dicts.py

#

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

#

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

#

You should have received a copy of the GNU Lesser General Public License along with this program. If not, see http://www.gnu.org/licenses/.

from __future__ import unicode_literals

from itertools import chain

from rows.plugins.utils import create_table

#

Import data from a iterable of dicts

def import_from_dicts(data, samples=None, *args, **kwargs):

#

The algorithm will use the samples first dicts to determine the field names (if samples is None all dicts will be used).

    data = iter(data)

    cached_rows, headers = [], []
    for index, row in enumerate(data, start=1):
        cached_rows.append(row)

        for key in row.keys():
            if key not in headers:
                headers.append(key)

        if samples and index == samples:
            break

    data_rows = (
        [row.get(header, None) for header in headers]
        for row in chain(cached_rows, data)
    )

    kwargs["samples"] = samples
    meta = {"imported_from": "dicts"}
    return create_table(chain([headers], data_rows), meta=meta, *args, **kwargs)

#

Export a rows.Table to a list of dicts

def export_to_dicts(table, *args, **kwargs):

#

    field_names = table.field_names
    return [{key: getattr(row, key) for key in field_names} for row in table]