flask_crud_app/routes/export_csv.py

from flask import Blueprint, Response
from definitions.models import Asset
import csv
import io

export_csv_bp = Blueprint('export_csv', __name__)

@export_csv_bp.route('/export_csv', methods=['POST'])
def export_csv():
    # Create an in-memory file-like object
    output = io.StringIO()
    writer = csv.writer(output, delimiter='|')

    # Fetch all records from the database
    records = Asset.query.all()

    # Write headers
    writer.writerow([column.name for column in Asset.__mapper__.columns])

    # Write data rows
    for record in records:
        writer.writerow([getattr(record, column.name) for column in Asset.__mapper__.columns])

    # Prepare the response
    response = Response(
        output.getvalue(),
        mimetype="text/csv",
        headers={"Content-Disposition": "attachment;filename=inventory_export.csv"}
    )

    # Close the in-memory file-like object
    output.close()

    return response