migration.rb in strong_migrations-0.1.2

- old
+ new

@@ -6,12 +6,17 @@
       yield
     ensure
       @safe = previous_value
     end
 
+    def migrate(direction)
+      @direction = direction
+      super
+    end
+
     def method_missing(method, *args, &block)
-      unless @safe || is_a?(ActiveRecord::Schema)
+      unless @safe || is_a?(ActiveRecord::Schema) || @direction == :down
         case method
         when :remove_column
           raise_error :remove_column
         when :remove_timestamps
           raise_error :remove_column
@@ -20,10 +25,14 @@
         when :rename_table
           raise_error :rename_table
         when :rename_column
           raise_error :rename_column
         when :add_index
+          columns = args[1]
+          if columns.is_a?(Array) && columns.size > 3
+            raise_error :add_index_columns
+          end
           options = args[2]
           if %w(PostgreSQL PostGIS).include?(connection.adapter_name) && !(options && options[:algorithm] == :concurrently)
             raise_error :add_index
           end
         when :add_column
@@ -105,9 +114,13 @@
 
   def change
     commit_db_transaction
     add_index :users, :some_column, algorithm: :concurrently
   end"
+        when :add_index_columns
+"Adding an index with more than three columns only helps on extremely large tables.
+
+If you're sure this is what you want, wrap it in a safety_assured { ... } block."
         when :change_table
 "The strong_migrations gem does not support inspecting what happens inside a
 change_table block, so cannot help you here. Please make really sure that what
 you're doing is safe before proceding, then wrap it in a safety_assured { ... } block."
         end