switch to jsonb and make column nullable

Author: romanrizzi

app/models/ai_persona.rb

@@ -393,7 +393,7 @@ def allowed_seeded_model
 #  rag_llm_model_id             :bigint
 #  default_llm_id               :bigint
 #  question_consolidator_llm_id :bigint
-#  response_format              :json             not null
+#  response_format              :jsonb
 #
 # Indexes
 #

db/migrate/20250411121705_add_response_format_json_to_personass.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 class AddResponseFormatJsonToPersonass < ActiveRecord::Migration[7.2]
   def change
-    add_column :ai_personas, :response_format, :json, null: false, default: []
+    add_column :ai_personas, :response_format, :jsonb
   end
 end

lib/personas/bot.rb

@@ -311,10 +311,12 @@ def build_placeholder(summary, details, custom_raw: nil)
 
       def build_json_schema(response_format)
         properties =
-          response_format.reduce({}) do |memo, format|
-            memo[format[:key].to_sym] = { type: format[:type] }
-            memo
-          end
+          response_format
+            .to_a
+            .reduce({}) do |memo, format|
+              memo[format[:key].to_sym] = { type: format[:type] }
+              memo
+            end
 
         {
           type: "json_schema",

lib/personas/persona.rb

@@ -154,7 +154,7 @@ def options
       end
 
       def response_format
-        []
+        nil
       end
 
       def available_tools