I'm using Postgresql, with the pg8000 adapter.

One of the fields I have is of 'json' type

        Field('json_string','json'),


And each time I restart the web2py server, this error will show one time. 
Refreshing the page the second time makes it go away:

ProgrammingError: (u'ERROR', u'ERROR', u'42804', u'column "json_string__tmp" is 
of type json but expression is of type text', u'You will need to rewrite or 
cast the expression.', u'48', u'parse_target.c', u'540', 
u'transformAssignedExpr', u'', u'')


I checked the db itself and the schema says:
Column = json_string
Type = text

So I did a search and manually altered the type to JSON. After restart, no 
errors! It was good.
BUT... subsequent restarting of the server brought back the error. So I 
checked the db again and the Type is changed back to 'text' again










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