in the config/ directory. Most of the time, all applications of a project share the same database. That’s why the main database configuration file is in the project config/ directory.

What is config database yml?

The database. yml is a file that is created with new rails applications in /config and defines the database configurations that your application will use in different environments.

How to configure PostgreSQL in Rails?

3 of Rails; for information on the latest versions, check out the official sites for Ruby and Rails.

  1. Step 1 — Installing PostgreSQL.
  2. Step 2 — Creating a Database Role for Your Application.
  3. Step 3 — Creating a New Rails Application.
  4. Step 4 — Configuring and Creating Your Database.
  5. Step 5 — Testing Your Configuration.

What is pool in database yml?

The pool attribute specifies the maximum number of connections that can be opened at a given time. See http://guides.rubyonrails.org/configuring.html#database-pooling for more information about this.

What is ActiveRecord base?

ActiveRecord::Base indicates that the ActiveRecord class or module has a static inner class called Base that you’re extending.

What is a Yaml file?

YAML is a data serialization language that is often used for writing configuration files. Depending on whom you ask, YAML stands for yet another markup language or YAML ain’t markup language (a recursive acronym), which emphasizes that YAML is for data, not documents.

What does rake db setup do?

rake db:migrate makes changes to the existing schema. Its like creating versions of schema. db:migrate will look in db/migrate/ for any ruby files and execute the migrations that aren’t run yet starting with the oldest.

How do I list databases in PostgreSQL?

Use \l or \l+ in psql to show all databases in the current PostgreSQL server. Use the SELECT statement to query data from the pg_database to get all databases.

How do I start PostgreSQL on rails?

3 of Rails; for information on the latest versions, check out the official sites for Ruby and Rails.

  1. Step 1 – Installing PostgreSQL.
  2. Step 2 – Creating a New Database Role.
  3. Step 3 – Creating a New Rails Application.
  4. Step 4 – Configuring and Creating Your Database.
  5. Step 5 – Testing Your Configuration.

Can you use ActiveRecord without rails?

One of the primary aspects of ActiveRecord is that there is very little to no configuration needed. It follow convention over configuration. ActiveRecord is commonly used with the Ruby-on-Rails framework but you can use it with Sinatra or without any web framework if desired.

What is connection pool rails?

A connection pool synchronizes thread access to a limited number of database connections. The basic idea is that each thread checks out a database connection from the pool, uses that connection, and checks the connection back in.

Can you use ActiveRecord without Rails?