boards/views/settings.py

from django.db import transaction
from django.shortcuts import render, redirect

from boards.abstracts.settingsmanager import get_settings_manager
from boards.views.base import BaseBoardView, CONTEXT_FORM
from boards.forms import SettingsForm, PlainErrorList


class SettingsView(BaseBoardView):

    def get(self, request):
        context = self.get_context_data(request=request)
        settings_manager = get_settings_manager(request)

        selected_theme = settings_manager.get_theme()

        form = SettingsForm(initial={'theme': selected_theme},
                            error_class=PlainErrorList)

        context[CONTEXT_FORM] = form

        return render(request, 'boards/settings.html', context)

    def post(self, request):
        settings_manager = get_settings_manager(request)

        with transaction.atomic():
            form = SettingsForm(request.POST, error_class=PlainErrorList)

            if form.is_valid():
                selected_theme = form.cleaned_data['theme']

                settings_manager.set_theme(selected_theme)

            return redirect('settings')