Fix PG.connect keyword arguments deprecation warning on ruby 2.7

activerecord/CHANGELOG.md

@@ -1,3 +1,9 @@
+*   Fix PG.connect keyword arguments deprecation warning on ruby 2.7
+
+    Fixes #44307.
+
+    *Nikita Vasilevsky*
+
 *   Fix dropping DB connections after serialization failures and deadlocks.
 
     Prior to 6.1.4, serialization failures and deadlocks caused rollbacks to be

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -75,7 +75,7 @@ module ActiveRecord
 
       class << self
         def new_client(conn_params)
-          PG.connect(conn_params)
+          PG.connect(**conn_params)
         rescue ::PG::Error => error
           if conn_params && conn_params[:dbname] && error.message.include?(conn_params[:dbname])
             raise ActiveRecord::NoDatabaseError.db_error(conn_params[:dbname])
@@ -281,7 +281,7 @@ module ActiveRecord
       def initialize(connection, logger, connection_parameters, config)
         super(connection, logger, config)
 
-        @connection_parameters = connection_parameters
+        @connection_parameters = connection_parameters || {}
 
         # @local_tz is initialized as nil to avoid warnings when connect tries to use it
         @local_tz = nil