djadhere/adhesions/admin.py

from django.contrib import admin
from django.contrib.auth.models import User
from django.contrib.contenttypes.admin import GenericStackedInline
from django.db.models import Q
from django.contrib.contenttypes.models import ContentType

from .forms import AdhesionAdminForm
from .models import Adhesion, Corporation
from banking.admin import PaymentInline


class AdhesionInline(GenericStackedInline):
    model = Adhesion
    ct_field = 'adherent_type'
    ct_fk_field = 'adherent_id'
    form = AdhesionAdminForm
    max_num = 1
    extra = 0


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 AdhesionAdmin(admin.ModelAdmin):
    list_display = ('id', 'get_adherent_name', 'type',)
    list_filter = (AdherentTypeFilter,)
    fields = ('id',)
    readonly_fields = ('id',)
    search_fields = ('id',)
    inlines = (PaymentInline,)

    def get_search_results(self, request, queryset, search_term):
        queryset, use_distinct = super().get_search_results(request, queryset, search_term)
        users = User.objects.filter(
                    Q(username__icontains=search_term)
                    | Q(first_name__icontains=search_term)
                    | Q(last_name__icontains=search_term)
        )
        user_type = ContentType.objects.get_for_model(User)
        queryset |= Adhesion.objects.filter(adherent_type=user_type, adherent_id__in=users.values_list('pk'))
        corporations = Corporation.objects.filter(social_reason__icontains=search_term)
        corporation_type = ContentType.objects.get_for_model(Corporation)
        queryset |= Adhesion.objects.filter(adherent_type=corporation_type, adherent_id__in=corporations.values_list('pk'))
        return queryset, use_distinct

    def has_add_permission(self, request):
        return False


class CorporationAdmin(admin.ModelAdmin):
    list_display = ('social_reason', 'adherent_id')
    inlines = (AdhesionInline,)
    search_fields = ('social_reason',)

    def adherent_id(self, corporation):
        adherent = corporation.adhesion
        if adherent:
            return adherent.id
    adherent_id.short_description = 'Numéro d’adhérent'


admin.site.register(Corporation, CorporationAdmin)
admin.site.register(Adhesion, AdhesionAdmin)