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# frozen_string_literal: true
require "active_record/database_configurations/database_config"
require "active_record/database_configurations/hash_config"
require "active_record/database_configurations/url_config"
module ActiveRecord
# ActiveRecord::DatabaseConfigurations returns an array of DatabaseConfig
# objects (either a HashConfig or UrlConfig) that are constructed from the
# application's database configuration hash or url string.
class DatabaseConfigurations
attr_reader :configurations
delegate :any?, to: :configurations
def initialize(configurations = {})
@configurations = build_configs(configurations)
end
# Collects the configs for the environment and optionally the specification
# name passed in. To include replica configurations pass `include_replicas: true`.
#
# If a spec name is provided a single DatabaseConfig object will be
# returned, otherwise an array of DatabaseConfig objects will be
# returned that corresponds with the environment and type requested.
#
# Options:
#
# <tt>env_name:</tt> The environment name. Defaults to +nil+ which will collect
# configs for all environments.
# <tt>spec_name:</tt> The specification name (i.e. primary, animals, etc.). Defaults
# to +nil+.
# <tt>include_replicas:</tt> Determines whether to include replicas in
# the returned list. Most of the time we're only iterating over the write
# connection (i.e. migrations don't need to run for the write and read connection).
# Defaults to +false+.
def configs_for(env_name: nil, spec_name: nil, include_replicas: false)
configs = env_with_configs(env_name)
unless include_replicas
configs = configs.select do |db_config|
!db_config.replica?
end
end
if spec_name
configs.find do |db_config|
db_config.spec_name == spec_name
end
else
configs
end
end
# Returns the config hash that corresponds with the environment
#
# If the application has multiple databases `default_hash` will
# return the first config hash for the environment.
#
# { database: "my_db", adapter: "mysql2" }
def default_hash(env = ActiveRecord::ConnectionHandling::DEFAULT_ENV.call.to_s)
default = find_db_config(env)
default.config if default
end
alias :[] :default_hash
# Returns a single DatabaseConfig object based on the requested environment.
#
# If the application has multiple databases `find_db_config` will return
# the first DatabaseConfig for the environment.
def find_db_config(env)
configurations.find do |db_config|
db_config.env_name == env.to_s ||
(db_config.for_current_env? && db_config.spec_name == env.to_s)
end
end
# Returns the DatabaseConfigurations object as a Hash.
def to_h
configs = configurations.reverse.inject({}) do |memo, db_config|
memo.merge(db_config.to_legacy_hash)
end
Hash[configs.to_a.reverse]
end
# Checks if the application's configurations are empty.
#
# Aliased to blank?
def empty?
configurations.empty?
end
alias :blank? :empty?
private
def env_with_configs(env = nil)
if env
configurations.select { |db_config| db_config.env_name == env }
else
configurations
end
end
def build_configs(configs)
return configs.configurations if configs.is_a?(DatabaseConfigurations)
return configs if configs.is_a?(Array)
build_db_config = configs.each_pair.flat_map do |env_name, config|
walk_configs(env_name.to_s, "primary", config)
end.compact
if url = ENV["DATABASE_URL"]
build_url_config(url, build_db_config)
else
build_db_config
end
end
def walk_configs(env_name, spec_name, config)
case config
when String
build_db_config_from_string(env_name, spec_name, config)
when Hash
build_db_config_from_hash(env_name, spec_name, config.stringify_keys)
end
end
def build_db_config_from_string(env_name, spec_name, config)
url = config
uri = URI.parse(url)
if uri.try(:scheme)
ActiveRecord::DatabaseConfigurations::UrlConfig.new(env_name, spec_name, url)
end
rescue URI::InvalidURIError
ActiveRecord::DatabaseConfigurations::HashConfig.new(env_name, spec_name, config)
end
def build_db_config_from_hash(env_name, spec_name, config)
if config.has_key?("url")
url = config["url"]
config_without_url = config.dup
config_without_url.delete "url"
ActiveRecord::DatabaseConfigurations::UrlConfig.new(env_name, spec_name, url, config_without_url)
elsif config["database"] || (config.size == 1 && config.values.all? { |v| v.is_a? String })
ActiveRecord::DatabaseConfigurations::HashConfig.new(env_name, spec_name, config)
else
config.each_pair.map do |sub_spec_name, sub_config|
walk_configs(env_name, sub_spec_name, sub_config)
end
end
end
def build_url_config(url, configs)
env = ActiveRecord::ConnectionHandling::DEFAULT_ENV.call.to_s
if original_config = configs.find(&:for_current_env?)
if original_config.url_config?
configs
else
configs.map do |config|
ActiveRecord::DatabaseConfigurations::UrlConfig.new(config.env_name, config.spec_name, url, config.config)
end
end
else
configs + [ActiveRecord::DatabaseConfigurations::UrlConfig.new(env, "primary", url)]
end
end
def method_missing(method, *args, &blk)
case method
when :each, :first
throw_getter_deprecation(method)
configurations.send(method, *args, &blk)
when :fetch
throw_getter_deprecation(method)
configs_for(env_name: args.first)
when :values
throw_getter_deprecation(method)
configurations.map(&:config)
when :[]=
throw_setter_deprecation(method)
env_name = args[0]
config = args[1]
remaining_configs = configurations.reject { |db_config| db_config.env_name == env_name }
new_config = build_configs(env_name => config)
new_configs = remaining_configs + new_config
ActiveRecord::Base.configurations = new_configs
else
raise NotImplementedError, "`ActiveRecord::Base.configurations` in Rails 6 now returns an object instead of a hash. The `#{method}` method is not supported. Please use `configs_for` or consult the documentation for supported methods."
end
end
def throw_setter_deprecation(method)
ActiveSupport::Deprecation.warn("Setting `ActiveRecord::Base.configurations` with `#{method}` is deprecated. Use `ActiveRecord::Base.configurations=` directly to set the configurations instead.")
end
def throw_getter_deprecation(method)
ActiveSupport::Deprecation.warn("`ActiveRecord::Base.configurations` no longer returns a hash. Methods that act on the hash like `#{method}` are deprecated and will be removed in Rails 6.1. Use the `configs_for` method to collect and iterate over the database configurations.")
end
end
end
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