Bumped to 1.32.2 with disambiguiated null vs. empty list behavior of …

…Mapnik Grid fields

API.html

@@ -1248,6 +1248,8 @@ <h4><a id="mapnik-grid-provider" name="mapnik-grid-provider">Mapnik Grid</a></h4
     <dt>fields</dt>
     <dd>
     Optional array of field names to return in the response, defaults to all.
+    An empty list will return no field names, while a value of <samp>null</samp>
+    is equivalent to all.
     </dd>
     <dt>layer index</dt>
     <dd>

CHANGELOG

@@ -1,3 +1,6 @@
+2012-05-07: 1.32.2
+- Disambiguated null vs. empty list behavior of Mapnik Grid fields. 
+
 2012-05-06: 1.32.1
 - Fixed output of Mapnik Grid to be pure UTF-8 instead of ASCII-encoded for size.
 

TileStache/Mapnik.py

@@ -147,6 +147,8 @@ class GridProvider:
         
         - fields (optional)
           Array of field names to return in the response, defaults to all.
+          An empty list will return no field names, while a value of null is
+          equivalent to all.
         
         - layer index (optional)
           Which layer from the mapfile to render, defaults to 0 (first layer).
@@ -199,7 +201,11 @@ def renderArea(self, width, height, srs, xmin, ymin, xmax, ymax, zoom):
 
             for (index, fields) in self.layers:
                 datasource = self.mapnik.layers[index].datasource
-                fields = (type(fields) is list) and map(str, fields) or datasource.fields()
+
+                if type(fields) is list:
+                    fields = map(str, fields)
+                else:
+                    fields = datasource.fields()
 
                 grid = mapnik.render_grid(self.mapnik, index, resolution=self.scale, fields=fields)
                 grids.append(grid)

VERSION

@@ -1 +1 @@
-1.32.1
+1.32.2