fix a few embarassing errors - export is working

app/controllers/maps_controller.rb

@@ -85,8 +85,8 @@ class MapsController < ApplicationController
                 respond_with(@allmappers, @allmappings, @allsynapses, @alltopics, @allmessages, @map)
             }
             format.json { render json: @map }
-            format.csv { redirect_to :export }
-            format.xls { redirect_to :export }
+            format.csv { redirect_to action: :export, format: :csv }
+            format.xls { redirect_to action: :export, format: :xls }
         end
     end
 
@@ -94,7 +94,7 @@ class MapsController < ApplicationController
     def export
       map = Map.find(params[:id])
       authorize map
-      exporter = MapExportService(current_user, map)
+      exporter = MapExportService.new(current_user, map)
       respond_to do |format|
         format.json { render json: exporter.json }
         format.csv { send_data exporter.csv }

app/policies/map_policy.rb

@@ -31,6 +31,10 @@ class MapPolicy < ApplicationPolicy
     record.permission == 'commons' || record.permission == 'public' || record.user == user
   end
 
+  def export?
+    show?
+  end
+
   def contains?
     show?
   end

app/services/map_export_service.rb

@@ -2,8 +2,8 @@ class MapExportService < Struct.new(:user, :map)
   def json
     # marshal_dump turns OpenStruct into a Hash
     {
-      topics: exportable_topics.map(:marshal_dump),
-      synapses: exportable_synapses.map(:marshal_dump)
+      topics: exportable_topics.map(&:marshal_dump),
+      synapses: exportable_synapses.map(&:marshal_dump)
     }
   end
 
@@ -29,9 +29,9 @@ class MapExportService < Struct.new(:user, :map)
   end
 
   def exportable_topics
-    visible_topics ||= Pundit.policy_scope!(@user, @map.topics)
+    visible_topics ||= Pundit.policy_scope!(user, map.topics)
     topic_mappings = Mapping.includes(mappable: [:metacode, :user])
-                            .where(mappable: visible_topics, map: @map)
+                            .where(mappable: visible_topics, map: map)
     topic_mappings.map do |mapping|
       topic = mapping.mappable
       OpenStruct.new(
@@ -49,7 +49,7 @@ class MapExportService < Struct.new(:user, :map)
   end
 
   def exportable_synapses
-    visible_synapses = Pundit.policy_scope!(@user, @map.synapses)
+    visible_synapses = Pundit.policy_scope!(user, map.synapses)
     visible_synapses.map do |synapse|
       OpenStruct.new(
         topic1: synapse.node1_id,
@@ -65,18 +65,18 @@ class MapExportService < Struct.new(:user, :map)
   def to_spreadsheet
     spreadsheet = []
     spreadsheet << ["Topics"]
-    spreadsheet << topic_headings.map(:capitalize)
+    spreadsheet << topic_headings.map(&:capitalize)
     exportable_topics.each do |topics|
       # convert exportable_topics into an array of arrays
-      topic_headings.map do { |h| topics.send(h) }
+      spreadsheet << topic_headings.map { |h| topics.send(h) }
     end
 
     spreadsheet << []
     spreadsheet << ["Synapses"]
-    spreadsheet << synapse_headings.map(:capitalize)
+    spreadsheet << synapse_headings.map(&:capitalize)
     exportable_synapses.each do |synapse|
       # convert exportable_synapses into an array of arrays
-      synapse_headings.map do { |h| synapse.send(h) }
+      spreadsheet << synapse_headings.map { |h| synapse.send(h) }
     end
 
     spreadsheet