76 lines
2.0 KiB
Python
76 lines
2.0 KiB
Python
"""
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pyexcel_io.database.querysets
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The lower level handler for querysets
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:copyright: (c) 2014-2022 by Onni Software Ltd.
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:license: New BSD License, see LICENSE for more details
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"""
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import datetime
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from itertools import chain
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from pyexcel_io.constants import DEFAULT_SHEET_NAME
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from pyexcel_io.plugin_api.abstract_sheet import ISheet
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class QuerysetsReader(ISheet):
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"""turn querysets into an array"""
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def __init__(self, query_sets, column_names):
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self.name = DEFAULT_SHEET_NAME
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self.__column_names = column_names
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self.__query_sets = query_sets
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def row_iterator(self):
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return chain([self.__column_names], self.__query_sets)
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def to_array(self):
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"""
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Convert query sets into an array
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"""
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if len(self.__query_sets) == 0:
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yield []
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for row in self.row_iterator():
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row_values = []
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for value in self.column_iterator(row):
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row_values.append(value)
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yield row_values
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def column_iterator(self, row):
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if self.__column_names is None:
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return
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if isinstance(row, list):
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for element in row:
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yield element
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else:
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for column in self.__column_names:
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if "__" in column:
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value = get_complex_attribute(row, column)
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else:
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value = get_simple_attribute(row, column)
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yield value
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def get_complex_attribute(row, attribute):
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"""recursively get an attribute"""
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attributes = attribute.split("__")
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value = row
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try:
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for attributee in attributes:
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value = get_simple_attribute(value, attributee)
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except AttributeError:
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value = None
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return value
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def get_simple_attribute(row, attribute):
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"""get dotted attribute"""
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value = getattr(row, attribute)
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if isinstance(value, (datetime.date, datetime.time)):
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value = value.isoformat()
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return value
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