djadhere/adhesions/admin.py

from django.contrib import admin
from django.contrib.contenttypes.admin import GenericStackedInline
from django.contrib.auth.models import User

from .models import Profile, Corporation, Adherent


class AdherentInline(GenericStackedInline):
    model = Adherent
    ct_field = 'adherent_type'
    ct_fk_field = 'adherent_id'
    extra = 0

    def get_max_num(self, request, obj=None, **kwargs):
        if obj is None or obj.adhesion is None:
            return 1
        else:
            return 0


class ProfileAdmin(admin.ModelAdmin):
    list_display = ('user', 'phone_number',)
    inlines = (AdherentInline,)


class AdherentTypeFilter(admin.SimpleListFilter):
    title = 'type d’adhérent'
    parameter_name = 'type'

    def lookups(self, request, model_admin):
        return (
            ('physique', 'Personne physique'),
            ('morale', 'Personne morale'),
        )

    def queryset(self, request, queryset):
        if self.value() == 'physique':
            return queryset.filter(adherent_type__app_label='auth',
                                   adherent_type__model='user')
        if self.value() == 'morale':
            return queryset.filter(adherent_type__app_label='adhesions',
                                   adherent_type__model='corporation')


class AdherentAdmin(admin.ModelAdmin):
    list_display = ('id', 'adherent_name', 'type',)
    list_filter = (AdherentTypeFilter,)
    fields = ('id', 'contribution',)

    def adherent_name(self, obj):
        return str(obj)
    adherent_name.short_description = 'Nom ou raison sociale'

    def has_add_permission(self, request):
        return False


class CorporationAdmin(admin.ModelAdmin):
    inlines = (AdherentInline,)


admin.site.register(Profile, ProfileAdmin)
admin.site.register(Corporation, CorporationAdmin)
admin.site.register(Adherent, AdherentAdmin)