diff app/models/query.rb @ 245:051f544170fe

* Update to SVN trunk revision 4993

--- a/app/models/query.rb	Thu Mar 03 11:40:10 2011 +0000
+++ b/app/models/query.rb	Thu Mar 03 11:42:28 2011 +0000
@@ -566,9 +566,19 @@
     sql = ''
     case operator
     when "="
-      sql = "#{db_table}.#{db_field} IN (" + value.collect{|val| "'#{connection.quote_string(val)}'"}.join(",") + ")"
+      if value.any?
+        sql = "#{db_table}.#{db_field} IN (" + value.collect{|val| "'#{connection.quote_string(val)}'"}.join(",") + ")"
+      else
+        # IN an empty set
+        sql = "1=0"
+      end
     when "!"
-      sql = "(#{db_table}.#{db_field} IS NULL OR #{db_table}.#{db_field} NOT IN (" + value.collect{|val| "'#{connection.quote_string(val)}'"}.join(",") + "))"
+      if value.any?
+        sql = "(#{db_table}.#{db_field} IS NULL OR #{db_table}.#{db_field} NOT IN (" + value.collect{|val| "'#{connection.quote_string(val)}'"}.join(",") + "))"
+      else
+        # NOT IN an empty set
+        sql = "1=1"
+      end
     when "!*"
       sql = "#{db_table}.#{db_field} IS NULL"
       sql << " OR #{db_table}.#{db_field} = ''" if is_custom_filter