allow an options hash to be passed to BlacklightMaps::GeojsonExport.new

app/helpers/blacklight/blacklight_maps_helper_behavior.rb

@@ -88,10 +88,11 @@ def render_spatial_search_link coordinates
   end
 
   # pass the document or facet values to BlacklightMaps::GeojsonExport
-  def serialize_geojson(documents)
+  def serialize_geojson(documents, options={})
     export = BlacklightMaps::GeojsonExport.new(controller,
                                                controller.action_name,
-                                               documents)
+                                               documents,
+                                               options)
     export.to_geojson
   end
 

lib/blacklight/maps/export.rb

@@ -13,10 +13,12 @@ class GeojsonExport
     # response_docs is passed by a helper, and is either:
     #  - index view, map view: an array of facet values
     #  - show view: the document object
-    def initialize(controller, action, response_docs)
+    # options is an optional hash of possible configuration options
+    def initialize(controller, action, response_docs, options={})
       @controller = controller
       @action = action
       @response_docs = response_docs
+      @options = options
     end
 
     # build the GeoJSON FeatureCollection

spec/lib/blacklight/maps/export_spec.rb

@@ -14,7 +14,7 @@
 
   # TODO: use @response.facet_by_field_name('geojson').items instead of @response
   #       then refactor build_geojson_features and to_geojson specs
-  subject {BlacklightMaps::GeojsonExport.new(@controller, @action, @response.docs)}
+  subject {BlacklightMaps::GeojsonExport.new(@controller, @action, @response.docs, {foo:'bar'})}
 
   it "should instantiate GeojsonExport" do
     expect(subject.class).to eq(::BlacklightMaps::GeojsonExport)
@@ -46,6 +46,10 @@
       expect(subject.send(:placename_property)).to eq('placename')
     end
 
+    it "should create an @options instance variable" do
+      expect(subject.instance_variable_get("@options")[:foo]).to eq('bar')
+    end
+
   end
 
   describe "build_feature_from_geojson" do