Merge pull request #71 from fishtown-analytics/fix/remove-in-filter

fix for old versions of jinja

Author: drewbanin

README.md

@@ -285,7 +285,7 @@ Usage:
     period = "day",
     timestamp_field = "created_at",
     start_date = "2018-01-01",
-    stop_date = "2018-06-01"
+    stop_date = "2018-06-01")
 }}
 
 with events as (

macros/materializations/insert_by_period_materialization.sql

@@ -48,7 +48,7 @@
   {%- set stop_date = config.get('stop_date') or '' -%}}
   {%- set period = config.get('period') or 'week' -%}
 
-  {%- if not '__PERIOD_FILTER__' is in sql -%}
+  {%- if sql.find('__PERIOD_FILTER__') == -1 -%}
     {%- set error_message -%}
       Model '{{ model.unique_id }}' does not include the required string '__PERIOD_FILTER__' in its sql
     {%- endset -%}