add 'search posts' button to topic header

lib/philomena/posts/query.ex

@@ -43,9 +43,9 @@ defmodule Philomena.Posts.Query do
 
   int_fields         = ~W(id)
   date_fields        = ~W(created_at updated_at)
-  literal_fields     = ~W(image_id)
+  literal_fields     = ~W(forum_id topic_id)
   ngram_fields       = ~W(body subject)
-  custom_fields      = ~W(author user_id forum_id topic_id)
+  custom_fields      = ~W(author user_id)
   default_field      = "body"
   transforms         = %{
     "user_id" => &Philomena.Posts.Query.user_id_transform/2,

lib/philomena_web/controllers/post_controller.ex

@@ -22,7 +22,6 @@ defmodule PhilomenaWeb.PostController do
                 %{term: %{access_level: "normal"}},
               ],
               must_not: [
-                %{terms: %{image_tag_ids: conn.assigns.current_filter.hidden_tag_ids}},
                 %{term: %{hidden_from_users: true}}
               ]
             }

lib/philomena_web/templates/topic/show.html.slime

@@ -11,9 +11,9 @@ h1 = @topic.title
     => link(@forum.name, to: Routes.forum_path(@conn, :show, @forum))
     ' »
     => link(@topic.title, to: Routes.forum_topic_path(@conn, :show, @forum, @topic))
-    /a href=posts_path(forum_id: @forum.id, subject: @topic.title)
-    /  i.fa.fa-fw.fa-search>
-    /  | Search Posts
+    a href=Routes.post_path(@conn, :index, pq: "topic_id:#{@topic.id}")
+      i.fa.fa-fw.fa-search>
+      ' Search Posts
   .flex.flex--wrap.block__header.block__header--light
     .flex--fixed
       = pagination