Spreadsheet calculator + download file with input values

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Hi Fulei,

Thanks for posting, welcome to the community!!

Great that you got started on integrating your Excel sheet in a VIKTOR application.
Just this afternoon I updated the Spreadsheet Calculation Tutorial in our documentation. This implementation also includes the functionality you speak of.

To summarize it in a single snippet:

from pathlib import Path

from viktor import ViktorController
from viktor.external.spreadsheet import SpreadsheetCalculation, SpreadsheetCalculationInput
from viktor.parametrization import ViktorParametrization, NumberField, DownloadButton
from viktor.result import DownloadResult


class Parametrization(ViktorParametrization):
    a = NumberField("Parameter A")
    b = NumberField("Parameter B")
    c = NumberField("Parameter C")
    
    download_button = DownloadButton("Download evaluated spreadsheet", method="download_spreadsheet")


class Controller(ViktorController):
    label = 'My Entity Type'
    parametrization = Parametrization

    def get_evaluated_spreadsheet(self, params):
        inputs = [
            SpreadsheetCalculationInput('A', params.a),
            SpreadsheetCalculationInput('B', params.b),
            SpreadsheetCalculationInput('C', params.c),
        ]
        sheet_path = Path(__file__).parent / 'my_spreadsheet.xlsx'
        sheet = SpreadsheetCalculation.from_path(sheet_path, inputs=inputs)
        result = sheet.evaluate(include_filled_file=True)

        return result

    def download_spreadsheet(self, params, **kwargs):
        result = self.get_evaluated_spreadsheet(params)
        return DownloadResult(result.file_content, 'evaluated_spreadsheet.xlsx')

Let me know if that helps!

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