add flag main field for element

@@ -92,9 +92,15 @@ module Kanjai
       end
 
       @type_contents = []
+      @main_field = []
 
       if page_template = @page_data.page.page_template
         @type_contents += page_template.template_parts.where("part_type in ('content')").collect{|p| [p.name, p.code] }
+        page_template.template_parts.where("part_type in ('content')").each do |item|
+          item.field_options.each do |el|
+            @main_field << el[:name] if el[:mail].to_i == 1
+          end
+        end
       end
 
       @type_contents.sort!{|x,y| x[0] <=> y[0]}

@@ -51,7 +51,7 @@
 
 
     <% end %>
-
+    <%= @main_field %>
     <% row_items = @obj.page_content_markers.select{|item| item.row_item.to_i > 0}.collect(&:row_item).uniq %>
     <%  repeat_element = template_part.field_options.select{|item| item[:name] == 'repeat' }.first %>
 

 module Kanjai
-  VERSION = "0.0.112"
+  VERSION = "0.0.113"
 end