Add option to merge answers for summary

Interviews/Interview.cs

@@ -134,6 +134,10 @@ public class InterviewStep
     [JsonProperty("step-references")]
     public Dictionary<string, ReferencedInterviewStep> references = new();
 
+    // If set will merge answers with the delimiter, otherwise will overwrite
+    [JsonProperty("answer-delimiter")]
+    public string answerDelimiter;
+
     // Possible questions to ask next, an error message, or the end of the interview.
     [JsonProperty("steps")]
     public Dictionary<string, InterviewStep> steps = new();
@@ -203,8 +207,14 @@ public class InterviewStep
 
         if (!string.IsNullOrWhiteSpace(summaryField) && !string.IsNullOrWhiteSpace(answer))
         {
-            // TODO: Add option to merge answers
-            summary[summaryField] = answer;
+            if (answerDelimiter != null && summary.Contains(summaryField))
+            {
+                summary[summaryField] += answerDelimiter + answer;
+            }
+            else
+            {
+                summary[summaryField] = answer;
+            }
         }
 
         // This will always contain exactly one or zero children.
@@ -305,6 +315,7 @@ public class InterviewStep
             }
         }
 
+        // TODO: Warning for answer-delimiter if there is no summary-field
         // TODO: Add url button here when implemented
         if (messageType is MessageType.REFERENCE_END)
         {

Interviews/interview_template.schema.json

@@ -191,6 +191,11 @@
           "type": "boolean",
           "title": "Add Summary",
           "description": "This adds a summary field to the end of the message."
+        },
+        "answer-delimiter": {
+          "type": "string",
+          "title": "Answer Delimiter",
+          "description": "If the user has already answered a question with the same summary-field as this step the answer will be merged with the existing answer using this delimiter. If this is not set the old answer will be replaced by the new one."
         }
       },
       "required": [ "message-type" ],