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--- wiki2:python:django:admin [2018/11/09 10:35]
alfred [Registrar clases]
+++ wiki2:python:django:admin [2020/05/09 09:25] (actual)
@@ Línea 37: / Línea 37: @@
     path('event-admin/', coopolis_admin_site.urls),
 ]
+</code>
+Puedes registrar también ModelAdmins:
+<code>
+class AuthorAdmin(admin.ModelAdmin):
+    pass
+admin.site.register(Author, AuthorAdmin)
+</code>
+O con un decorador:
+<code>
+@admin.register(Book)
+class BookAdmin(admin.ModelAdmin):
+    pass
+</code>
+==== List views ====
+Indicar los **campos** que se verán:
+<code>
+class AuthorAdmin(admin.ModelAdmin):
+    list_display = ('last_name', 'first_name', 'date_of_birth', 'date_of_death')
+</code>
+Los **ManyToMany** no se verán en la lista. Aún así podemos sacar un campo como tal:
+<code>
+    def display_genre(self):
+        """Create a string for the Genre. This is required to display genre in Admin."""
+        return ', '.join(genre.name for genre in self.genre.all()[:3])
+    display_genre.short_description = 'Genre'
+</code>
+Los filtros pueden indicarse también:
+<code>
+class BookInstanceAdmin(admin.ModelAdmin):
+    list_filter = ('status', 'due_back')
+</code>
+:!: **Important**:_ To tell Django we want to perform a join instead of fetching the names of the categories one by one,we can use list_select_related
+<code>
+@admin.register(models.Product)
+class ProductAdmin(admin.ModelAdmin):
+    list_display = (
+        'id',
+        'name',
+        'category',
+    )
+    list_select_related = (
+        'category',
+    )
+</code>
+=== Add a link into the list ===
+<code python>
+from django.contrib import admin
+from django.utils.html import format_html
+class CourseAdmin(admin.ModelAdmin):
+    list_display = ('title', 'my_url_field',)
+    def my_url_field(self, obj):
+        return format_html('<a href="%s%s">%s</a>' % ('http://url-to-prepend.com/', obj.title, obj.title))
+    my_url_field.allow_tags = True
+    my_url_field.short_description = 'Column description'
+</code>
+==== Changing the layout ====
+To put several fields in a row:
+<code>
+class AuthorAdmin(admin.ModelAdmin):
+    list_display = ('last_name', 'first_name', 'date_of_birth', 'date_of_death')
+    fields = ['first_name', 'last_name', ('date_of_birth', 'date_of_death')]
+</code>
+Add fieldsets (sections):
+<code>
+@admin.register(BookInstance)
+class BookInstanceAdmin(admin.ModelAdmin):
+    list_filter = ('status', 'due_back')
+    fieldsets = (
+        (None, {
+            'fields': ('book', 'imprint', 'id')
+        }),
+        ('Availability', {
+            'fields': ('status', 'due_back')
+        }),
+    )
+</code>
+You can do this by declaring inlines, of type TabularInline (horizonal layout) or StackedInline (vertical layout, just like the default model layout).
+<code>
+class BooksInstanceInline(admin.TabularInline):
+    model = BookInstance
+@admin.register(Book)
+class BookAdmin(admin.ModelAdmin):
+    list_display = ('title', 'author', 'display_genre')
+    inlines = [BooksInstanceInline]
+</code>
+===== Admin templates =====
+==== Overriding them ====
+  * https://docs.djangoproject.com/en/2.0/ref/contrib/admin/#admin-overriding-templates
+===== JS y CSS en el Admin =====
+==== Usando jQuery en el Django Admin ====
+<code>
+(function($) {
+    // < start of closure
+    // within this block, $ = django.jQuery
+    $(document).ready(function() {
+      // Your JavaScript
+    });
+})(django.jQuery);
+</code>
+==== Add static snippets ====
+<code>
+# admin.py
+class MyModelAdmin(admin.ModelAdmin):
+    # admin additions
+    class Media:
+        css = {
+            "all": ("css/my_style.css",)
+        }
+        js = ("js/my_script.js",)
 </code>
 ===== Gotchas =====
@@ Línea 63: / Línea 194: @@
 admin.site.unregister(Group)
 </code>
+=== Add new page to the admin ===
+<code python>
+class CourseAdmin(admin.ModelAdmin):
+    list_display = ('title', 'my_url_field',)
+    def get_urls(self):
+        urls = super().get_urls()
+        custom_urls = [
+            path(
+                r'attendee-list/',
+                self.admin_site.admin_view(self.attendee_list),
+                name='attendee-list',
+            ),
+        ]
+        return custom_urls + urls
+    def my_url_field(self, obj):
+        return format_html('<a href="%s" target="_new">Llista d\'assistencia</a>' % reverse('admin:attendee-list'))
+    my_url_field.allow_tags = True
+    my_url_field.short_description = 'Column description'
+    def attendee_list(self, request):
+        import weasyprint
+        import django.template.loader as loader
+        temp = loader.get_template('admin/attendee_list.html')
+        html = temp.render()
+        pdf = weasyprint.HTML(string=html.encode('utf-8'))
+        response = HttpResponse(pdf.write_pdf(), content_type='application/pdf')
+        # response['Content-Disposition'] = 'attachment; filename="llista_assistencia.pdf"'
+        response['Content-Disposition'] = 'filename="llista_assistencia.pdf"'
+        return response
+</code>
+=== Dynamically hide fields ===
+<code>
+class BookAdmin(admin.ModelAdmin):
+    list_display = ("pk", "get_title_or_nothing")
+    def get_form(self, request, obj=None, **kwargs):
+        if obj.type == "1":
+            self.exclude = ("title", )
+        form = super(BookAdmin, self).get_form(request, obj, **kwargs)
+        return form
+</code>

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