Added possibilty for admin to changer user's credit

cash/admin.py

@@ -1,16 +1,41 @@
 from django.contrib import admin
 from cash.models import *
+from django import forms
 
+class AccountForm(forms.ModelForm):
+	credit_change = forms.DecimalField(max_digits = 5, decimal_places = 2, required = False)
+
+	class Meta:
+		model = Account
 
 class AccountAdmin(admin.ModelAdmin):
 	list_display = ('user', 'card_number', 'credit')
+	form = AccountForm
+	readonly_fields = ('credit',)
+
+	def save_model(self, request, obj, form, change):
+		# TODO: Auslagern
+		PAYOUT_SUBJECT = "Auszahlung"
+		DEPOSIT_SUBJECT = "Einzahlung"
+		DESC = "Autorisiert von %s %s"
+	
+		amount = form.cleaned_data['credit_change']
+
+		print amount
+
+		if amount is not None and amount != 0:
+			if amount > 0:
+				subject = DEPOSIT_SUBJECT
+			else:
+				subject = PAYOUT_SUBJECT
+
+			obj.change_credit(amount, subject, DESC % (request.user.first_name, request.user.last_name))
 
 
 class ProductBarcodeInline(admin.TabularInline):
 	model = ProductBarcode
 	extra = 1
 
-
 class ProductAdmin(admin.ModelAdmin):
 	list_display = ('name', 'category', 'price')
 	list_filter = ['category']