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From "Jeff Potts (Created) (JIRA)" <>
Subject [jira] [Created] (CMIS-481) Cannot set a property to null
Date Thu, 01 Dec 2011 17:58:40 GMT
Cannot set a property to null

                 Key: CMIS-481
             Project: Chemistry
          Issue Type: Bug
          Components: python-cmislib
            Reporter: Jeff Potts
            Assignee: Jeff Potts
            Priority: Minor

Currently, when you create a props dict and use it with either createDocument or updateProperties,
the code tries to guess the appropriate cmis element name (cmis:propertyString, cmis:propertyDateTime,
etc.) by performing a type test on the value. It does not currently do a lookup to the type
definition to determine the property type (or even validate that the property name is defined
as part of the property).

Additionally, there is no specific check for None. So if you want to try to set a property
to null there is no way to do it. The code will treat properties set to None as a string.
If you happen to be setting a string prop, the value will be converted to the string "None".
If you happen to be setting any other data type, it is likely you'll see a runtime exception.

>>> doc = doc.updateProperties({'sc:level':None})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/src/chemistry/cmislib/src/cmislib/", line 1947, in updateProperties
  File "/opt/src/chemistry/cmislib/src/cmislib/", line 283, in put
  File "/opt/src/chemistry/cmislib/src/cmislib/", line 315, in _processCommonErrors
    raise RuntimeException(error.status, error.url)
cmislib.exceptions.RuntimeException: Error 500 at http://localhost:8080/alfresco/s/cmis/s/workspace:SpacesStore/i/4d783751-0a96-4b01-96a1-2b3e03d45d90
>>> doc = doc.updateProperties({'sc:difficulty':None})

In order to properly set a property to null, the code cannot rely on the type test. It will
have to do a lookup to the type definition so that it can figure out which cmis property element
name to use. As long as we're incurring the cost of the type definition lookup, we might as
well validate that the property is defined.

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