diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9765c3f
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*pyc
+*#
+.#*
diff --git a/documents.py b/documents.py
index 5581011..f0486d3 100644
--- a/documents.py
+++ b/documents.py
@@ -160,12 +160,16 @@ class Job(BackendDocument):
 			#TODO accountId, bundleId, storeCountry, appType{AppStoreApp,CydiaApp}, executionStrategy{DefaultExecution,OpenCloseExecution,RandomExecution,SmartExecution}
 		'worker': Worker,
 		'device': Device,
-		'date_added': float
+		'date_added': float,
+                'error_message': unicode,
+                'compatible_devices': int
 	}
 	required_fields = ['type', 'state', 'jobInfo']
 	default_values = {
 		'date_added': time.time,
-		'state': STATE.UNDEFINED
+		'state': STATE.UNDEFINED,
+                # 100 for ipad, 10 for iPhone and 1 for iPod
+                'compatible_devices': 0b111
 	}
 	indexes = [{
 		'fields':['type', 'state'],
@@ -223,7 +227,24 @@ def can_run_on_device(self, device):
 					if country == acc.storeCountry:
 						return True
 				return False
-		return True
+                if 'minimumOSVersion' in self.jobInfo:
+                        minimumOSVersion = int(self.jobInfo['minimumOSVersion'])
+                        productVersion = int(''.join(device['deviceInfo']['ProductVersion'].split('.')))
+                        if  productVersion < minimumOSVersion:
+                                return False
+
+                deviceClass = device['deviceInfo']['DeviceClass']
+                if deviceClass == 'iPad':
+                        deviceClassValue = 0b100
+                elif deviceClass == 'iPhone':
+                        deviceClassValue = 0b10
+                else:
+                        deviceClassValue = 0b1
+                        
+                if not self.compatible_devices & deviceClassValue:
+                        return False
+                else:
+                        return True
 
 
 # A app is a concrete app (user account, version, bundleID) under test