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Methods
C
E
R
Constants
RAILS_ENV = -> { (Rails.env if defined?(Rails.env)) || ENV["RAILS_ENV"] || ENV["RACK_ENV"] }
 
DEFAULT_ENV = -> { RAILS_ENV.call || "default_env" }
 
Attributes
[W] connection_specification_name
Instance Public methods
connected?()

Returns true if Active Record is connected.

# File activerecord/lib/active_record/connection_handling.rb, line 120
def connected?
  connection_handler.connected?(connection_specification_name)
end
connection()

Returns the connection currently associated with the class. This can also be used to “borrow” the connection to do database work unrelated to any of the specific Active Records.

# File activerecord/lib/active_record/connection_handling.rb, line 87
def connection
  retrieve_connection
end
connection_config()

Returns the configuration of the associated connection as a hash:

ActiveRecord::Base.connection_config
# => {pool: 5, timeout: 5000, database: "db/development.sqlite3", adapter: "sqlite3"}

Please use only for reading.

# File activerecord/lib/active_record/connection_handling.rb, line 107
def connection_config
  connection_pool.spec.config
end
connection_pool()
# File activerecord/lib/active_record/connection_handling.rb, line 111
def connection_pool
  connection_handler.retrieve_connection_pool(connection_specification_name) || raise(ConnectionNotEstablished)
end
connection_specification_name()

Return the specification name from the current class or its parent.

# File activerecord/lib/active_record/connection_handling.rb, line 94
def connection_specification_name
  if !defined?(@connection_specification_name) || @connection_specification_name.nil?
    return self == Base ? "primary" : superclass.connection_specification_name
  end
  @connection_specification_name
end
establish_connection(config = nil)

Establishes the connection to the database. Accepts a hash as input where the :adapter key must be specified with the name of a database adapter (in lower-case) example for regular databases (MySQL, PostgreSQL, etc):

ActiveRecord::Base.establish_connection(
  adapter:  "mysql2",
  host:     "localhost",
  username: "myuser",
  password: "mypass",
  database: "somedatabase"
)

Example for SQLite database:

ActiveRecord::Base.establish_connection(
  adapter:  "sqlite3",
  database: "path/to/dbfile"
)

Also accepts keys as strings (for parsing from YAML for example):

ActiveRecord::Base.establish_connection(
  "adapter"  => "sqlite3",
  "database" => "path/to/dbfile"
)

Or a URL:

ActiveRecord::Base.establish_connection(
  "postgres://myuser:mypass@localhost/somedatabase"
)

In case ActiveRecord::Base.configurations is set (Rails automatically loads the contents of config/database.yml into it), a symbol can also be given as argument, representing a key in the configuration hash:

ActiveRecord::Base.establish_connection(:production)

The exceptions AdapterNotSpecified, AdapterNotFound and ArgumentError may be returned on an error.

# File activerecord/lib/active_record/connection_handling.rb, line 47
def establish_connection(config = nil)
  raise "Anonymous class is not allowed." unless name

  config ||= DEFAULT_ENV.call.to_sym
  spec_name = self == Base ? "primary" : name
  self.connection_specification_name = spec_name

  resolver = ConnectionAdapters::ConnectionSpecification::Resolver.new(Base.configurations)
  spec = resolver.resolve(config).symbolize_keys
  spec[:name] = spec_name

  connection_handler.establish_connection(spec)
end
remove_connection(name = nil)
# File activerecord/lib/active_record/connection_handling.rb, line 124
def remove_connection(name = nil)
  name ||= @connection_specification_name if defined?(@connection_specification_name)
  # if removing a connection that has a pool, we reset the
  # connection_specification_name so it will use the parent
  # pool.
  if connection_handler.retrieve_connection_pool(name)
    self.connection_specification_name = nil
  end

  connection_handler.remove_connection(name)
end
retrieve_connection()
# File activerecord/lib/active_record/connection_handling.rb, line 115
def retrieve_connection
  connection_handler.retrieve_connection(connection_specification_name)
end