From 02da4287bed6e3cb700a91268e13a713f9713ef9 Mon Sep 17 00:00:00 2001
From: Aidan Haran <aharan@fusioneer.com>
Date: Wed, 14 Apr 2021 12:12:52 +0100
Subject: [PATCH] Handle default boolean column values when deduplicating

---
 CHANGELOG.md                                     |  1 +
 .../connection_adapters/sqlserver_column.rb      | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 33de060f7..af8191e48 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 #### Fixed
 
 - [#872](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/872) Use native String#start_with
+- [#875](https://github.com/rails-sqlserver/activerecord-sqlserver-adapter/pull/875) Handle default boolean column values when deduplicating
 
 #### Changed
 
diff --git a/lib/active_record/connection_adapters/sqlserver_column.rb b/lib/active_record/connection_adapters/sqlserver_column.rb
index b03e8e7e4..acd2c40ef 100644
--- a/lib/active_record/connection_adapters/sqlserver_column.rb
+++ b/lib/active_record/connection_adapters/sqlserver_column.rb
@@ -27,6 +27,22 @@ def is_utf8?
       def case_sensitive?
         collation && collation.match(/_CS/)
       end
+
+      private
+
+      # Handle when the default value is a boolean. Boolean's do not respond to the method `:-@`. Method now
+      # checks whether the default value is already frozen and if so it uses that, otherwise it calls `:-@` to
+      # freeze it.
+      def deduplicated
+        @name = -name
+        @sql_type_metadata = sql_type_metadata.deduplicate if sql_type_metadata
+        @default = (default.frozen? ? default : -default) if default
+        @default_function = -default_function if default_function
+        @collation = -collation if collation
+        @comment = -comment if comment
+
+        freeze
+      end
     end
   end
 end