154 # XXX:  store a reference to the AnyEntity class since it is hijacked in goa

   154 def fetch_config(fetchattrs, mainattr=None, pclass=AnyEntity, order='ASC'):

   155 #       configuration and we need the actual reference to avoid infinite loops

   155     """function to ease basic configuration of an entity class ORM. Basic usage

   156 #       in mro

   156     is:

   157 ANYENTITY = AnyEntity

   159 def fetch_config(fetchattrs, mainattr=None, pclass=AnyEntity, order='ASC'):

   158     .. sourcecode:: python

   160     if pclass is ANYENTITY:

   159 

   161         pclass = AnyEntity # AnyEntity and ANYENTITY may be different classes

   160       class MyEntity(AnyEntity):

   161 

   162           fetch_attrs, cw_fetch_order = fetch_config(['attr1', 'attr2'])

   163           # uncomment line below if you want the same sorting for 'unrelated' entities

   164           # cw_fetch_unrelated_order = cw_fetch_order

   165 

   166     Using this, when using ORM methods retrieving this type of entity, 'attr1'

   167     and 'attr2' will be automatically prefetched and results will be sorted on

   168     'attr1' ascending (ie the first attribute in the list).

   169 

   170     This function will automatically add to fetched attributes those defined in

   171     parent class given using the `pclass` argument.

   172 

   173     Also, You can use `mainattr` and `order` argument to have a different

   174     sorting.

   175     """

   167     def fetch_order(cls, attr, var):

   181     def fetch_order(cls, select, attr, var):

   169             return '%s %s' % (var, order)

   183             select.add_sort_var(var, order=='ASC')

   170         return None