Remove usage of strip_heredoc in the framework in favor of <<~

Some places we can't remove because Ruby still don't have a method
equivalent to strip_heredoc to be called in an already existent string.

1 files changed, 2 insertions, 4 deletions

diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
index 4a191d337c..526aa20b2c 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_creation.rb
@@ -1,7 +1,5 @@
 # frozen_string_literal: true
 
-require "active_support/core_ext/string/strip"
-
 module ActiveRecord
   module ConnectionAdapters
     class AbstractAdapter
@@ -66,7 +64,7 @@ module ActiveRecord
           end
 
           def visit_ForeignKeyDefinition(o)
-            sql = <<-SQL.strip_heredoc
+            sql = <<~SQL
               CONSTRAINT #{quote_column_name(o.name)}
               FOREIGN KEY (#{quote_column_name(o.column)})
                 REFERENCES #{quote_table_name(o.to_table)} (#{quote_column_name(o.primary_key)})
@@ -133,7 +131,7 @@ module ActiveRecord
             when :cascade  then "ON #{action} CASCADE"
             when :restrict then "ON #{action} RESTRICT"
             else
-              raise ArgumentError, <<-MSG.strip_heredoc
+              raise ArgumentError, <<~MSG
                 '#{dependency}' is not supported for :on_update or :on_delete.
                 Supported values are: :nullify, :cascade, :restrict
               MSG