module ActiveRecord module ConnectionHandling RAILS_ENV = -> { (Rails.env if defined?(Rails.env)) || ENV["RAILS_ENV"] || ENV["RACK_ENV"] } DEFAULT_ENV = -> { RAILS_ENV.call || "default_env" } # 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}[rdoc-ref:Core.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. 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 class MergeAndResolveDefaultUrlConfig # :nodoc: def initialize(raw_configurations) @raw_config = raw_configurations.dup @env = DEFAULT_ENV.call.to_s end # Returns fully resolved connection hashes. # Merges connection information from `ENV['DATABASE_URL']` if available. def resolve ConnectionAdapters::ConnectionSpecification::Resolver.new(config).resolve_all end private def config @raw_config.dup.tap do |cfg| if url = ENV['DATABASE_URL'] cfg[@env] ||= {} cfg[@env]["url"] ||= url end end end end # 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. def connection retrieve_connection end attr_writer :connection_specification_name # Return the specification name from the current class or its parent. 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 # 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. def connection_config connection_pool.spec.config end def connection_pool connection_handler.retrieve_connection_pool(connection_specification_name) or raise ConnectionNotEstablished end def retrieve_connection connection_handler.retrieve_connection(connection_specification_name) end # Returns +true+ if Active Record is connected. def connected? connection_handler.connected?(connection_specification_name) end 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 def clear_cache! # :nodoc: connection.schema_cache.clear! end delegate :clear_active_connections!, :clear_reloadable_connections!, :clear_all_connections!, :to => :connection_handler end end