Merge pull request rails#41292 from intrip/41156-fix-mysql-virtual-column-with-escapes

Fix Mysql schema for virtual column expressions with quotes

Author: rafaelfranca

activerecord/lib/active_record/connection_adapters/mysql/schema_dumper.rb

@@ -79,7 +79,10 @@ def extract_expression_for_virtual_column(column)
                     " WHERE table_schema = #{scope[:schema]}" \
                     "   AND table_name = #{scope[:name]}" \
                     "   AND column_name = #{column_name}"
-              @connection.query_value(sql, "SCHEMA").inspect
+              # Calling .inspect leads into issues with the query result
+              # which already returns escaped quotes.
+              # We remove the escape sequence from the result in order to deal with double escaping issues.
+              @connection.query_value(sql, "SCHEMA").gsub("\\'", "'").inspect
             end
           end
       end

activerecord/test/cases/adapters/mysql2/virtual_column_test.rb

@@ -19,6 +19,8 @@ def setup
         t.virtual :upper_name,  type: :string,  as: "UPPER(`name`)"
         t.virtual :name_length, type: :integer, as: "LENGTH(`name`)", stored: true
         t.virtual :name_octet_length, type: :integer, as: "OCTET_LENGTH(`name`)", stored: true
+        t.json    :profile
+        t.virtual :profile_email, type: :string, as: "json_extract(`profile`,_utf8mb4'$.email')", stored: true
       end
       VirtualColumn.create(name: "Rails")
     end
@@ -58,6 +60,7 @@ def test_schema_dumping
       assert_match(/t\.virtual\s+"upper_name",\s+type: :string,\s+as: "(?:UPPER|UCASE)\(`name`\)"$/i, output)
       assert_match(/t\.virtual\s+"name_length",\s+type: :integer,\s+as: "(?:octet_length|length)\(`name`\)",\s+stored: true$/i, output)
       assert_match(/t\.virtual\s+"name_octet_length",\s+type: :integer,\s+as: "(?:octet_length|length)\(`name`\)",\s+stored: true$/i, output)
+      assert_match(/t\.virtual\s+"profile_email",\s+type: :string,\s+as: "json_extract\(`profile`,\w*?'\$\.email'\)", stored: true$/i, output)
     end
   end
 end