Moved philo files into a philo subdirectory and added a setup.py file. Philo can...

[philo.git] / philo / models / fields / __init__.py

diff --git a/philo/models/fields/__init__.py b/philo/models/fields/__init__.py
new file mode 100644 (file)
index 0000000..1f9603e
--- /dev/null
+++ b/philo/models/fields/__init__.py
@@ -0,0 +1,135 @@
+from django import forms
+from django.core.exceptions import ValidationError
+from django.core.validators import validate_slug
+from django.db import models
+from django.utils import simplejson as json
+from django.utils.text import capfirst
+from django.utils.translation import ugettext_lazy as _
+from philo.forms.fields import JSONFormField
+from philo.validators import TemplateValidator, json_validator
+#from philo.models.fields.entities import *
+
+
+class TemplateField(models.TextField):
+       def __init__(self, allow=None, disallow=None, secure=True, *args, **kwargs):
+               super(TemplateField, self).__init__(*args, **kwargs)
+               self.validators.append(TemplateValidator(allow, disallow, secure))
+
+
+class JSONDescriptor(object):
+       def __init__(self, field):
+               self.field = field
+       
+       def __get__(self, instance, owner):
+               if instance is None:
+                       raise AttributeError # ?
+               
+               if self.field.name not in instance.__dict__:
+                       json_string = getattr(instance, self.field.attname)
+                       instance.__dict__[self.field.name] = json.loads(json_string)
+               
+               return instance.__dict__[self.field.name]
+       
+       def __set__(self, instance, value):
+               instance.__dict__[self.field.name] = value
+               setattr(instance, self.field.attname, json.dumps(value))
+       
+       def __delete__(self, instance):
+               del(instance.__dict__[self.field.name])
+               setattr(instance, self.field.attname, json.dumps(None))
+
+
+class JSONField(models.TextField):
+       default_validators = [json_validator]
+       
+       def get_attname(self):
+               return "%s_json" % self.name
+       
+       def contribute_to_class(self, cls, name):
+               super(JSONField, self).contribute_to_class(cls, name)
+               setattr(cls, name, JSONDescriptor(self))
+               models.signals.pre_init.connect(self.fix_init_kwarg, sender=cls)
+       
+       def fix_init_kwarg(self, sender, args, kwargs, **signal_kwargs):
+               # Anything passed in as self.name is assumed to come from a serializer and
+               # will be treated as a json string.
+               if self.name in kwargs:
+                       value = kwargs.pop(self.name)
+                       
+                       # Hack to handle the xml serializer's handling of "null"
+                       if value is None:
+                               value = 'null'
+                       
+                       kwargs[self.attname] = value
+       
+       def formfield(self, *args, **kwargs):
+               kwargs["form_class"] = JSONFormField
+               return super(JSONField, self).formfield(*args, **kwargs)
+
+
+class SlugMultipleChoiceField(models.Field):
+       __metaclass__ = models.SubfieldBase
+       description = _("Comma-separated slug field")
+       
+       def get_internal_type(self):
+               return "TextField"
+       
+       def to_python(self, value):
+               if not value:
+                       return []
+               
+               if isinstance(value, list):
+                       return value
+               
+               return value.split(',')
+       
+       def get_prep_value(self, value):
+               return ','.join(value)
+       
+       def formfield(self, **kwargs):
+               # This is necessary because django hard-codes TypedChoiceField for things with choices.
+               defaults = {
+                       'widget': forms.CheckboxSelectMultiple,
+                       'choices': self.get_choices(include_blank=False),
+                       'label': capfirst(self.verbose_name),
+                       'required': not self.blank,
+                       'help_text': self.help_text
+               }
+               if self.has_default():
+                       if callable(self.default):
+                               defaults['initial'] = self.default
+                               defaults['show_hidden_initial'] = True
+                       else:
+                               defaults['initial'] = self.get_default()
+               
+               for k in kwargs.keys():
+                       if k not in ('coerce', 'empty_value', 'choices', 'required',
+                                                'widget', 'label', 'initial', 'help_text',
+                                                'error_messages', 'show_hidden_initial'):
+                               del kwargs[k]
+               
+               defaults.update(kwargs)
+               form_class = forms.TypedMultipleChoiceField
+               return form_class(**defaults)
+       
+       def validate(self, value, model_instance):
+               invalid_values = []
+               for val in value:
+                       try:
+                               validate_slug(val)
+                       except ValidationError:
+                               invalid_values.append(val)
+               
+               if invalid_values:
+                       # should really make a custom message.
+                       raise ValidationError(self.error_messages['invalid_choice'] % invalid_values)
+
+
+try:
+       from south.modelsinspector import add_introspection_rules
+except ImportError:
+       pass
+else:
+       add_introspection_rules([], ["^philo\.models\.fields\.SlugMultipleChoiceField"])
+       add_introspection_rules([], ["^philo\.models\.fields\.TemplateField"])
+       add_introspection_rules([], ["^philo\.models\.fields\.JSONField"])
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