Pack up functionality done

app/controllers/gangs_controller.rb

@@ -1,4 +1,7 @@
 class GangsController < ApplicationController
+  include ActionController::MimeResponds
+  before_action :set_gang, only: [:update, :backup]
+
   def index
     json_response Gang.all
   rescue StandardError
@@ -18,19 +21,40 @@ class GangsController < ApplicationController
   end
 
   def update
-    if params[:id]
-      gang = Gang.find(params[:id])
-      gang.update!(gang_params)
+      @gang.update!(gang_params)
       json_response onboarded: true
-    else
-      error_response :bad_request
-    end
-  rescue StandardError
+  rescue StandardError => err
+    Rails.logger.error(err)
     error_response :bad_request
   end
 
+  def backup
+    csv_string = CSV.generate do |csv|
+      csv << [:homie_name, :money_amount, :work_amount, :description, :date, :deleted]
+      @gang.money_moves.each do |money_move|
+        csv << money_move.to_csv_row
+      end
+
+      @gang.works.each do |work|
+        csv << work.to_csv_row
+      end
+    end
+    send_data csv_string
+  end
+
   private
 
+  def set_gang
+    if params[:gang_id] || params[:id] 
+      @gang = Gang.find(params[:id] || params[:gang_id])
+    else 
+      error_response :bad_request
+    end
+  rescue StandardError => err
+    Rails.logger.error(err)
+    error_response :bad_request
+  end
+
   def gang_params
     params.require(:gang).permit :name,
                                  :about,