How to pass the request object to a form class. Used when form choices are specific to a particular user

forms.py

class CustomModelMultipleChoiceField(forms.ModelMultipleChoiceField):
    def label_from_instance(self, member):
        """ Customises the labels for checkboxes"""
        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
    )