Fix a bug where ratings were allowed to be set with less than 10 votes. Fixes bug #11294

This helps fix people trying to game the system.

docs/changelog/7.x.x.txt

@@ -3,6 +3,7 @@
  - fixed #11292: Search function limited to onje search?
  - fixed #11286: Workflow Instance deleted when reaching an Activity that fails to load
  - fixed #11296: listLDAPLinks op permissions problems
+ - fixed #11294: Matrix - Best/Worse Rated Calculations
 
 7.8.7
  - fixed #11278: Wrong test for Template::Toolkit in testEnvironment.pl

docs/upgrades/upgrade_7.8.7-7.8.8.pl

@@ -32,6 +32,7 @@ my $session = start(); # this line required
 
 # upgrade functions go here
 deleteFieldFromEMSSubmission($session);
+tenVoteMinimumForMatrixRatings($session);
 
 finish($session); # this line required
 
@@ -60,6 +61,15 @@ ENDSQL
     print "DONE!\n" unless $quiet;
 }
 
+#----------------------------------------------------------------------------
+# Describe what our function does
+sub tenVoteMinimumForMatrixRatings {
+    my $session = shift;
+    print "\tRestrict Matrix Listing Statistics to those with more than 10 ratings..." unless $quiet;
+    $session->db->write('update MatrixListing_ratingSummary set meanValue=0, medianValue=0 where countValue < 10');
+    print "\tDONE!\n" unless $quiet;
+}
+
 # -------------- DO NOT EDIT BELOW THIS LINE --------------------------------
 
 #----------------------------------------------------------------------------