Make default_timezone a module instance variable

lib/active_record/connection_adapters/oracle_enhanced/jdbc_connection.rb

@@ -145,9 +145,9 @@ def new_connection(config)
             end
 
             # Set session time zone to current time zone
-            if ActiveRecord::Base.default_timezone == :local
+            if ActiveRecord.default_timezone == :local
               @raw_connection.setSessionTimeZone(time_zone)
-            elsif ActiveRecord::Base.default_timezone == :utc
+            elsif ActiveRecord.default_timezone == :utc
               @raw_connection.setSessionTimeZone("UTC")
             end
 
@@ -498,13 +498,13 @@ def get_ruby_value_from_result_set(rset, i, type_name, get_lob_value = true)
             if dt = rset.getDATE(i)
               d = dt.dateValue
               t = dt.timeValue
-              Time.send(Base.default_timezone, d.year + 1900, d.month + 1, d.date, t.hours, t.minutes, t.seconds)
+              Time.send(ActiveRecord.default_timezone, d.year + 1900, d.month + 1, d.date, t.hours, t.minutes, t.seconds)
             else
               nil
             end
           when :TIMESTAMP, :TIMESTAMPTZ, :TIMESTAMPLTZ, :"TIMESTAMP WITH TIME ZONE", :"TIMESTAMP WITH LOCAL TIME ZONE"
             ts = rset.getTimestamp(i)
-            ts && Time.send(Base.default_timezone, ts.year + 1900, ts.month + 1, ts.date, ts.hours, ts.minutes, ts.seconds,
+            ts && Time.send(ActiveRecord.default_timezone, ts.year + 1900, ts.month + 1, ts.date, ts.hours, ts.minutes, ts.seconds,
               ts.nanos / 1000)
           when :CLOB
             get_lob_value ? lob_to_ruby_value(rset.getClob(i)) : rset.getClob(i)

lib/active_record/connection_adapters/oracle_enhanced/oci_connection.rb

@@ -289,9 +289,9 @@ def create_time_with_default_timezone(value)
           end
           # code from Time.time_with_datetime_fallback
           begin
-            Time.send(Base.default_timezone, year, month, day, hour, min, sec, usec)
+            Time.send(ActiveRecord.default_timezone, year, month, day, hour, min, sec, usec)
           rescue
-            offset = Base.default_timezone.to_sym == :local ? ::DateTime.local_offset : 0
+            offset = ActiveRecord.default_timezone.to_sym == :local ? ::DateTime.local_offset : 0
             ::DateTime.civil(year, month, day, hour, min, sec, offset)
           end
         end
@@ -343,9 +343,9 @@ def self.new_connection(config)
           conn.non_blocking = true if async
           conn.prefetch_rows = prefetch_rows
           conn.exec "alter session set cursor_sharing = #{cursor_sharing}" rescue nil if cursor_sharing
-          if ActiveRecord::Base.default_timezone == :local
+          if ActiveRecord.default_timezone == :local
             conn.exec "alter session set time_zone = '#{time_zone}'" unless time_zone.blank?
-          elsif ActiveRecord::Base.default_timezone == :utc
+          elsif ActiveRecord.default_timezone == :utc
             conn.exec "alter session set time_zone = '+00:00'"
           end
           conn.exec "alter session set current_schema = #{schema}" unless schema.blank?

lib/active_record/connection_adapters/oracle_enhanced/quoting.rb

@@ -115,7 +115,7 @@ def _type_cast(value)
           case value
           when Type::OracleEnhanced::TimestampTz::Data, Type::OracleEnhanced::TimestampLtz::Data
             if value.acts_like?(:time)
-              zone_conversion_method = ActiveRecord::Base.default_timezone == :utc ? :getutc : :getlocal
+              zone_conversion_method = ActiveRecord.default_timezone == :utc ? :getutc : :getlocal
               value.respond_to?(zone_conversion_method) ? value.send(zone_conversion_method) : value
             else
               value

spec/active_record/connection_adapters/oracle_enhanced/connection_spec.rb

@@ -232,7 +232,7 @@ class ::Post < ActiveRecord::Base
     end
 
     it "should respect default_timezone = :utc than time_zone setting" do
-      # it expects that ActiveRecord::Base.default_timezone = :utc
+      # it expects that ActiveRecord.default_timezone = :utc
       ActiveRecord::ConnectionAdapters::OracleEnhanced::Connection.create(CONNECTION_WITH_TIMEZONE_PARAMS)
       post = Post.create!
       created_at = post.created_at

spec/active_record/connection_adapters/oracle_enhanced_data_types_spec.rb

@@ -122,7 +122,7 @@ class ::TestEmployee < ActiveRecord::Base
   end
 
   after(:each) do
-    ActiveRecord::Base.default_timezone = :utc
+    ActiveRecord.default_timezone = :utc
   end
 
   it "should assign ISO string to date column" do
@@ -170,7 +170,7 @@ class ::TestEmployee < ActiveRecord::Base
   end
 
   it "should assign ISO time string to datetime column" do
-    ActiveRecord::Base.default_timezone = :local
+    ActiveRecord.default_timezone = :local
     @employee = TestEmployee.create(
       first_name: "First",
       last_name: "Last",
@@ -182,7 +182,7 @@ class ::TestEmployee < ActiveRecord::Base
   end
 
   it "should assign NLS time string to datetime column" do
-    ActiveRecord::Base.default_timezone = :local
+    ActiveRecord.default_timezone = :local
     @employee = TestEmployee.create(
       first_name: "First",
       last_name: "Last",
@@ -205,7 +205,7 @@ class ::TestEmployee < ActiveRecord::Base
   end
 
   it "should assign ISO date string to datetime column" do
-    ActiveRecord::Base.default_timezone = :local
+    ActiveRecord.default_timezone = :local
     @employee = TestEmployee.create(
       first_name: "First",
       last_name: "Last",
@@ -217,7 +217,7 @@ class ::TestEmployee < ActiveRecord::Base
   end
 
   it "should assign NLS date string to datetime column" do
-    ActiveRecord::Base.default_timezone = :local
+    ActiveRecord.default_timezone = :local
     @employee = TestEmployee.create(
       first_name: "First",
       last_name: "Last",

spec/active_record/oracle_enhanced/type/timestamp_spec.rb

@@ -4,7 +4,7 @@
   include SchemaSpecHelper
 
   before(:all) do
-    ActiveRecord::Base.default_timezone = :local
+    ActiveRecord.default_timezone = :local
     ActiveRecord::Base.establish_connection(CONNECTION_WITH_TIMEZONE_PARAMS)
     @conn = ActiveRecord::Base.connection
     schema_define do
@@ -28,7 +28,7 @@
 
   after(:all) do
     @conn.drop_table :test_employees, if_exists: true
-    ActiveRecord::Base.default_timezone = :utc
+    ActiveRecord.default_timezone = :utc
   end
 
   describe "/ TIMESTAMP WITH TIME ZONE values from ActiveRecord model" do