Fix PostgreSQL insert to properly extract table name from multiline string SQL.

Previously, executing an insert SQL in PostgreSQL with a command like this:

    insert into articles(
      number)
    values(
      5152
    )

would not work because the adapter was unable to extract the correct articles table name.

activerecord/CHANGELOG.md

@@ -1,3 +1,18 @@
+*   Fix `PostgreSQL` insert to properly extract table name from multiline string SQL.
+
+    Previously, executing an insert SQL in `PostgreSQL` with a command like this:
+
+        insert into articles(
+          number)
+        values(
+          5152
+        )
+
+    would not work because the adapter was unable to extract the correct `articles`
+    table name.
+
+    *Kuldeep Aggarwal*
+
 *   `Relation` no longer has mutator methods like `#map!` and `#delete_if`. Convert
     to an `Array` by calling `#to_a` before using these methods.
 

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -969,7 +969,7 @@ module ActiveRecord
         end
 
         def extract_table_ref_from_insert_sql(sql)
-          sql[/into\s+([^\(]*).*values\s*\(/i]
+          sql[/into\s+([^\(]*).*values\s*\(/im]
           $1.strip if $1
         end
 

activerecord/test/cases/adapters/postgresql/postgresql_adapter_test.rb

@@ -62,6 +62,18 @@ module ActiveRecord
         assert_equal expect, id
       end
 
+      def test_multiline_insert_sql
+        id = @connection.insert_sql(<<-SQL)
+        insert into ex(
+          number)
+        values(
+          5152
+        )
+        SQL
+        expect = @connection.query('select max(id) from ex').first.first
+        assert_equal expect, id
+      end
+
       def test_insert_sql_with_returning_disabled
         connection = connection_without_insert_returning
         id = connection.insert_sql("insert into postgresql_partitioned_table_parent (number) VALUES (1)")