some nice mixins for tags, ratings, relations

[zzz-floof.git] / floof / model / tags.py

diff --git a/floof/model/tags.py b/floof/model/tags.py
new file mode 100644 (file)
index 0000000..1a41278
--- /dev/null
+++ b/floof/model/tags.py
@@ -0,0 +1,46 @@
+from elixir import *
+from art import Art
+from floof.lib.dbhelpers import find_or_create, update_or_create
+
+
+class Tag(Entity):
+    # look into how ondelete works.  This just sets a database property.
+    art = ManyToOne('Art', ondelete='cascade')
+    tagger = ManyToOne('User', ondelete='cascade')
+    tagtext = ManyToOne('TagText')
+
+    def __unicode__(self):
+        if not self.tagtext:
+            return "(broken)"
+        return unicode(self.tagtext)
+
+
+class TagText(Entity):
+    text = Field(Unicode(50)) # gotta enforce this somehow
+    tags = OneToMany('Tag')
+
+    def __unicode__(self):
+        return self.text
+
+
+class TagMixin(object):
+    def add_tags(self, tags, user):
+        for text in tags.split():
+            if text[0] == '-':
+                # Nega-tags
+                tagtext = TagText.get_by(text=text[1:])
+                if tagtext:
+                    tag = Tag.get_by(art=self, tagger=user, tagtext=tagtext)
+                    if tag:
+                        elixir.session.delete(tag)
+
+            else:
+                if len(text) > 50:
+                    raise "Long Tag!" # can we handle this more gracefully?
+                # sqlite seems happy to store strings much longer than the supplied limit...
+
+                # elixir should really have its own find_or_create.
+                tagtext = find_or_create(TagText, text=text)
+                tag     = find_or_create(Tag, art=self, tagger=user, tagtext=tagtext)
+                
+Art.__bases__ += (TagMixin, )