Fixed django#14886 -- Added wms_options dict to GeoModelAdmin.

It is now possible to set WMS options by overriding wms_options
in a subclass of GeoModelAdmin.
Thanks slinkp for the report and the initial patch.

django/contrib/gis/admin/options.py

@@ -36,6 +36,7 @@ class GeoModelAdmin(ModelAdmin):
     wms_url = 'http://vmap0.tiles.osgeo.org/wms/vmap0'
     wms_layer = 'basic'
     wms_name = 'OpenLayers WMS'
+    wms_options = {'format': 'image/jpeg'}
     debug = False
     widget = OpenLayersWidget
 
@@ -76,6 +77,12 @@ def get_map_widget(self, db_field):
         class OLMap(self.widget):
             template = self.map_template
             geom_type = db_field.geom_type
+
+            wms_options = ''
+            if self.wms_options:
+                wms_options = ["%s: '%s'" % pair for pair in self.wms_options.items()]
+                wms_options = ', %s' % ', '.join(wms_options)
+
             params = {'default_lon' : self.default_lon,
                       'default_lat' : self.default_lat,
                       'default_zoom' : self.default_zoom,
@@ -106,6 +113,7 @@ class OLMap(self.widget):
                       'wms_url' : self.wms_url,
                       'wms_layer' : self.wms_layer,
                       'wms_name' : self.wms_name,
+                      'wms_options' : wms_options,
                       'debug' : self.debug,
                       }
         return OLMap

django/contrib/gis/templates/gis/admin/openlayers.js

@@ -111,7 +111,7 @@ OpenLayers.Projection.addTransform("EPSG:4326", "EPSG:3857", OpenLayers.Layer.Sp
     // The admin map for this geometry field.
     {{ module }}.map = new OpenLayers.Map('{{ id }}_map', options);
     // Base Layer
-    {{ module }}.layers.base = {% block base_layer %}new OpenLayers.Layer.WMS( "{{ wms_name }}", "{{ wms_url }}", {layers: '{{ wms_layer }}'} );{% endblock %}
+    {{ module }}.layers.base = {% block base_layer %}new OpenLayers.Layer.WMS("{{ wms_name }}", "{{ wms_url }}", {layers: '{{ wms_layer }}'{{ wms_options|safe }}});{% endblock %}
     {{ module }}.map.addLayer({{ module }}.layers.base);
     {% block extra_layers %}{% endblock %}
     {% if is_linestring %}OpenLayers.Feature.Vector.style["default"]["strokeWidth"] = 3; // Default too thin for linestrings. {% endif %}

django/contrib/gis/tests/geoadmin/tests.py

@@ -2,6 +2,7 @@
 
 from django.test import TestCase
 from django.contrib.gis import admin
+from django.contrib.gis.geos import Point
 
 from .models import City
 
@@ -14,3 +15,21 @@ def test01_ensure_geographic_media(self):
         admin_js = geoadmin.media.render_js()
         self.assertTrue(any([geoadmin.openlayers_url in js for js in admin_js]))
 
+    def test_olmap_OSM_rendering(self):
+        geoadmin = admin.site._registry[City]
+        result = geoadmin.get_map_widget(City._meta.get_field('point'))(
+            ).render('point', Point(-79.460734, 40.18476))
+        self.assertIn(
+            """geodjango_point.layers.base = new OpenLayers.Layer.OSM("OpenStreetMap (Mapnik)");""",
+            result)
+
+    def test_olmap_WMS_rendering(self):
+        admin.site.unregister(City)
+        admin.site.register(City, admin.GeoModelAdmin)
+
+        geoadmin = admin.site._registry[City]
+        result = geoadmin.get_map_widget(City._meta.get_field('point'))(
+            ).render('point', Point(-79.460734, 40.18476))
+        self.assertIn(
+            """geodjango_point.layers.base = new OpenLayers.Layer.WMS("OpenLayers WMS", "http://labs.metacarta.com/wms/vmap0", {layers: \'basic\', format: 'image/jpeg'});""",
+            result)