fix dsl sql_transaction

Author: tracyloisel

lib/csv_importer/config.rb

@@ -9,13 +9,15 @@ class Config
     attribute :when_invalid, Symbol, default: proc { :skip }
     attribute :after_build_blocks, Array[Proc], default: []
     attribute :after_save_blocks, Array[Proc], default: []
+    attribute :sql_transaction, Symbol, default: proc { :all_rows }
 
     def initialize_copy(orig)
       super
       self.column_definitions = orig.column_definitions.dup
       self.identifiers = orig.identifiers.dup
       self.after_save_blocks = orig.after_save_blocks.dup
       self.after_build_blocks = orig.after_build_blocks.dup
+      self.sql_transaction = orig.sql_transaction.dup
     end
 
     def after_build(block)

lib/csv_importer/dsl.rb

@@ -27,5 +27,9 @@ def after_build(&block)
     def after_save(&block)
       config.after_save(block)
     end
+
+    def sql_transaction(behavior)
+      config.sql_transaction = behavior
+    end
   end
 end