diff options
Diffstat (limited to 'activerecord/lib/active_record/database_configurations.rb')
| -rw-r--r-- | activerecord/lib/active_record/database_configurations.rb | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/database_configurations.rb b/activerecord/lib/active_record/database_configurations.rb new file mode 100644 index 0000000000..9aabde676a --- /dev/null +++ b/activerecord/lib/active_record/database_configurations.rb @@ -0,0 +1,185 @@ +# 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 + + 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 (ie primary, animals, etc.). Defaults + # to +nil+. + # <tt>include_replicas:</tt> Determines whether to include replicas in the + # 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) + + build_db_config = configs.each_pair.flat_map do |env_name, config| + walk_configs(env_name, "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) + end + end + + def build_db_config_from_string(env_name, spec_name, config) + begin + 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 + end + + def build_db_config_from_hash(env_name, spec_name, config) + if 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(env, 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) + if Hash.method_defined?(method) + ActiveSupport::Deprecation.warn \ + "Returning a hash from ActiveRecord::Base.configurations is deprecated. Therefore calling `#{method}` on the hash is also deprecated. Please switch to using the `configs_for` method instead to collect and iterate over database configurations." + end + + case method + when :each, :first + configurations.send(method, *args, &blk) + when :fetch + configs_for(env_name: args.first) + when :values + configurations.map(&:config) + else + super + end + end + end +end |