How to config export property db.ListProperty(db.Key) in bulkloader

Question

I started to export data from Google AppEngine with bulkLoader, configured in bulkloader.yaml. For "standard" data likes string, int and bool this is no problem. Even single keys are exported easily.

Now I have some data db.ListProperty(db.Keys) and the export fails. In export_transform I tried, see ??? in bulkloader_config.yaml below:

transform.key_id_or_name_as_string
transform.create_deep_key(('Coupon', db.Key))
join_list(",")
and many other from http://googleappengine.googlecode.com/svn/trunk/python/google/appengine/ext/bulkload/transform.py

Any idea how to export the list of keys?

datamodel.py

    class Receipt(db.Model):
    coupons = db.ListProperty(db.Key) # only coupon ids of approved coupons

bulkloader_config.yaml

    - kind: Receipt
      connector: csv
      connector_options:
        columns: from_header
      property_map:
        - property: __key__
          export_transform: transform.key_id_or_name_as_string
        - property: coupons
          import_transform: transform.create_foreign_key('Coupon')
          export_transform: transform.???

... export_transform: transform.key_id_or_name_as_string ???? — Jimmy Kane, Jan 11 '13 at 14:36
this is the part where it gets interesting. transform.??? are the methods that deal with the property, transform or not and throw the error message — skurt, Jan 11 '13 at 15:49

score 0 · Accepted Answer · answered Jan 13 '13 at 13:13

0

I have to do a little hack but it works

  def prop_name_converter(obj):
    if not obj:
      return ''
    str_list = []
    for o in obj:
      str_list.append(`o`)
    return ''.join(str_list)

answered Jan 13 '13 at 13:13

skurt

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How to config export property db.ListProperty(db.Key) in bulkloader

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