Make stackbuilder dependencies into a comma separated textfield

The "true dependencies" usign db relationships were too strict for
reality - multiple entries can have the same textid, and that's what
we need to depend on. Resolving it for platform is handled in the
StackBuilder client.

This update requires the following SQL to be run in the database:
DROP TABLE downloads_stackbuilderapp_dependencies;
ALTER TABLE downloads_stackbuilderapp ADD COLUMN txtdependencies varchar(1000) NOT NULL DEFAULT '';
ALTER TABLE downloads_stackbuilderapp ALTER COLUMN txtdependencies DROP DEFAULT;

Closes #167

pgweb/downloads/admin.py

@@ -1,4 +1,9 @@
 from django.contrib import admin
+from django import forms
+from django.forms import ValidationError
+
+import re
+
 from util.admin import PgwebAdmin
 from models import *
 
@@ -25,11 +30,32 @@ def duplicate_stackbuilderapp(modeladmin, request, queryset):
 
 duplicate_stackbuilderapp.short_description = "Duplicate application"
 
+class StackBuilderAppAdminForm(forms.ModelForm):
+	class Meta:
+		model = StackBuilderApp
+
+	def clean_textid(self):
+		if not re.match('^[a-z0-9_]*$', self.cleaned_data['textid']):
+			raise ValidationError('Only lowerchase characters, numbers and underscore allowed!')
+		return self.cleaned_data['textid']
+
+	def clean_txtdependencies(self):
+		if len(self.cleaned_data['txtdependencies']) == 0:
+			return ''
+
+		deplist = self.cleaned_data['txtdependencies'].split(',')
+		if len(deplist) != len(set(deplist)):
+			raise ValidationError('Duplicate dependencies not allowed!')
+
+		for d in deplist:
+			if not StackBuilderApp.objects.filter(textid=d).exists():
+				raise ValidationError("Dependency '%s' does not exist!" % d)
+		return self.cleaned_data['txtdependencies']
+
 class StackBuilderAppAdmin(admin.ModelAdmin):
 	list_display = ('textid', 'active', 'name', 'platform', 'version', )
-	filter_horizontal = ('dependencies', )
 	actions = [duplicate_stackbuilderapp, ]
-
+	form = StackBuilderAppAdminForm
 
 admin.site.register(Mirror, MirrorAdmin)
 admin.site.register(Category)

pgweb/downloads/models.py

@@ -125,7 +125,9 @@ class StackBuilderApp(models.Model):
 	checksum = models.CharField(max_length=32, null=False, blank=False)
 	mirrorpath = models.CharField(max_length=500, null=False, blank=True)
 	alturl = models.URLField(max_length=500, null=False, blank=True)
-	dependencies = models.ManyToManyField("self", blank=True)
+	txtdependencies = models.CharField(max_length=1000, null=False, blank=True,
+									   verbose_name='Dependencies',
+									   help_text='Comma separated list of text dependencies, no spaces!')
 	versionkey = models.CharField(max_length=500, null=False, blank=False)
 
 	def __unicode__(self):

pgweb/downloads/views.py

@@ -272,8 +272,8 @@ def applications_v2_xml(request):
 		x.add_xml_element('mirrorpath', a.mirrorpath)
 		x.add_xml_element('alturl', a.alturl)
 		x.add_xml_element('versionkey', a.versionkey)
-		for dep in a.dependencies.all():
-			x.add_xml_element('dependency', dep.textid)
+		for dep in a.txtdependencies.split(','):
+			x.add_xml_element('dependency', dep)
 		x.endElement('application')
 	x.endElement('applications')
 	x.endDocument()