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[Jay Lau <jay.lau.513@xxxxxxxxx>]

Public bug reported:

I was trying to add a json field to DB but forget to dumps the json to
string, and nova api report the following error.

2013-12-17 12:37:51.615 TRACE object Traceback (most recent call last):
2013-12-17 12:37:51.615 TRACE object   File "/opt/stack/nova/nova/objects/base.py", line 70, in setter
2013-12-17 12:37:51.615 TRACE object     field.coerce(self, name, value))
2013-12-17 12:37:51.615 TRACE object   File "/opt/stack/nova/nova/objects/fields.py", line 166, in coerce
2013-12-17 12:37:51.615 TRACE object     return self._type.coerce(obj, attr, value)
2013-12-17 12:37:51.615 TRACE object   File "/opt/stack/nova/nova/objects/fields.py", line 218, in coerce
2013-12-17 12:37:51.615 TRACE object     raise ValueError(_('A string is required here, not %s'),
2013-12-17 12:37:51.615 TRACE object ValueError: (u'A string is required here, not %s', 'dict') <<<<<<<<<<<

The error should be <string is required here, not dict>

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1261621

Title:
  nova api value error is not right

Status in OpenStack Compute (Nova):
  New

Bug description:
  I was trying to add a json field to DB but forget to dumps the json to
  string, and nova api report the following error.

  2013-12-17 12:37:51.615 TRACE object Traceback (most recent call last):
  2013-12-17 12:37:51.615 TRACE object   File "/opt/stack/nova/nova/objects/base.py", line 70, in setter
  2013-12-17 12:37:51.615 TRACE object     field.coerce(self, name, value))
  2013-12-17 12:37:51.615 TRACE object   File "/opt/stack/nova/nova/objects/fields.py", line 166, in coerce
  2013-12-17 12:37:51.615 TRACE object     return self._type.coerce(obj, attr, value)
  2013-12-17 12:37:51.615 TRACE object   File "/opt/stack/nova/nova/objects/fields.py", line 218, in coerce
  2013-12-17 12:37:51.615 TRACE object     raise ValueError(_('A string is required here, not %s'),
  2013-12-17 12:37:51.615 TRACE object ValueError: (u'A string is required here, not %s', 'dict') <<<<<<<<<<<

  The error should be <string is required here, not dict>

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