Point deserialize from string coordinates

[lafrech]

This change allows Point to deserialize coordinates provided as strings rather than numbers (floats or ints).

I'm serving an API using webargs/flask and I'm using a NestedQueryFlaskParser as suggested in the docs.

I receive a query like this one:

http PUT "http://localhost:5000/buildings/57512e2227b613712d824fe9?name=building&position.x=100&position.y=50"

The custom parser generates a dictionary but does not deserialize the coordinate values into numbers.

I guess marshmallow-mongoengine's Point is the right place to do that. Or am I wrong?

@touilleMan, @kevin0571 any advice?

[coveralls]

Coverage increased (+0.5%) to 94.517% when pulling 107d9a3 on Nobatek:point_deserialize_from_string_coordinates into 23b8f41 on touilleMan:master.

[touilleMan]

Given marshmallow already accept a string as number (https://github.com/marshmallow-code/marshmallow/blob/dev/marshmallow/fields.py#L612), I'm ok with this PR.

Just a single remark: could you add a test with a wrong string (something like data = {'point': { 'x': '10', 'y': '20foo' }})

I wait for this change, then merge&release a new version (unless you want to make other changes before that)

[coveralls]

Coverage increased (+1.04%) to 95.039% when pulling 718ef62 on Nobatek:point_deserialize_from_string_coordinates into 23b8f41 on touilleMan:master.

[lafrech]

Given marshmallow already accept a string as number (https://github.com/marshmallow-code/marshmallow/blob/dev/marshmallow/fields.py#L612), I'm ok with this PR.

Great.

Just a single remark: could you add a test with a wrong string (something like data = {'point': { 'x': '10', 'y': '20foo' }})

Done.

I wait for this change, then merge&release a new version (unless you want to make other changes before that)

Thanks !

(No, no other contrib planned at the moment.)

[lafrech]

This is a corner case, as people would probably send such data as json, I suppose (ultimately, this is what I'm going to do, the query args method explained above was a test).

http PUT http://localhost:5000/buildings/57512e2227b613712d824fe9 name=building position:='{"x":100,"y":50}'

Anyway, casting to float can't do wrong.

[touilleMan]

version 0.7.6 released ;-)