server/AyaNova/DataList/DataListSqlFilterCriteriaBuilder.cs

@@ -948,10 +948,37 @@ namespace AyaNova.DataList
 
             This method and choices ensures users don't need to make a separate row for each one they can just treat the entire tag collection like they treat a single word match in a text field
             */
+
+            //HAS VALUE / NO VALUE
+            if (sValue == "*NULL*")
+            {
+                if (sOperator == DataListFilterComparisonOperator.Equality)
+                    return $"{SqlColumnNameToFilter} = '{{}}'";
+                else
+                    return $"{SqlColumnNameToFilter} <> '{{}}'";
+            }
+            else
+            {
+                string PostgresTagArrayFragment = string.Empty;
+                //Filter ui builder allows multiple tag selection just like any other tag selection and sends the filter to the server like this:
+                //filter	"[{\"column\":\"customertags\",\"any\":false,\"items\":[{\"op\":\"=\",\"value\":\"completed.reminder,burnaby.dispatchzone,cabling-fibre.user-skill\"}]}]"
+                //needs to be "ARRAY['red','green'::varchar(255)]"
+                StringBuilder sbTemp = new StringBuilder();
+                sbTemp = sbTemp.Append("ARRAY[");
+                List<string> normalizedTags = TagBiz.NormalizeTags(sValue.Split(',').ToList<string>());
+                if (normalizedTags.Count == 0)                
+                    throw new System.ArgumentNullException("DataListSqlFilterCriteriaBuilder::TagDataFilterToColumnCriteria - NO tags were provided for filtering");
+                
+                foreach (string s in normalizedTags)
+                    sbTemp.Append($"'{s}',");
+                PostgresTagArrayFragment = sbTemp.ToString().TrimEnd(',');
+                PostgresTagArrayFragment += "::VARCHAR(255)]";
+
                 switch (sOperator)
                 {
                     case DataListFilterComparisonOperator.Equality:
                         {
+                            //WHERE ARRAY['green'::varchar(255)] <@ tags and  array_length(tags,1) = 1 
                             StringBuilder sbTags = new StringBuilder();
                             sbTags.Append("@> array[");
                             //Note: with listOptions change to split filter and view the tags are now in sValue as a string of comma delimited strings so split them out here
@@ -990,21 +1017,10 @@ namespace AyaNova.DataList
 
                 }
 
-            //NOTE: tag filter OPERATOR is ignored, query matches if all tags are found in a tag collection that could have other tags as well
-
-            //for initial release a tag filter is inclusive of all tags only
-            //in other words all tags presented must be in record to match (simple AND)
-            //select * from awidget where awidget.tags @> array['blah','blah3'::varchar(255)]
-
-            //NOTE: After coding this discovered *can* do a LIKE query with tags like this:
-            //(array_to_string(awidget.tags,',') like '%zo%')
-            //implemented that way in picklistquery builder
-            //also ilike is a postgres case insensitive like but works on current locale of server which 
-            //sounds like it might fuck up when using other languages so...
-
 
 
 
+            }
             return sb.ToString();