drf-renderer-xlsx 0.3.1

Django REST Framework renderer for spreadsheet (xlsx) files.

Django REST Framework Renderer: XLSX

drf-renderer-xlsx provides an XLSX renderer for Django REST Framework. It uses OpenPyXL to create the spreadsheet and returns the data.

Requirements

It may work with earlier versions, but has been tested with the following:

• Python >= 3.5 (Python 2 will not work with Unicode)
• Django >= 1.11
• Django REST Framework >= 3.6
• OpenPyXL >= 2.4

Installation

pip install drf-renderer-xlsx

Then add the following to your REST_FRAMEWORK settings:

    REST_FRAMEWORK = {
        ...

        'DEFAULT_RENDERER_CLASSES': (
            'rest_framework.renderers.JSONRenderer',
            'rest_framework.renderers.BrowsableAPIRenderer',
            'drf_renderer_xlsx.renderers.XLSXRenderer',
        ),
    }

To avoid having a file streamed without a filename (which the browser will often default to the filename "download", with no extension), we need to use a mixin to override the Content-Disposition header. If no filename is provided, it will default to export.xlsx. For example:

from rest_framework.viewsets import ReadOnlyModelViewSet
from drf_renderer_xlsx.mixins import XLSXFileMixin
from drf_renderer_xlsx.renderers import XLSXRenderer

from .models import MyExampleModel
from .serializers import MyExampleSerializer

class MyExampleViewSet(XLSXFileMixin, ReadOnlyModelViewSet):
    queryset = MyExampleModel.objects.all()
    serializer_class = MyExampleSerializer
    renderer_classes = (XLSXRenderer,)
    filename = 'my_export.xlsx'

Configuring Styles

Styles can be added to your worksheet header, column header row, and body rows, from view attributes header, column_header, body. Any arguments from the openpyxl library can be used for font, alignment, fill and border_side (border will always be all side of cell).

class MyExampleViewSet(XLSXFileMixin, ReadOnlyModelViewSet):
    queryset = MyExampleModel.objects.all()
    serializer_class = MyExampleSerializer
    renderer_classes = (XLSXRenderer,)

    column_header = {
        'titles': [
            "Column_1_name",
            "Column_2_name",
            "Column_3_name",
        ],
        'column_width': [17, 30, 17],
        'height': 25,
        'style': {
            'fill': {
                'fill_type': 'solid',
                'start_color': 'FFCCFFCC',
            },
            'alignment': {
                'horizontal': 'center',
                'vertical': 'center',
                'wrapText': True,
                'shrink_to_fit': True,
            },
            'border_side': {
                'border_style': 'thin',
                'color': 'FF000000',
            },
            'font': {
                'name': 'Arial',
                'size': 14,
                'bold': True,
                'color': 'FF000000',
            },
        },
    }
    body = {
        'style': {
            'fill': {
                'fill_type': 'solid',
                'start_color': 'FFCCFFCC',
            },
            'alignment': {
                'horizontal': 'center',
                'vertical': 'center',
                'wrapText': True,
                'shrink_to_fit': True,
            },
            'border_side': {
                'border_style': 'thin',
                'color': 'FF000000',
            },
            'font': {
                'name': 'Arial',
                'size': 14,
                'bold': False,
                'color': 'FF000000',
            }
        },
        'height': 40,
    }

Also you can dynamically generate style attributes in methods get_body, get_header, get_column_header.

def get_header(self):
    starttime, endtime = parse_times(request=self.request)
    datetime_format = "%H:%M:%S %d.%m.%Y"
    return {
        'tab_title': 'MyReport',
        'header_title': 'Report from {} to {}'.format(
            starttime.strftime(datetime_format),
            endtime.strftime(datetime_format),
        ),
        'height': 45,
        'img': 'app/images/MyLogo.png',
        'style': {
            'fill': {
                'fill_type': 'solid',
                'start_color': 'FFFFFFFF',
            },
            'alignment': {
                'horizontal': 'center',
                'vertical': 'center',
                'wrapText': True,
                'shrink_to_fit': True,
            },
            'border_side': {
                'border_style': 'thin',
                'color': 'FF000000',
            },
            'font': {
                'name': 'Arial',
                'size': 16,
                'bold': True,
                'color': 'FF000000',
            }
        }
    }

Also you can add color field to your serializer and fill body rows.

class ExampleSerializer(serializers.Serializer):
    color = serializers.SerializerMethodField()

    def get_color(self, instance):
        color_map = {'w': 'FFFFFFCC', 'a': 'FFFFCCCC'}
        return color_map.get(instance.alarm_level, 'FFFFFFFF')

Release Notes

0.3.1

• Fix an error when an empty result set was returned from the endpoint. Now, it will properly just download an empty spreadsheet.
• Remove an errant format() function which was removing typing from the spreadsheet.

0.3.0

• Add support for custom spreadsheet styles (thanks, Pavel Bryantsev!)
• Add an attribute for setting the download filename instead of export.xlsx per view.

Maintainer

• Timothy Allen at The Wharton School

Contributors (Thank You!)

• Pavel Tolstolytko
• Pavel Bryantsev