How to use the user object in Django forms. Used when choices in a multi-select-field are unique to a given user.

forms.py

from django import forms
from .models import Meal
from core.models import Member


class CustomModelMultipleChoiceField(forms.ModelMultipleChoiceField):
    def label_from_instance(self, member):
        return "%s" % member.name


class CreateMealForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        """ Grants access to the request object so that only members of the current user
        are given as options"""

        self.request = kwargs.pop('request')
        super(CreateMealForm, self).__init__(*args, **kwargs)
        self.fields['members'].queryset = Member.objects.filter(
            user=self.request.user)

    class Meta:
        model = Meal
        fields = ['name', 'date', 'members']

    name = forms.CharField()
    date = forms.DateInput()

    members = CustomModelMultipleChoiceField(
        queryset=None,
        widget=forms.CheckboxSelectMultiple
    )

views.py

class AddMeal(CreateView):
    
    model = Meal
    form_class = CreateMealForm
    template_name = 'meals/add_meal.html'
    success_url = reverse_lazy('index')

    def get_form_kwargs(self):
        """ Passes the request object to the form class.
         This is necessary to only display members that belong to a given user"""

        kwargs = super(AddMeal, self).get_form_kwargs()
        kwargs['request'] = self.request
        return kwargs