Django Admin (Python meeutp)

Django admin
Python meetup
Ines Jelovac
Zagreb, 14 June 2016

Django Web Framework
● High-level Python Web framework
● MVC
Django admin
● Automatic interface
● For site administrators
● Reads model metadata
● Customizing:
○ Layout
○ Filters
○ Actions

Model example
class Article(models.Model):
author = models.ForeignKey(settings.AUTH_USER_MODEL)
title = models.CharField(max_length=200)
lead_text = models.CharField(max_length=300)
content = models.TextField()
publish_date = models.DateTimeField()
image = models.ImageField()
section = models.ManyToManyField(Section)
def __str__(self):
return self.title

Model metadata
class Article(models.Model):
...
class Meta:
verbose_name = _('Article')
verbose_name_plural = _('Articles')
ordering = ('-publish_date',)

Default admin interface
app/admin.py
from django.contrib import admin
from articles.models import Article
admin.site.register(Article)

Customizing objects list: list_display
● List objects page
○ Default: str() of each object
● list_display option
@admin.register(Article)
class ArticleAdmin(admin.ModelAdmin):
list_display = ['title', 'publish_date']
● list_display_links option

Customizing objects list: list_display

Customizing objects list: empty_value_display
empty_value_display = '(unknown)'

Customizing objects list: empty_value_display

Customizing objects list: list_filter
● Model field
● Foreign key attribute lookup
● Custom querysets
● preserve_filters option
list_filter = ['section', PublishedListFilter]

class PublishedListFilter(admin.SimpleListFilter):
title = 'published'
parameter_name = 'publish_date'
def lookups(self, request, model_admin):
return (
('published', 'published'),
('not_published', 'not published')
)
def queryset(self, request, queryset):
if self.value() == 'published':
return queryset.filter(publish_date__isnull=False)
if self.value() == 'not_published':
return queryset.filter(publish_date__isnull=True)

Customizing objects list: date_hierarchy
date_hierarchy = 'publish_date'

Customizing objects list: date_hierarchy

Customizing objects list: search_fields
● Model field
● Foreign key attribute lookup
● Operators
○ ^ to match starting at the beginning of the field
○ = for case-insensitive exact matching
○ @ operator to perform a full text match
search_fields = ['title']

Customizing objects list: search_fields

Customizing objects list: list_editable
list_display = ['title', 'lead_text','publish_date']
search_fields = ['title']
list_editable = ['lead_text']

Customizing objects list: list_editable

Default edit interface
● Default buttons
○ Delete
○ Save and add another
○ Save and continue editing
○ Save
● save_as option: if set to True “Save as new” replaces “Save and add
another” button

Customizing edit interface: fields
● fields option
○ List of fields in model edit form
○ Change order
○ Group in same line
fields = [
'author',
('title', 'lead_text'),
'content',
('publish_date', 'image'),
'section'
]

Customizing edit interface
● exclude option
○ List of fields not shown in edit form
● readonly_fields option
○ Field or method
● fieldsets option
○ Group fields
● form option
○ Replace default Form with custom
● view_on_site option
○ Boolean - calls get_absolute_url
○ Callable

Customizing edit interface: many to many
● filter_horizontal option
● filter_vertical option
…
filter_horizontal = ['section']

Customizing edit interface: filter_horizontal

Customizing edit interface: inlines
● TabularInline
● StackedInline
class GalleryInline(admin.TabularInline):
model = GalleyImage
extra = 2
...
filter_horizontal = ['section']
inlines = [GalleryInline]

Customizing edit interface: inlines

Customizing admin interface: actions
● Functions that get called with a list of objects selected on the change list page
● Simple logic: use function
● Complex logic: redirect the user to another view in function
def delete_publish_date(modeladmin, request, queryset):
queryset.update(publish_date=None)
delete_publish_date.short_description = "Delete published
date for selected articles"
…
actions = [delete_publish_date]

Customizing edit interface: actions
Customizing admin interface: actions

Optimization
● show_full_result_count option in list view
○ Eliminates expensive count
● list_select_related option in list view
○ Django will use select_related in query
● raw_id_fields option in edit view

There is more
● Overriding default templates
● Overriding methods
● History view
● Decorator @staff_member_required

Django Admin (Python meeutp)

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