correctly tidy an empty result

Author: jazzido

Diff for: lib/mondrian_rest/api_formatters.rb

@@ -11,11 +11,17 @@ module Mondrian::REST::Formatters
   # Generate 'tidy data' (http://vita.had.co.nz/papers/tidy-data.pdf)
   # from a result set.
   def self.tidy(result, options)
+
     cube = result.cube
 
     add_parents = options[:add_parents]
     properties = options[:properties]
     rs = result.to_h(add_parents, options[:debug])
+
+    if rs[:values].empty?
+      return []
+    end
+
     measures = rs[:axes].first[:members]
     dimensions = rs[:axis_dimensions][1..-1]
     columns = []

Diff for: spec/api_spec.rb

@@ -297,8 +297,14 @@ def app
 
       expect(JSON.parse(last_response.body)['values'].size).to eql(0)
 
-    end
+      get '/cubes/Warehouse/aggregate.jsonrecords?drilldown[]=[Store+Type].[Store+Type]&cut[]=[Store].[Store].[Store+Country].%26[Mexico]&measures[]=Store+Invoice&nonempty=true&distinct=false&parents=false&debug=true'
+
+      expect(JSON.parse(last_response.body)).to eql({"data" => []})
 
+      get '/cubes/Warehouse/aggregate.csv?drilldown[]=[Store+Type].[Store+Type]&cut[]=[Store].[Store].[Store+Country].%26[Mexico]&measures[]=Store+Invoice&nonempty=true&distinct=false&parents=false&debug=true'
+
+      expect(last_response.body).to eql("")
+    end
   end
 end