added aspect ratio checking for admin (+note)

k4ever/buyable/admin.py

@@ -1,7 +1,36 @@
 from models import Buyable, BuyableType, Purchase, Order
 from django.contrib import admin
+from django import forms
+from PIL import Image
+from django.core.files.uploadedfile import InMemoryUploadedFile
 
-admin.site.register(Buyable)
+class BuyableAdminForm(forms.ModelForm):
+	""" Special BuyableAdminForm which checks the buyable image for an 1:1 aspect ratio. """
+	class Meta:
+		model = Buyable
+	
+	def clean_image(self):
+		img = self.cleaned_data['image']
+		print img.file
+		print dir(img)
+		width, height = (0, 0)
+		if isinstance(img, InMemoryUploadedFile):
+			i = Image.open(img)
+			width, height = i.size
+		else:
+			width, height = img.width, img.height
+
+		if width != height:
+			raise forms.ValidationError("Aspect ratio of image should be 1:1 (width x height was (%dx%d))"% (width, height))
+		return self.cleaned_data['image']
+
+class BuyableAdmin(admin.ModelAdmin):
+	form = BuyableAdminForm
+
+
+
+
+admin.site.register(Buyable, BuyableAdmin)
 admin.site.register(BuyableType)
 admin.site.register(Purchase)
 admin.site.register(Order)

k4ever/buyable/models.py

@@ -17,7 +17,7 @@ class Buyable(models.Model):
 	""" Represents a buyable item. """
 	name = models.CharField(max_length=100)
 	price = models.DecimalField(max_digits=8, decimal_places=2)
-	image = models.ImageField(upload_to='img/buyable/')
+	image = models.ImageField(upload_to='img/buyable/', help_text="<strong>The Image needs to have a 1:1 aspect ratio.</strong>")
 	deposit = models.DecimalField(max_digits=8, decimal_places=2)
 	description = models.TextField()
 	buyableType = models.ManyToManyField(BuyableType)