Handling missing fields when using Python lambda's

Question

I have this rethinkDB query which basically returns the documents which "basicConstraints" fields that start with "CA:FA".

However in some of my documents the "basicConstraints" field does not exist.

q = r.db('scanafi').table(active_table) \
.concat_map(lambda doc: doc["certificates"]\
.concat_map(lambda x: x["parsed_certificate"]["X509 extensions"])\
    .filter(lambda x: x["basicConstraints"]
.match("^CA:FA"))) \
.run()

How can I also include all of the documents which contain this missing field in my query?

Gerrat · Accepted Answer · 2016-09-10 15:43:07Z

0

It seems that your x doesn't have methods like a regular python dict (I'm not familiar with rethinkdb). You could just use a real function here, with a try/except clause:

def basic_constraints(x):
    try:
        return x["basicConstraints"]
    except:  # find out what the actual exception is and put that here
        return True

q = r.db('scanafi').table(active_table) \
.concat_map(lambda doc: doc["certificates"]\
.concat_map(lambda x: x["parsed_certificate"]["X509 extensions"])\
    .filter(basic_constraints)
.match("^CA:FA"))) \
.run()## Heading ##

edited Sep 10, 2016 at 15:43

answered Sep 10, 2016 at 15:24

Gerrat

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1 Comment

user1513388 Over a year ago

Thanks for the quick response. So I tried that but it throws the following error:

.filter(lambda x: x["basicConstraints"] if "basicConstraints" in x else True TypeError: argument of type 'Var' is not iterable

mlucy · Accepted Answer · 2016-09-13 05:19:51Z

0

You can write x.has_fields('basicConstraints').not().or_(x['basicConstraints'].match("^CA:FA")).

answered Sep 13, 2016 at 5:19

mlucy

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