In case of catalog methods where we have expression empty or None, trying to get
expression_instance raises an error. So, as to keep the compatibilty with how it
used to check for value of expression as shown in this diff :
nexedi/erp5@04f331a2
its better to check the same in mixin.

Before this change, expression_instance would not be set when expression is
modified, leading to either non-applied filter expression (when no
expression_instance existed) or use of an outdated expression.
Use a volatile attribute to store the expression: it does not change the
amount of work needed to load the Expression instance (pickle is the raw
python expression as text) and it remove data duplication in exported
documents.

reference has two meanings (now that it lost the "login" meaning):
- technical user identifier
- regular ERP5 document reference
This change moves the former to the new "user_id" property.
The latter remains in the "reference" property.

be needed to implement constraints in ZODB Property Sheets



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39337 20353a03-c40f-0410-a6d1-a30d3c3de9de

(locating in the second line only works when the first line is shebang comment.)


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31447 20353a03-c40f-0410-a6d1-a30d3c3de9de

 order to make optimisation configuration in unit test
- isIndexable is not a property any more, it is a ConstantGetter
 instance, so it works like a property and like a method
- same thing for isPredicate, isTemplate, isDelivery... we can
 start moving using only methods.
- do not define isTemplate, isDelivery... when it is already
  available thanks to inheritance
- new methods generated for all ERP5 objects : provides[InterfaceName].
 For instance, "providesIMovement()" will return True or False for
 any ERP5 object.
- new method "is[Group]Type" generated for all ERP5 objects. The group
 here is group of portal types (like getPortalDeliveryTypeList()). So
 on any ERP5 object, you can do "isDeliveryType()", and this will
 returns True or False.
- add tests

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@30704 20353a03-c40f-0410-a6d1-a30d3c3de9de

On the way to Zope 2.12, Reform imports, specially from Globals (replacing it with Products.ERP5Type.Globals on the products that depend on ERP5Type), convert Interface uses to zope.interfaces, and remove CMFMailIn references with blessings from Jerome.

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Remove unneeded executable flags.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@6280 20353a03-c40f-0410-a6d1-a30d3c3de9de

  instead of View.

(I ran some of the unit tests before comitting, and they reported no error)


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fixed Solanes typo


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