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ROR Error message
@supplier_store_array = PurchaseIndentDetail.find(:all,:conditions =>
 "pid.recommended_for = 'PO' and pid.purchase_order_detail_id is null and
 pi.approved_status='Approved' and (pi.amendment_status = 'Approved' or
 pi.amendment_status is null or pi.amendment_status = 'None') and i.is_asset = '0'",
 :joins => "as pid inner join purchase_indents as pi on
 pi.id=pid.purchase_indent_id inner join items as i on pid.item_id=i.id",
 :select => "pid.*").inject([]){|acc,pid|

 ih = pid.item.item_subtype.item_type.item_group.store_category.inventory_heads
     .find(:first, :conditions => ["location_id = ?",
     Location.find(:first, :conditions => ["is_central = true"]).id])

 item_inventory_head_id = ih ? ih.id : pid.item.item_subtype.item_type.item_group
                                      .store_category.inventory_heads[0].id


 acc.include?([pid.supplier_id, item_inventory_head_id]) ?
 acc : acc << [pid.supplier_id, item_inventory_head_id]
}

if ih.nil?
  raise 'some error'
end

class MyException < Exception
end

if ih.nil?
  raise MyException.new
end

rescue_from MyException do
  render :template => 'my_exception_happened'
end