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from functools import reduce
from data.field.mini_torchtext.example import Example
def example_from_json(obj, fields):
ex = Example()
for key, vals in fields.items():
if vals is not None:
if not isinstance(vals, list):
vals = [vals]
for val in vals:
# for processing the key likes 'foo.bar'
name, field = val
ks = key.split(".")
def reducer(obj, key):
if isinstance(obj, list):
results = []
for data in obj:
if key not in data:
# key error
raise ValueError("Specified key {} was not found in " "the input data".format(key))
else:
results.append(data[key])
return results
else:
# key error
if key not in obj:
raise ValueError("Specified key {} was not found in " "the input data".format(key))
else:
return obj[key]
v = reduce(reducer, ks, obj)
setattr(ex, name, field.preprocess(v))
return ex
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