Dica 29 - Django Admin: Criando actions no Admin

# myproject/core/models.py
# ... (veja o arquivo completo no GitHub)

STATUS_CHOICES = (
    ('d', 'Rascunho'),
    ('p', 'Publicado'),
    ('w', 'Retirado'),
)


class Article(models.Model):
    id = HashidAutoField(primary_key=True)
    title = models.CharField('título', max_length=200)
    subtitle = models.CharField('sub-título', max_length=200)
    slug = AutoSlugField(populate_from='title')
    # ... (category e published_date, veja o arquivo completo no GitHub)
    status = models.CharField(max_length=1, choices=STATUS_CHOICES)

    class Meta:
        ordering = ('title',)
        verbose_name = 'artigo'
        verbose_name_plural = 'artigos'

    def __str__(self):
        return self.title

# ... (veja o arquivo completo no GitHub)

python manage.py makemigrations
python manage.py migrate

You are trying to add a non-nullable field 'status' to article without a default; we can't do that (the database needs something to populate existing rows).
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
 2) Quit, and let me add a default in models.py
Select an option: 1
Please enter the default value now, as valid Python
The datetime and django.utils.timezone modules are available, so you can do e.g. timezone.now
Type 'exit' to exit this prompt
>>> 'd'

# myproject/core/migrations/0005_article_status.py
# Generated by Django 2.2.19 on 2021-03-08 01:08

from django.db import migrations, models


class Migration(migrations.Migration):

    dependencies = [
        ('core', '0004_auto_20200614_0901'),
    ]

    operations = [
        migrations.AddField(
            model_name='article',
            name='status',
            field=models.CharField(choices=[('d', 'Rascunho'), ('p', 'Publicado'), ('w', 'Retirado')], default='d', max_length=1),
            preserve_default=False,
        ),
    ]

# myproject/core/admin.py
from django.conf import settings
from django.contrib import admin
from daterange_filter.filter import DateRangeFilter
from .models import Article, Category
# from .forms import ArticleAdminForm


@admin.register(Article)
class ArticleAdmin(admin.ModelAdmin):
    list_display = ('id', 'title', 'slug', 'get_published_date', 'get_category', 'status')
    search_fields = ('title',)
    list_filter = (
        ('published_date', DateRangeFilter),
        'category',
        'status',
    )
    readonly_fields = ('slug',)
    date_hierarchy = 'published_date'
    # form = ArticleAdminForm
    actions = ('make_published',)

    def make_published(self, request, queryset):
        count = queryset.update(status='p')

        if count == 1:
            msg = '{} artigo foi publicado.'
        else:
            msg = '{} artigos foram publicados.'

        self.message_user(request, msg.format(count))

    make_published.short_description = "Publicar artigos"

    def get_published_date(self, obj):
        if obj.published_date:
            return obj.published_date.strftime('%d/%m/%Y')

    get_published_date.short_description = 'Data de Publicação'

    def get_category(self, obj):
        if obj.category:
            return obj.category.title

    get_category.short_description = 'Categoria'


@admin.register(Category)
class CategoryAdmin(admin.ModelAdmin):
    list_display = ('title', 'slug')
    actions = None

    def has_add_permission(self, request, obj=None):
        return False

    if not settings.DEBUG:
        def has_delete_permission(self, request, obj=None):
            return False

python manage.py runserver