danishkhan

MongoDB Notes

Building Web Apps with MongoDB

• MapReduce is a two step process
  • reduce function takes output of maps and collections and aggregates then gives you it in a collection
  • http://www.mongodb.org/display/DOCS/MapReduce

MongoDB Schema Design

danishkhan

** Invoke release (first_time)
** Execute release
rake aborted!
undefined method `grep' for "engineyard-serverside-adapter (1.4.0)\n":String
/Users/danishkhan/Projects/engineyard/Rakefile:40:in `bump_serverside_adapter'
/Users/danishkhan/Projects/engineyard/Rakefile:76:in `block in <top (required)>'
/Users/danishkhan/.rvm/gems/ruby-1.9.2-p136@global/gems/rake-0.8.7/lib/rake.rb:636:in `call'
/Users/danishkhan/.rvm/gems/ruby-1.9.2-p136@global/gems/rake-0.8.7/lib/rake.rb:636:in `block in execute'
/Users/danishkhan/.rvm/gems/ruby-1.9.2-p136@global/gems/rake-0.8.7/lib/rake.rb:631:in `each'
/Users/danishkhan/.rvm/gems/ruby-1.9.2-p136@global/gems/rake-0.8.7/lib/rake.rb:631:in `execute'

danishkhan

OVERWRITE=true ADMIN_NAME=admin ADMIN_USERNAME=admin ADMIN_PASSWORD=eypass DATABASE_TEMPLATE=styled-blog.yml rake db:bootstrap

danishkhan

We couldn’t find that file to show.

danishkhan

class SalesController < ApplicationController
  include CsvMapper

  def csv_import
    results = CsvMapper.import(params[:dump][:file].original_filename) do
      map_to Sale
      after_row lambda{|row, sale| sale.save }

      start_at_row 1
      [start_date, country]