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Filter nested properties based on metadata #94

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Filter nested properties based on metadata #94

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160f6b9
Support filtering of nested fields
chrisgoddard Feb 21, 2019
c76e52f
Update transform.py
chrisgoddard Feb 21, 2019
68a8a82
Update transform.py
chrisgoddard Feb 21, 2019
3547c58
Update transform.py
chrisgoddard Feb 21, 2019
9b7dd78
Update transform.py
chrisgoddard Feb 21, 2019
acbe484
Update transform.py
chrisgoddard Feb 21, 2019
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30 changes: 22 additions & 8 deletions singer/transform.py
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,16 @@ def unix_seconds_to_datetime(value):
return strftime(datetime.datetime.fromtimestamp(int(value), datetime.timezone.utc))


def breadcrumb_path(breadcrumb):
"""
Transform breadcrumb into familiar object dot-notation
"""
name = ".".join(breadcrumb)
name = name.replace('properties.', '')
name = name.replace('.items', '[]')
return name


class SchemaMismatch(Exception):
def __init__(self, errors):
if not errors:
Expand Down Expand Up @@ -101,21 +111,25 @@ def __enter__(self):
def __exit__(self, *args):
self.log_warning()

def filter_data_by_metadata(self, data, metadata):
def filter_data_by_metadata(self, data, metadata, parent=()):
if isinstance(data, dict) and metadata:
for field_name in list(data.keys()):
selected = singer.metadata.get(metadata, ('properties', field_name), 'selected')
inclusion = singer.metadata.get(metadata, ('properties', field_name), 'inclusion')
breadcrumb = parent + ('properties', field_name)
selected = singer.metadata.get(metadata, breadcrumb, 'selected')
inclusion = singer.metadata.get(metadata, breadcrumb, 'inclusion')
if inclusion == 'automatic':
continue

if selected is False:
if (selected is False) or (inclusion == 'unsupported'):
data.pop(field_name, None)
self.filtered.add(field_name)
self.filtered.add(breadcrumb_path(breadcrumb))
else:
data[field_name] = self.filter_data_by_metadata(
data[field_name], metadata, breadcrumb)

if inclusion == 'unsupported':
data.pop(field_name, None)
self.filtered.add(field_name)
if isinstance(data, list) and metadata:
breadcrumb = parent + ('items',)
data = [self.filter_data_by_metadata(d, metadata, parent + ('items', )) for d in data]

return data

Expand Down