geojson formatting for printing

Author: jkraemer

lib/redmine_gtt/patches/geojson_attribute.rb

@@ -63,6 +63,25 @@ def geojson
                      end
       end
 
+      # returns a hash with two values:
+      # :geojson  is the feature with coordinates transformed to EPS 3857
+      # :center   is the geometric center of the geometry as computed by
+      #           ST_Centroid, in EPS 3857 as well.
+      #
+      # TODO for printing of multiple issues this should be optimized to avoid
+      # doing a single select for each issue
+      def geodata_for_print
+        if row = self.class.where(id: id).where.not(geom: nil).
+                   pluck("ST_AsGeoJson(ST_Transform(geom, 3857)) as geojson, ST_Transform(ST_Centroid(geom), 3857) as center").
+                   first
+          json, center = *row
+          {
+            geojson: Conversions.to_feature(json),
+            center: [center.x, center.y]
+          }
+        end
+      end
+
       # sets the geojson attribute for reading / writing to the DB
       def geojson=(geometry)
         @geojson = geometry

test/test_helper.rb

@@ -1,19 +1,22 @@
 # Load the Redmine helper
 require File.expand_path(File.dirname(__FILE__) + '/../../../test/test_helper')
 
-class GttTest < ActiveSupport::TestCase
+module GttTestData
+  def test_geojson
+    {'type'=>'Feature','geometry'=>{ 'type'=>'Polygon','coordinates'=> test_coordinates}}.to_json
+  end
 
   def test_coordinates
     [[[135.220734222412,34.7056906000311],[135.302273376465,34.6990600142143],[135.300041778564,34.6709699843709],[135.252834899902,34.6760523038894],[135.194212539673,34.6766840435102],[135.220734222412,34.7056906000311]]]
   end
 
-  def test_geojson
-    {'type'=>'Feature','geometry'=>{ 'type'=>'Polygon','coordinates'=> test_coordinates}}.to_json
-  end
-
   def test_geom
     RedmineGtt::Conversions::WkbToGeom.("01030000000100000006000000C84B374110E76040381DD011545A4140C84B3739ACE96040F07E6DCC7A594140C84B37F199E960403CBC2D58E2554140C84B373917E8604098CBC3E188564140C84B37FD36E66040F24C2E959D564140C84B374110E76040381DD011545A4140")
   end
+end
+
+class GttTest < ActiveSupport::TestCase
+  include GttTestData
 
   def assert_geojson(json)
     json = JSON.parse json if json.is_a?(String)

test/unit/issue_test.rb

@@ -28,6 +28,15 @@ class IssueTest < GttTest
     assert_geojson @issue.geojson
   end
 
+  test 'should have geojson for print' do
+    assert d = @issue.geodata_for_print
+    assert center = d[:center]
+    assert_equal 2, center.size
+    assert geom = d[:geojson]['geometry']
+    assert coords = geom['coordinates']
+    assert_equal 15052703.2783315, coords.flatten.first
+  end
+
   test 'should render properties in as_geojson' do
     j = @issue.as_geojson include_properties: true
     assert_geojson j