Merge pull request #36814 from eileencodes/introduce-invalid-configuration-error

Introduce InvalidConfigurationError

activerecord/lib/active_record/database_configurations.rb

@@ -9,6 +9,8 @@ module ActiveRecord
   # objects (either a HashConfig or UrlConfig) that are constructed from the
   # application's database configuration hash or URL string.
   class DatabaseConfigurations
+    class InvalidConfigurationError < StandardError; end
+
     attr_reader :configurations
     delegate :any?, to: :configurations
 
@@ -146,17 +148,19 @@ module ActiveRecord
           build_db_config_from_string(env_name, spec_name, config)
         when Hash
           build_db_config_from_hash(env_name, spec_name, config.stringify_keys)
+        else
+          raise InvalidConfigurationError, "'{ #{env_name} => #{config} }' is not a valid configuration. Expected '#{config}' to be a URL string or a Hash."
         end
       end
 
       def build_db_config_from_string(env_name, spec_name, config)
         url = config
         uri = URI.parse(url)
-        if uri&.scheme
+        if uri.scheme
           ActiveRecord::DatabaseConfigurations::UrlConfig.new(env_name, spec_name, url)
+        else
+          raise InvalidConfigurationError, "'{ #{env_name} => #{config} }' is not a valid configuration. Expected '#{config}' to be a URL string or a Hash."
         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)

activerecord/test/cases/connection_adapters/merge_and_resolve_default_url_config_test.rb

@@ -28,6 +28,22 @@ module ActiveRecord
         resolver.resolve(spec, spec)
       end
 
+      def test_invalid_string_config
+        config = { "foo" => "bar" }
+
+        assert_raises ActiveRecord::DatabaseConfigurations::InvalidConfigurationError do
+          resolve_config(config)
+        end
+      end
+
+      def test_invalid_symbol_config
+        config = { "foo" => :bar }
+
+        assert_raises ActiveRecord::DatabaseConfigurations::InvalidConfigurationError do
+          resolve_config(config)
+        end
+      end
+
       def test_resolver_with_database_uri_and_current_env_symbol_key
         ENV["DATABASE_URL"] = "postgres://localhost/foo"
         config   = { "not_production" => {  "adapter" => "not_postgres", "database" => "not_foo" } }