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[Sébastien BEAU - http://www.akretion.com <sebastien.beau@xxxxxxxxxxxx>]

I made some test and for each read done an sql request is done. So it's
look like no cache is used, so it's better to read only the fields
needed.

@Jay thanks also for your reactivity.

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https://bugs.launchpad.net/bugs/731156

Title:
  [6.0] Useless read on product.product make openerp very slow

Status in Magento Open ERP Connector:
  New
Status in OpenERP Server:
  New

Bug description:
  Hi
  Two of my customers (who have maintenance contract) have some very bad performance when they open the product product menu.
  Actually they are using the V5 version but as I plan to migrate them, I start to work on the V6 performance. After some inspection I understand why opening the menu is so slow.
  Indeed when you try to read only one field (for example the price_list) by doing : product.price_list, the ORM launch a read request on all product fields (as my customers use Magento they can have more than 100 fields!!)

  
  You can reproduce this bug easily and without the module magentoerpconnect, you just have to install the module product

  Open the file server/bin/osv/orm.py line 2930 and add

      def read(self, cr, user, ids, fields=None, context=None, load='_classic_read'):
  +        print 'fields', fields
  +        if fields and 'produce_delay' in fields and len(fields)>2:
  +            print jkjkjk

  Restart the server and open the menu sale=>product=>product

  The server will raise an error 
  And here is the stack trace

  fields ['ean13', 'price_extra', 'default_code', 'name_template', 'active', 'variants', 'product_tmpl_id', 'price_margin', 'warranty', 'supply_method', 'uos_id', 'list_price', 'weight', 'standard_price', 'mes_type', 'uom_id', 'description_purchase', 'cost_method', 'uos_coeff', 'purchase_ok', 'product_manager', 'company_id', 'state', 'loc_rack', 'uom_po_id', 'type', 'loc_case', 'description', 'weight_net', 'volume', 'procure_method', 'loc_row', 'sale_ok', 'rental', 'sale_delay', 'name', 'description_sale', 'categ_id', 'produce_delay']
  [2011-03-08 10:25:07,903][product_bug] ERROR:web-services:Uncaught exception
  Traceback (most recent call last):
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/osv.py", line 122, in wrapper
      return f(self, dbname, *args, **kwargs)
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/osv.py", line 176, in execute
      res = self.execute_cr(cr, uid, obj, method, *args, **kw)
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/osv.py", line 167, in execute_cr
      return getattr(object, method)(cr, uid, *args, **kw)
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/orm.py", line 2944, in read
      result = self._read_flat(cr, user, select, fields, context, load)
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/orm.py", line 3064, in _read_flat
      res2 = self._columns[f].get(cr, self, ids, f, user, context=context, values=res)
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/fields.py", line 793, in get
      res = self._fnct(obj, cr, user, ids, name, self._arg, context)
    File "/home/sebastien/DEV/openerp/6.0/addons/product/product.py", line 419, in _product_lst_price
      res[product.id] = product.list_price
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/orm.py", line 292, in __getattr__
      return self[name]
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/orm.py", line 205, in __getitem__
      field_values = self._table.read(self._cr, self._uid, ids, field_names, context=self._context, load="_classic_write")
    File "/home/sebastien/DEV/openerp/6.0/server/bin/osv/orm.py", line 2932, in read
      print jkjkjk
  NameError: global name 'jkjkjk' is not defined

  
  As you can see when we try to read only one field 'list_price' the ORM will try to read this fields => 'ean13', 'price_extra', 'default_code', 'name_template', 'active', 'variants', 'product_tmpl_id', 'price_margin', 'warranty', 'supply_method', 'uos_id', 'list_price', 'weight', 'standard_price', 'mes_type', 'uom_id', 'description_purchase', 'cost_method', 'uos_coeff', 'purchase_ok', 'product_manager', 'company_id', 'state', 'loc_rack', 'uom_po_id', 'type', 'loc_case', 'description', 'weight_net', 'volume', 'procure_method', 'loc_row', 'sale_ok', 'rental', 'sale_delay', 'name', 'description_sale', 'categ_id', 'produce_delay'

  The problem is in the function def __getitem__(self, name): line 192
  (in the same file).

  if col._prefetch:
      # gen the list of "local" (ie not inherited) fields which are classic or many2one
      fields_to_fetch = filter(lambda x: x[1]._classic_write, self._table._columns.items())
      # gen the list of inherited fields
      inherits = map(lambda x: (x[0], x[1][2]), self._table._inherit_fields.items())
      # complete the field list with the inherited fields which are classic or many2one
      fields_to_fetch += filter(lambda x: x[1]._classic_write, inherits)
  # otherwise we fetch only that field
  else:
      fields_to_fetch = [(name, col)]

  If you add some print you will see that the value of "name" is
  'price_list' and the value of "col._prefetch" is 'True' and so all
  fields are added to the fields_to_fetch. Normally as we when to read
  only one field we have to execute the code "fields_to_fetch = [(name,
  col)]".

  Best Regards