From 053f532926cc55c0a8db6b3f4bb42f6c88f1cc1d Mon Sep 17 00:00:00 2001
From: Charles Oliver Nutter <headius@headius.com>
Date: Tue, 29 Sep 2026 05:36:04 -0500
Subject: [PATCH 1/3] These methods no lonegr exist in 8.1

---
 lib/arjdbc/abstract/database_statements.rb | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/lib/arjdbc/abstract/database_statements.rb b/lib/arjdbc/abstract/database_statements.rb
index f6de22c5d..9506fb136 100644
--- a/lib/arjdbc/abstract/database_statements.rb
+++ b/lib/arjdbc/abstract/database_statements.rb
@@ -9,19 +9,15 @@ module DatabaseStatements
 
       NO_BINDS = [].freeze
 
-      unless ::ActiveRecord::ConnectionAdapters::AbstractAdapter.method_defined?(:mark_transaction_written_if_write)
-        def mark_transaction_written_if_write(sql)
-          if write_query?(sql)
-            ensure_writes_are_allowed(sql)
-            mark_transaction_written
-          end
+      def mark_transaction_written_if_write(sql)
+        if write_query?(sql)
+          ensure_writes_are_allowed(sql)
+          mark_transaction_written
         end
       end
 
-      unless ::ActiveRecord::ConnectionAdapters::AbstractAdapter.method_defined?(:check_if_write_query)
-        def check_if_write_query(sql)
-          ensure_writes_are_allowed(sql) if write_query?(sql)
-        end
+      def check_if_write_query(sql)
+        ensure_writes_are_allowed(sql) if write_query?(sql)
       end
 
       def exec_insert(sql, name = nil, binds = NO_BINDS, pk = nil, sequence_name = nil, returning: nil)

From 2402d6b07b0d03c7b9ca0356719f683c1953418e Mon Sep 17 00:00:00 2001
From: Charles Oliver Nutter <headius@headius.com>
Date: Tue, 29 Sep 2026 05:38:43 -0500
Subject: [PATCH 2/3] cast_type is always passed in 8.1

---
 lib/arjdbc/sqlite3/adapter.rb | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/lib/arjdbc/sqlite3/adapter.rb b/lib/arjdbc/sqlite3/adapter.rb
index 158abd74b..cb4d59eea 100644
--- a/lib/arjdbc/sqlite3/adapter.rb
+++ b/lib/arjdbc/sqlite3/adapter.rb
@@ -90,9 +90,6 @@ module SQLite3
       "cache_size"          => 2000
     }
 
-    COLUMN_TAKES_CAST_TYPE = ConnectionAdapters::Column.instance_method(:initialize).
-      parameters.any? { |_kind, name| name == :cast_type }
-
     class StatementPool < ConnectionAdapters::StatementPool # :nodoc:
       private
       def dealloc(stmt)
@@ -475,7 +472,7 @@ def new_column_from_field(table_name, field, definitions)
       rowid = is_column_the_rowid?(field, definitions)
 
       column_args = [field["name"]]
-      column_args << lookup_cast_type(field["type"]) if COLUMN_TAKES_CAST_TYPE
+      column_args << lookup_cast_type(field["type"])
       column_args.push(
         default_value,
         type_metadata,

From 2e2452a246986fb5e37a27ec7a948e23345b22b7 Mon Sep 17 00:00:00 2001
From: Charles Oliver Nutter <headius@headius.com>
Date: Tue, 29 Sep 2026 05:44:52 -0500
Subject: [PATCH 3/3] Just use the Rails 8.1 fetch_cast_type here

---
 lib/arjdbc/sqlite3/adapter.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/arjdbc/sqlite3/adapter.rb b/lib/arjdbc/sqlite3/adapter.rb
index cb4d59eea..b04e307f9 100644
--- a/lib/arjdbc/sqlite3/adapter.rb
+++ b/lib/arjdbc/sqlite3/adapter.rb
@@ -614,7 +614,7 @@ def copy_table(from, to, options = {})
             column_options[:stored] = column.virtual_stored?
             column_options[:type] = column.type
           elsif column.has_default?
-            type = column.respond_to?(:fetch_cast_type) ? column.fetch_cast_type(self) : lookup_cast_type_from_column(column)
+            type = column.fetch_cast_type(self)
             default = type.deserialize(column.default)
             default = -> { column.default_function } if default.nil?