Я не думаю, что ManyToMany работает из коробки. Поэтому мне пришлось создать сквозную модель ... и изменить форму администратора на эту ...
models.py
from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.auth.models import User
from django.utils.html import format_html
from django.contrib.contenttypes.models import ContentType
class Category(models.Model):
class Meta:
ordering = ['name']
name = models.CharField(max_length=100)
text = models.TextField(blank=True)
def __str__(self):
return self.name
class Tag(models.Model):
name = models.CharField(max_length=100)
def __str__(self):
return self.name
class Tool(models.Model):
name = models.CharField(max_length=30, null=True, default='')
url = models.URLField(max_length=250, null=True, default='')
image_url = models.URLField(max_length=250, null=True, default='', blank=True)
about = models.TextField(default='', null=True, blank=True)
tags = models.ManyToManyField(
Tag,
through="PageTags",
through_fields=('tool', 'tag'))
category = models.ForeignKey(Category, on_delete=models.CASCADE, blank=True,null=True, related_name="category1")
altcategory = models.ForeignKey(Category, on_delete=models.CASCADE, blank=True,null=True, related_name="category2")
def _get_thumbnail(self):
return format_html(u'<img src="{}" width="150"/>', self.image_url)
_get_thumbnail.allow_tags = True
def _get_link(self):
return format_html(u'<a href="{}" target="_blank"/>{}</a>', self.url, self.url)
_get_link.allow_tags = True
def __str__(self):
return self.name + ": " + self.url
class PageTags(models.Model):
tag = models.ForeignKey(Tag , on_delete=models.CASCADE, )
tool= models.ForeignKey(Tool , on_delete=models.CASCADE, )
amount = models.IntegerField(default=0)
... и admin.py на эту ...
from django.contrib import admin
from django.contrib.admin import TabularInline
#from django.contrib.contenttypes.admin import GenericTabularInline
from django.utils.html import format_html_join
from django.utils.safestring import mark_safe
from .models import Tool, Category, Tag, PageTags
class PageTagsInline(admin.TabularInline):
model = PageTags
extra = 1
class ToolAdmin(admin.ModelAdmin):
#fields = ('name', )
list_display = ('name','_get_link','category','altcategory', "_get_thumbnail", )
list_filter = ('category',)
search_fields = ['name', "about"]
filter_horizontal = ('tags',)
inlines = [PageTagsInline,]
admin.site.register(Tag)
admin.site.register(Category)
admin.site.register(Tool, ToolAdmin)
И интерфейс другой, не похожий на виджеты разрешений, но ОК ... по крайней мере, не бомбить админа.