[SOLVED] unicode' object has no attribute 'items'

I am updating the document in solr using pysolr python. I am taking one field data from solr document and after updating it i am ingesting it again using

solr.add(dict)

Basically i am ingesting a dictionary in solr again. However i am getting this error :

  File "/usr/local/lib/python2.7/dist-packages/pysolr.py", line 907, in add
    el = self._build_doc(doc, boost=boost, fieldUpdates=fieldUpdates)
  File "/usr/local/lib/python2.7/dist-packages/pysolr.py", line 822, in _build_doc
    for key, value in doc.items():
AttributeError: 'unicode' object has no attribute 'items'