I came up with a first version that works:
def operator_field_starts(field, first_int, query_env={}):
'''bla bla
'''
if not field.type.startswith('list:'):
raise AttributeError, "bla bla bla"
dialect = field._dialect
arg = '|'+dialect._like_escaper_default(str(first_int))+'|%'
op = dialect.like
return op(field, arg, escape='\\', query_env=query_env)
from pydal.objects import Query
def field_starts(field, first_int):
db = field._db
return Query(db, operator_field_starts, field, first_int)
and then it is used like this:
db( field_starts(db.operation.parameters, my_parameter) & (db.operation.
canceled==True))._count()
I feel it would be more efficient to use SUBSTR instead of LIKE, so I'll go
for a second version...
Regards
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