Made transaction list nice and beautyful and added a link to it for every account in the account list

cash/admin.py

@@ -1,6 +1,8 @@
 from django.contrib import admin
 from cash.models import *
 from django import forms
+from django.template.defaultfilters import escape
+from django.core.urlresolvers import reverse
 
 class AccountForm(forms.ModelForm):
 	credit_change = forms.DecimalField(max_digits = 5, decimal_places = 2, required = False)
@@ -9,10 +11,15 @@ class AccountForm(forms.ModelForm):
 		model = Account
 
 class AccountAdmin(admin.ModelAdmin):
-	list_display = ('user', 'card_number', 'credit')
+	list_display = ('user', 'card_number', 'credit', 'transaction_link')
 	form = AccountForm
 	readonly_fields = ('credit',)
 
+	def transaction_link(self, account):
+		return '<a href="%s?account__id__exact=%d">Transaktionen</a>' % (reverse("admin:cash_transaction_changelist"), account.id)
+
+	transaction_link.allow_tags = True
+
 	def save_model(self, request, obj, form, change):
 		# TODO: Auslagern
 		PAYOUT_SUBJECT = "Auszahlung"
@@ -41,20 +48,39 @@ class ProductAdmin(admin.ModelAdmin):
 	list_filter = ['category']
 	inlines= [ProductBarcodeInline]
 
-
 class ProductCategoryAdmin(admin.ModelAdmin):
 	list_display = ('name', 'comment')
 
-
 class SalesLogEntryAdmin(admin.ModelAdmin):
 	list_display = ('account', 'timestamp', 'product', 'count', 'unit_price')
 	list_filter = ['account', 'timestamp', 'product']
 
+class TransactionAdmin(admin.ModelAdmin):
+	list_display = ('account', 'timestamp', 'subject', 'description', 'amount')
+	list_filter = ['account', 'timestamp', 'subject']
+	actions = None
+	date_hierarchy = 'timestamp'
+
+	# Disable tampering with the transactions completely
+	def has_add_permission(self, request):
+		return False
+	def has_change_permission(self, request, obj=None):
+		if obj is None:
+			return True
+		return False
+	def has_delete_permission(self, request, obj=None):
+		return False
+
+	# Needed to not trigger an ImproperlyConfigured exception
+	# FIXME: a bit too hacky
+	def changelist_view(self, request, extra_context=None):
+		self.list_display_links = (None, )
+		return super(TransactionAdmin, self).changelist_view(request, extra_context=None)
 
 admin.site.register(Account, AccountAdmin)
 admin.site.register(Product, ProductAdmin)
 admin.site.register(ProductBarcode)
 admin.site.register(ProductCategory, ProductCategoryAdmin)
-admin.site.register(Transaction)
+admin.site.register(Transaction, TransactionAdmin)
 admin.site.register(SalesLogEntry, SalesLogEntryAdmin)