Added JSON validator to Attributes.

[philo.git] / models / base.py

diff --git a/models/base.py b/models/base.py
index 37710b8..33c994c 100644 (file)
--- a/models/base.py
+++ b/models/base.py
@@ -3,7 +3,10 @@ from django.contrib.contenttypes.models import ContentType
 from django.contrib.contenttypes import generic
 from django.utils import simplejson as json
 from django.core.exceptions import ObjectDoesNotExist
+from philo.exceptions import AncestorDoesNotExist
 from philo.utils import ContentTypeRegistryLimiter
+from philo.signals import entity_class_prepared
+from philo.validators import json_validator
 from UserDict import DictMixin
 
 
@@ -34,7 +37,7 @@ class Attribute(models.Model):
        entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID')
        entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id')
        key = models.CharField(max_length=255)
-       json_value = models.TextField(verbose_name='Value (JSON)', help_text='This value must be valid JSON.')
+       json_value = models.TextField(verbose_name='Value (JSON)', help_text='This value must be valid JSON.', validators=[json_validator])
        
        def get_value(self):
                return json.loads(self.json_value)
@@ -52,6 +55,7 @@ class Attribute(models.Model):
        
        class Meta:
                app_label = 'philo'
+               unique_together = ('key', 'entity_content_type', 'entity_object_id')
 
 
 value_content_type_limiter = ContentTypeRegistryLimiter()
@@ -71,8 +75,8 @@ class Relationship(models.Model):
        entity_object_id = models.PositiveIntegerField(verbose_name='Entity ID')
        entity = generic.GenericForeignKey('entity_content_type', 'entity_object_id')
        key = models.CharField(max_length=255)
-       value_content_type = models.ForeignKey(ContentType, related_name='relationship_value_set', limit_choices_to=value_content_type_limiter, verbose_name='Value type')
-       value_object_id = models.PositiveIntegerField(verbose_name='Value ID')
+       value_content_type = models.ForeignKey(ContentType, related_name='relationship_value_set', limit_choices_to=value_content_type_limiter, verbose_name='Value type', null=True, blank=True)
+       value_object_id = models.PositiveIntegerField(verbose_name='Value ID', null=True, blank=True)
        value = generic.GenericForeignKey('value_content_type', 'value_object_id')
        
        def __unicode__(self):
@@ -80,6 +84,7 @@ class Relationship(models.Model):
        
        class Meta:
                app_label = 'philo'
+               unique_together = ('key', 'entity_content_type', 'entity_object_id')
 
 
 class QuerySetMapper(object, DictMixin):
@@ -102,7 +107,30 @@ class QuerySetMapper(object, DictMixin):
                return list(keys)
 
 
+class EntityOptions(object):
+       def __init__(self, options):
+               if options is not None:
+                       for key, value in options.__dict__.items():
+                               setattr(self, key, value)
+               if not hasattr(self, 'proxy_fields'):
+                       self.proxy_fields = []
+       
+       def add_proxy_field(self, proxy_field):
+               self.proxy_fields.append(proxy_field)
+
+
+class EntityBase(models.base.ModelBase):
+       def __new__(cls, name, bases, attrs):
+               new = super(EntityBase, cls).__new__(cls, name, bases, attrs)
+               entity_options = attrs.pop('EntityMeta', None)
+               setattr(new, '_entity_meta', EntityOptions(entity_options))
+               entity_class_prepared.send(sender=new)
+               return new
+
+
 class Entity(models.Model):
+       __metaclass__ = EntityBase
+       
        attribute_set = generic.GenericRelation(Attribute, content_type_field='entity_content_type', object_id_field='entity_object_id')
        relationship_set = generic.GenericRelation(Relationship, content_type_field='entity_content_type', object_id_field='entity_object_id')
        
@@ -214,7 +242,7 @@ class TreeManager(models.Manager):
 class TreeModel(models.Model):
        objects = TreeManager()
        parent = models.ForeignKey('self', related_name='children', null=True, blank=True)
-       slug = models.SlugField()
+       slug = models.SlugField(max_length=255)
        
        def has_ancestor(self, ancestor):
                parent = self
@@ -225,7 +253,9 @@ class TreeModel(models.Model):
                return False
        
        def get_path(self, root=None, pathsep='/', field='slug'):
-               if root is not None and self.has_ancestor(root):
+               if root is not None:
+                       if not self.has_ancestor(root):
+                               raise AncestorDoesNotExist(root)
                        path = ''
                        parent = self
                        while parent and parent != root:
@@ -249,7 +279,7 @@ class TreeModel(models.Model):
                abstract = True
 
 
-class TreeEntity(TreeModel, Entity):
+class TreeEntity(Entity, TreeModel):
        @property
        def attributes(self):
                if self.parent: