Add view_activity permission so that users can have the default permission to see activity.

Add view_activity to default permissions when adding a new user.
Add view_activity as a permission group, used when inviting a user.

migrations/versions/0043_view_activity.py

@@ -0,0 +1,37 @@
+"""empty message
+
+Revision ID: 0043_add_view_activity
+Revises: 0042_default_stats_to_zero
+Create Date: 2016-03-29 13:46:36.219549
+
+"""
+
+# revision identifiers, used by Alembic.
+import uuid
+
+revision = '0043_add_view_activity'
+down_revision = '0042_default_stats_to_zero'
+
+from alembic import op
+
+
+def upgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    conn = op.get_bind()
+    conn.execute('COMMIT')
+    conn.execute("alter type permission_types add value IF NOT EXISTS 'view_activity'")
+    user_services = conn.execute("SELECT * FROM user_to_service").fetchall()
+    for user_service in user_services:
+        conn.execute(
+            "insert into permissions (id, service_id, user_id, created_at, permission) "
+            "values('{0}', '{1}', {2}, now(), 'view_activity')".format(
+                uuid.uuid4(), user_service.service_id, user_service.user_id))
+    ### end Alembic commands ###
+
+
+def downgrade():
+    ### commands auto generated by Alembic - please adjust! ###
+    conn = op.get_bind()
+    conn.execute("delete from permissions where permission = 'view_activity'")
+    conn.execute("delete from pg_enum where enumlabel = 'view_activity'")
+    ### end Alembic commands ###