set_time_zone

gistfile1.rb

#1 .ApplicationController

class ApplicationController < ActionController::Base

  around_filter :set_time_zone

    def set_time_zone(&block)
      time_zone = current_user.shop.try(:timezone) || 'UTC'
      Time.use_zone(time_zone, &block)
    end
    
end



#2. Generate migration
class AddTimezoneToShops < ActiveRecord::Migration
  def change
    add_column :shops, :timezone, :string, :default => 'Europe/Athens'
  end
end




#3. Set a form


<div class="form-group">
    <%= f.label :timezone, :class => "col-lg-2 control-label" %>
    <div class="col-lg-10">
		<%= f.input :timezone, :collection => Timezone::Zone.names, :label => false ,:include_blank => false,
	  :class => "form-control" %>
    </div>
  </div>