Add CSV download for User

app/controllers/admin/users_controller.rb

@@ -5,6 +5,10 @@ class Admin::UsersController < Admin::BaseController
     @users = params[:show_deleted] ? User.deleted : User.undeleted
     @users = @users.includes(:mail_delivery_status)
 
+    if request.format.csv?
+      send_data UsersCsv.new(@users).to_csv, filename: 'users.csv', type: 'text/csv'
+    end
+
     # if somebody uses the search field:
     @users = @users.natural_search(params[:user_name]) unless params[:user_name].blank?
 

app/views/admin/users/index.html.haml

@@ -2,6 +2,9 @@
 
 - content_for :actionbar do
   = link_to t('.new_user'), new_admin_user_path, class: 'btn btn-primary'
+  = link_to url_for(search: params[:q], format: :csv), class: 'btn' do
+    = glyph :download
+    CSV
 
 - content_for :sidebar do
   %p= t('.first_paragraph', url: link_to(t('.new_users'), new_admin_user_path)).html_safe

lib/users_csv.rb

@@ -0,0 +1,39 @@
+class UsersCsv < RenderCSV
+  include ApplicationHelper
+
+  def header
+    row = [
+      User.human_attribute_name(:id),
+      User.human_attribute_name(:name),
+      User.human_attribute_name(:nick),
+      User.human_attribute_name(:first_name),
+      User.human_attribute_name(:last_name),
+      User.human_attribute_name(:email),
+      User.human_attribute_name(:phone),
+      User.human_attribute_name(:last_login),
+      User.human_attribute_name(:last_activity),
+      User.human_attribute_name(:iban),
+      User.human_attribute_name(:ordergroup)
+    ]
+    row + User.custom_fields.pluck(:label)
+  end
+
+  def data
+    @object.each do |o|
+      row = [
+        o.id,
+        o.name,
+        o.nick,
+        o.first_name,
+        o.last_name,
+        o.email,
+        o.phone,
+        o.last_login,
+        o.last_activity,
+        o.iban,
+        o.ordergroup&.name
+      ]
+      yield row + User.custom_fields.map { |f| o.settings.custom_fields[f[:name]] }
+    end
+  end
+end