metadata + post validator + -graph-create-group-feed: end to end create group feed

pkg/arvo/lib/metadata-store.hoon

@@ -67,6 +67,7 @@
       ::
         [%picture s+picture.met]
         [%preview b+preview.met]
+        [%hidden b+hidden.met]
         [%vip s+`@t`vip.met]
     ==
   ::
@@ -177,6 +178,7 @@
         [%config config]
         [%picture so]
         [%preview bo]
+        [%hidden bo]
         [%vip vip]
     ==
   ::

pkg/arvo/mar/graph/validator/post.hoon

@@ -24,7 +24,8 @@
       [atom ~]
     ?:  was-parent-modified
       ~|(%cannot-submit-parents-with-prepopulated-children !!)
-    `^index`(snoc `^index`(snip index) atom)
+    =/  ind=^index  index
+    (snoc (snip ind) atom)
   --
 ++  grab
   |%
@@ -34,6 +35,7 @@
     |=  p=*
     =/  ip  ;;(indexed-post p)
     ?>  ?=(^ contents.p.ip)
+    ip
   --
 ::
 ++  grad  %noun

pkg/arvo/sur/metadata-store.hoon

@@ -44,7 +44,7 @@
       config=md-config
       picture=url
       preview=?
-      hidden=?
+      hidden=_|
       vip=vip-metadata
   ==
 ::

pkg/arvo/ted/graph/create-group-feed.hoon

@@ -23,18 +23,19 @@
   %+  weld  (trip name.group.action)
   %+  weld  "-"
   (trip (scot %ud (mod eny.bowl 10.000)))
-;<  metadatum=(unit metadatum:met)  bind:m
-  %+  scry:strandio  (unit metadatum:met)
+;<  association=(unit association:met)  bind:m
+  %+  scry:strandio  (unit association:met)
   %-  zing
-  :~  /gx/metadata-store/metadata/group
+  :~  /gx/metadata-store/metadata/groups
       (en-path:resource group.action)
       /noun
   ==
-?~  metadatum
+?~  association
   ~|('No group exists, cannot make group feed.' !!)
-?>  ?=(%group -.config.u.metadatum)
-?>  ?|  ?=(~ feed.config.u.metadatum)
-        ?=([~ ~] feed.config.u.metadatum)
+=*  metadatum  metadatum.u.association
+?>  ?=(%group -.config.metadatum)
+?>  ?|  ?=(~ feed.config.metadatum)
+        ?=([~ ~] feed.config.metadatum)
     ==
 ;<  ~  bind:m
   %+  poke-our  %graph-store
@@ -49,8 +50,8 @@
   !>  ^-  action:met
   :^  %add
       group.action
-    group+group.action
-  u.metadatum(feed.config ``[%graph feed-rid])
+    groups+group.action
+  metadatum(feed.config ``[%graph feed-rid])
 ;<  ~  bind:m
   %+  poke-our  %metadata-push-hook
   :-  %metadata-update