Fix issue with default view value not being found because of case sensitivity (#1113)

(cherry picked from commit 0871ed8)

Author: aidanharan

lib/active_record/connection_adapters/sqlserver/schema_statements.rb

@@ -425,7 +425,7 @@ def column_definitions(table_name)
 
           if view_exists
             results = sp_executesql %{
-              SELECT c.COLUMN_NAME AS [name], c.COLUMN_DEFAULT AS [default]
+              SELECT LOWER(c.COLUMN_NAME) AS [name], c.COLUMN_DEFAULT AS [default]
               FROM #{database}.INFORMATION_SCHEMA.COLUMNS c
               WHERE c.TABLE_NAME = #{quote(view_tblnm)}
             }.squish, "SCHEMA", []
@@ -463,7 +463,7 @@ def column_definitions(table_name)
             ci[:default_function] = begin
               default = ci[:default_value]
               if default.nil? && view_exists
-                view_column = views_real_column_name(table_name, ci[:name])
+                view_column = views_real_column_name(table_name, ci[:name]).downcase
                 default = default_functions[view_column] if view_column.present?
               end
               case default

test/cases/view_test_sqlserver.rb

@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require "cases/helper_sqlserver"
+
+class ViewTestSQLServer < ActiveRecord::TestCase
+  let(:connection) { ActiveRecord::Base.connection }
+
+  describe 'view with default values' do
+    before do
+      connection.drop_table :view_casing_table rescue nil
+      connection.create_table :view_casing_table, force: true do |t|
+        t.boolean :Default_Falsey, null: false, default: false
+        t.boolean :Default_Truthy, null: false, default: true
+      end
+
+      connection.execute("DROP VIEW IF EXISTS view_casing_table_view;")
+      connection.execute("CREATE VIEW view_casing_table_view AS SELECT id AS id, default_falsey AS falsey, default_truthy AS truthy FROM view_casing_table")
+    end
+
+    it "default values are correct when column casing used in tables and views are different" do
+      klass = Class.new(ActiveRecord::Base) do
+        self.table_name = "view_casing_table_view"
+      end
+
+      obj = klass.new
+      assert_equal false, obj.falsey
+      assert_equal true, obj.truthy
+      assert_equal 0, klass.count
+
+      obj.save!
+      assert_equal false, obj.falsey
+      assert_equal true, obj.truthy
+      assert_equal 1, klass.count
+    end
+  end
+end