Created new metadata app and move all code relating metadata to it

apps/metadata/models.py

@@ -0,0 +1,74 @@
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+
+from documents.models import Document
+
+from metadata.conf.settings import AVAILABLE_MODELS
+from metadata.conf.settings import AVAILABLE_FUNCTIONS
+
+available_models_string = (_(u' Available models: %s') % u','.join([name for name, model in AVAILABLE_MODELS.items()])) if AVAILABLE_MODELS else u''
+available_functions_string = (_(u' Available functions: %s') % u','.join([u'%s()' % name for name, function in AVAILABLE_FUNCTIONS.items()])) if AVAILABLE_FUNCTIONS else u''
+
+
+class MetadataType(models.Model):
+    name = models.CharField(unique=True, max_length=48, verbose_name=_(u'name'), help_text=_(u'Do not use python reserved words, or spaces.'))
+    title = models.CharField(max_length=48, verbose_name=_(u'title'), blank=True, null=True)
+    default = models.CharField(max_length=128, blank=True, null=True,
+        verbose_name=_(u'default'),
+        help_text=_(u'Enter a string to be evaluated.%s') % available_functions_string)
+    lookup = models.CharField(max_length=128, blank=True, null=True,
+        verbose_name=_(u'lookup'),
+        help_text=_(u'Enter a string to be evaluated.  Example: [user.get_full_name() for user in User.objects.all()].%s') % available_models_string)
+    #TODO: datatype?
+
+    def __unicode__(self):
+        return self.title if self.title else self.name
+
+    class Meta:
+        verbose_name = _(u'metadata type')
+        verbose_name_plural = _(u'metadata types')
+
+
+class MetadataSet(models.Model):
+    title = models.CharField(max_length=48, verbose_name=_(u'title'))
+
+    def __unicode__(self):
+        return self.title if self.title else self.name
+
+    class Meta:
+        verbose_name = _(u'metadata set')
+        verbose_name_plural = _(u'metadata set')
+
+
+class MetadataSetItem(models.Model):
+    """
+    Define the set of metadata that relates to a set or group of
+    metadata fields
+    """
+    metadata_set = models.ForeignKey(MetadataSet, verbose_name=_(u'metadata set'))
+    metadata_type = models.ForeignKey(MetadataType, verbose_name=_(u'metadata type'))
+    #required = models.BooleanField(default=True, verbose_name=_(u'required'))
+
+    def __unicode__(self):
+        return unicode(self.metadata_type)
+
+    class Meta:
+        verbose_name = _(u'metadata set item')
+        verbose_name_plural = _(u'metadata set items')
+
+
+class DocumentMetadata(models.Model):
+    """
+    Link a document to a specific instance of a metadata type with it's
+    current value
+    """
+    document = models.ForeignKey(Document, verbose_name=_(u'document'))
+    metadata_type = models.ForeignKey(MetadataType, verbose_name=_(u'type'))
+    value = models.TextField(blank=True, null=True, verbose_name=_(u'value'), db_index=True)
+
+    def __unicode__(self):
+        return unicode(self.metadata_type)
+
+    class Meta:
+        verbose_name = _(u'document metadata')
+        verbose_name_plural = _(u'document metadata')