fix: 导出支持 headers 传入

lib/tallty_import_export/export.rb

@@ -28,7 +28,7 @@ module TalltyImportExport
 
     def export_xlsx records, **options
       records = with_scope records
-      exportable_defaults(options)
+      process_options(options)
 
       options = options.with_indifferent_access
 
@@ -90,7 +90,7 @@ module TalltyImportExport
       end
     end
 
-    def exportable_defaults options = {}
+    def process_options options = {}
       options = options.with_indifferent_access
 
       @row_height ||= options.delete(:row_height) || 35
@@ -98,16 +98,13 @@ module TalltyImportExport
       @filename ||= options.delete(:filename)
       @group_by ||= options.delete(:group_by)
       @group_where = "#{@group_by}_eq" if @group_by.present?
+      @headers ||= options.delete(:headers)
     end
 
     def with_scope records
       records
     end
 
-    def headers= val
-      @headers = val.map { |header| header.with_indifferent_access }
-    end
-
     def export_headers
       @headers || klass.try(:headers) || klass.try(:model_headers)
     end