Implemented EntityForm, which knows how to deal with AttributeFields and Relationship...

[philo.git] / models / fields.py

diff --git a/models/fields.py b/models/fields.py
index 467befb..9fc2dfb 100644 (file)
--- a/models/fields.py
+++ b/models/fields.py
@@ -1,12 +1,39 @@
 from django.db import models
-from django.db.models import signals
+from django import forms
 from django.core.exceptions import FieldError
 from philo.models.base import Entity
+from philo.signals import entity_class_prepared
 
 
 __all__ = ('AttributeField', 'RelationshipField')
 
 
+class EntityProxyField(object):
+       descriptor_class = None
+       
+       def __init__(self, *args, **kwargs):
+               if self.descriptor_class is None:
+                       raise NotImplementedError('EntityProxyField subclasses must specify a descriptor_class.')
+       
+       def actually_contribute_to_class(self, sender, **kwargs):
+               sender._entity_meta.add_proxy_field(self)
+               setattr(sender, self.attname, self.descriptor_class(self))
+       
+       def contribute_to_class(self, cls, name):
+               if issubclass(cls, Entity):
+                       self.name = name
+                       self.attname = name
+                       entity_class_prepared.connect(self.actually_contribute_to_class, sender=cls)
+               else:
+                       raise FieldError('%s instances can only be declared on Entity subclasses.' % self.__class__.__name__)
+       
+       def formfield(self, *args, **kwargs):
+               raise NotImplementedError('EntityProxyField subclasses must implement a formfield method.')
+       
+       def value_from_object(self, obj):
+               return getattr(obj, self.attname)
+
+
 class AttributeFieldDescriptor(object):
        def __init__(self, field):
                self.field = field
@@ -35,19 +62,19 @@ class AttributeFieldDescriptor(object):
                instance._removed_attribute_registry.append(self.field.key)
 
 
-class AttributeField(object):
-       def __init__(self, key):
-               self.key = key
+class AttributeField(EntityProxyField):
+       descriptor_class = AttributeFieldDescriptor
        
-       def actually_contribute_to_class(self, sender, **kwargs):
-               setattr(sender, self.name, AttributeFieldDescriptor(self))
+       def __init__(self, key, field_template=None):
+               self.key = key
+               if field_template is None:
+                       field_template = models.CharField(max_length=255)
+               self.field_template = field_template
        
-       def contribute_to_class(self, cls, name):
-               if issubclass(cls, Entity):
-                       self.name = name
-                       signals.class_prepared.connect(self.actually_contribute_to_class, sender=cls)
-               else:
-                       raise FieldError('AttributeFields can only be declared on Entity subclasses.')
+       def formfield(self, *args, **kwargs):
+               field = self.field_template.formfield(*args, **kwargs)
+               field.required = False
+               return field
 
 
 class RelationshipFieldDescriptor(object):
@@ -81,16 +108,21 @@ class RelationshipFieldDescriptor(object):
                instance._removed_relationship_registry.append(self.field.key)
 
 
-class RelationshipField(object):
-       def __init__(self, key):
+class RelationshipField(EntityProxyField):
+       descriptor_class = RelationshipFieldDescriptor
+       
+       def __init__(self, key, model, limit_choices_to=None):
                self.key = key
+               self.model = model
+               if limit_choices_to is None:
+                       limit_choices_to = {}
+               self.limit_choices_to = limit_choices_to
        
-       def actually_contribute_to_class(self, sender, **kwargs):
-               setattr(sender, self.name, RelationshipFieldDescriptor(self))
+       def formfield(self, form_class=forms.ModelChoiceField, **kwargs):
+               field = form_class(self.model._default_manager.complex_filter(self.limit_choices_to), **kwargs)
+               field.required = False
+               return field
        
-       def contribute_to_class(self, cls, name):
-               if issubclass(cls, Entity):
-                       self.name = name
-                       signals.class_prepared.connect(self.actually_contribute_to_class, sender=cls)
-               else:
-                       raise FieldError('RelationshipFields can only be declared on Entity subclasses.')
\ No newline at end of file
+       def value_from_object(self, obj):
+               relobj = super(RelationshipField, self).value_from_object(obj)
+               return getattr(relobj, 'pk', None)
\ No newline at end of file