Add Post.tags property

Retrieves a set of unique tags found in the post.

federation/entities/base.py

@@ -68,6 +68,11 @@ class Post(GUIDMixin, HandleMixin, PublicMixin, CreatedAtMixin, BaseEntity):
         super(Post, self).__init__(*args, **kwargs)
         self._required += ["raw_content"]
 
+    @property
+    def tags(self):
+        """Returns a `set` of unique tags contained in `raw_content`."""
+        return set({word.strip("#") for word in self.raw_content.split() if word.startswith("#")})
+
 
 class Image(GUIDMixin, HandleMixin, PublicMixin, CreatedAtMixin, BaseEntity):
     """Reflects a single image, possibly linked to another object."""

federation/tests/entities/test_base.py

@@ -0,0 +1,8 @@
+from federation.tests.factories.entities import TaggedPostFactory
+
+
+class TestPostEntityTags(object):
+
+    def test_post_entity_returns_list_of_tags(self):
+        post = TaggedPostFactory()
+        assert post.tags == {"tagone", "tagtwo", "tagthree"}

federation/tests/factories/entities.py

@@ -0,0 +1,32 @@
+from random import shuffle
+import factory
+from factory import fuzzy
+
+from federation.entities.base import Post
+
+
+class GUIDMixinFactory(factory.Factory):
+    guid = fuzzy.FuzzyText(length=32)
+
+
+class HandleMixinFactory(factory.Factory):
+    handle = fuzzy.FuzzyText(length=8, suffix="@example.com")
+
+
+class PostFactory(GUIDMixinFactory, HandleMixinFactory, factory.Factory):
+    class Meta:
+        model = Post
+
+    raw_content = fuzzy.FuzzyText(length=300)
+
+
+class TaggedPostFactory(PostFactory):
+
+    @factory.lazy_attribute
+    def raw_content(self):
+        parts = []
+        for tag in ["tagone", "tagtwo", "tagthree", "tagthree"]:  # Yes, three is twice for fun
+            parts.append(fuzzy.FuzzyText(length=50).fuzz())
+            parts.append("#%s" % tag)
+        shuffle(parts)
+        return " ".join(parts)

setup.py

@@ -19,8 +19,9 @@ setup(
         "python-dateutil==2.4.2",
         "python-xrd==0.1",
     ],
-    test_require=[
+    tests_require=[
         "pytest==2.7.2",
+        "factory_boy==2.5.2",
     ],
     include_package_data=True,
 )