Fivell

# This file extends and overrides parts of the ActiveAdmin DSL and internals
# in order to provide support for automatically displaying and editing images,
# which in our infrastructure are stored as URLs whose column names end in "img".
# Since this file will be reloaded frequently in the development environment,
# all operations done at load time (class_eval's, etc.) MUST be idempotent.

ActiveAdmin::Views::TableFor.class_eval do

  def img_column(col_sym=:img, title="Image")
    column title, sortable: false do |obj|

Fivell

module ActiveAdminHelper

  def admin_arbre_context
    @admin_arbre_context ||= Arbre::Context.new(assigns, self)
  end

  def default_renderer
    case controller.send(:resource_class).name
    when "ActiveAdmin::Page"
      "page"

Fivell

Saving ActiveAdmin filters between requests

This shows one technique for preserving filters on index pages for ActiveAdmin resources, without having to patch the ActiveAdmin core.

It restores any previously-used filters whenever the index page is rendered for a resource, unless the current request is an actual application of new filters. It also properly handles the clear-filters button (via a synchronous Ajax request that happens immediately before the normal filter form processing).

Yes, it's a bit of a hack, but it has worked well for me so far.

Usage

Fivell

module DefaultValues

  def has_default_values(default_values = {})

    class_attribute :default_values
    self.default_values = default_values

    after_initialize :assign_default_values

    include InstanceMethods

Fivell

# psql -U postgres
psql (9.3.4)
Type "help" for help.

postgres=# CREATE FUNCTION insert_city(character varying)
postgres-#   RETURNS void AS
postgres-# $BODY$
postgres$# BEGIN
postgres$#  INSERT INTO city("name") VALUES($1);
postgres$# END

Fivell

 rescue_from StandardError, :with => :notify_exception

  def notify_exception(e)
    ActionMailer::Base.mail(:from => "application@email.com", :to => "developer@email.com",
                            :subject => e.message,
                            :body => [e.backtrace.join("\n"), self.request.inspect].join("\n\n\n")).deliver
    raise e
  end

Fivell

# db/migrations/20120118012543_create_site_configuration.rb

class CreateSiteConfigurations < ActiveRecord::Migration
  def change
    create_table :site_configurations do |t|
      t.string  :key
      t.text    :value
      t.string  :form_type
      t.string  :form_collection_command

Fivell

module ActiveAdmin
    
  module Reports    
    module DSL
      def enable_reports
        action_item only: :index do
          link_to("Download", {action: :report, params: params}, {method: :post, data: { confirm: "Are you sure you want to generate this report?"}})
        end
  
        collection_action :report, method: :post do

Fivell

# if you want to monkey patch every controller, put this in initializers/active_admin.rb
ActiveAdmin::ResourceController.class_eval do
  include ActiveAdmin::CSVStream
end

Fivell

require 'rubygems'
require 'rubygems/package'
require 'zlib'
require 'fileutils'

module Util
  module Tar
    # Creates a tar file in memory recursively
    # from the given path.
    #