Allow access to metadata

[som-m]

Summary

• Use dict.get to check whether key is in the dictionary before getting the value of key to prevent KeyError. This should fix Can't access a metadata object #52.

>>> transfer.metadata.recipient_name
Traceback (most recent call last):
  File "/Users/chanapa/Downloads/projects/omise-python/omise/__init__.py", line 147, in __getattr__
    return _as_object(value)
  File "/Users/chanapa/Downloads/projects/omise-python/omise/__init__.py", line 106, in _as_object
    class_ = _get_class_for(data['object'])
KeyError: 'object'

• Add test

QA

You should be able to access metadata.

1. Create a transfer with metadata.

transfer = omise.Transfer.create(
	amount = 100000,
	metadata = dict(
		recipient_id = '0001',
		recipient_name = 'Somchai'
	)
)

2. Access metadata.

>>> transfer.id
'trsf_test_5n6maxqnnscx4046wqn'
>>> transfer.metadata.recipient_name
'Somchai'

[nakarinh14]

@danfowler @rezigned

Hello Omise team, I know it has been a year since the last commit on this repo but can we at least get a minor official release that contains this fix?

The latest release 0.11.0 with pip install omise still got this breaking change, and needs to explicitly install the master branch for the fix.

General developers might not know about this and get confused, and I think it would be nice if the fix is present in the official release.

[amborish-omise]

Hello @nakarinh14 , thanks for the feedback, We are looking at this one and will release a fix soon.

[danfowler]

Hello @nakarinh14, sorry for the delay. We've released 0.12.0 that includes this change.