Merge pull request #79 from dwallace0723/add-star-optional-qualifier

Star macro optional alias argument

README.md

@@ -175,7 +175,7 @@ Usage:
 ```
 
 #### star ([source](macros/sql/star.sql))
-This macro generates a list of all fields that exist in the `from` relation, excluding any fields listed in the `except` argument. The construction is identical to `select * from {{ref('my_model')}}`, replacing star (`*`) with the star macro.
+This macro generates a list of all fields that exist in the `from` relation, excluding any fields listed in the `except` argument. The construction is identical to `select * from {{ref('my_model')}}`, replacing star (`*`) with the star macro. This macro also has an optional `relation_alias` argument that will prefix all generated fields with an alias.
 
 Usage:
 ```

macros/sql/star.sql

@@ -1,4 +1,4 @@
-{% macro star(from, except=[]) -%}
+{% macro star(from, relation_alias=False, except=[]) -%}
 
     {#-- Prevent querying of db in parsing mode. This works because this macro does not create any new refs. #}
     {%- if not execute -%}
@@ -23,7 +23,7 @@
 
     {%- for col in include_cols %}
 
-        "{{ col }}" {% if not loop.last %},
+        {% if relation_alias %} {{ relation_alias }}.{% endif %}"{{ col }}" {% if not loop.last %},
         {% endif %}
 
     {%- endfor -%}