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fix released on revision 5057
revid:fp@xxxxxxxxxxx-20110917142602-vo8pl5dpqp82e4z0

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https://bugs.launchpad.net/bugs/809745

Title:
  Document module migration of "url" attachments

Status in OpenERP Addons (modules):
  Fix Released

Bug description:
  Hello,

  On trunk (same problem in stable 6):
  In the document module, in document.py there is a method _attach_parent_id to migrate documents on the installation of the module.

  The query :
  cr.execute("UPDATE ir_attachment SET file_size=length(db_datas) WHERE file_size = 0;")
  will work only for attachments of type "binary", for those one of type "url" it will raise a not null constraint error and block the module installation :
  ERROR:  null value in column "file_size" violates not-null constraint
  Because length() of an empty column returns null.

  To fix, replace the query by:
  cr.execute("UPDATE ir_attachment SET file_size=length(db_datas) WHERE file_size = 0 and type = 'binary';")

  Thanks
  Regards
  Guewen

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