fixes #1450

Additionally:
* Adds basic negated id metatag.
* Post set presenter now uses the post set's tag string, not the
parameter from the URL.

app/controllers/posts_controller.rb

@@ -22,8 +22,8 @@ class PostsController < ApplicationController
     @post = Post.find(params[:id])
     @post_flag = PostFlag.new(:post_id => @post.id)
     @post_appeal = PostAppeal.new(:post_id => @post.id)
-    @parent_post_set = PostSets::Post.new("parent:#{@post.id}")
-    @child_post_set = PostSets::Post.new("parent:#{@post.parent_id}")
+    @parent_post_set = PostSets::Post.new("parent:#{@post.id} -id:#{@post.id}")
+    @child_post_set = PostSets::Post.new("id:#{@post.parent_id} status:any")
     respond_with(@post)
   end
 

app/logical/post_query_builder.rb

@@ -207,6 +207,10 @@ class PostQueryBuilder
       has_constraints!
     end
 
+    if q[:post_id_negated]
+      relation = relation.where("posts.id <> ?", q[:post_id_negated])
+    end
+
     if q[:parent] == "none"
       relation = relation.where("posts.parent_id IS NULL")
     elsif q[:parent_neg] == "none" || q[:parent] == "any"

app/models/tag.rb

@@ -1,5 +1,5 @@
 class Tag < ActiveRecord::Base
-  METATAGS = "-user|user|-approver|approver|commenter|comm|noter|-pool|pool|-fav|fav|sub|md5|-rating|rating|-locked|locked|width|height|mpixels|score|favcount|filesize|source|id|date|age|order|-status|status|tagcount|gentags|arttags|chartags|copytags|parent|-parent|pixiv_id|pixiv"
+  METATAGS = "-user|user|-approver|approver|commenter|comm|noter|-pool|pool|-fav|fav|sub|md5|-rating|rating|-locked|locked|width|height|mpixels|score|favcount|filesize|source|id|-id|date|age|order|-status|status|tagcount|gentags|arttags|chartags|copytags|parent|-parent|pixiv_id|pixiv"
   attr_accessible :category
   has_one :wiki_page, :foreign_key => "name", :primary_key => "title"
 
@@ -378,6 +378,9 @@ class Tag < ActiveRecord::Base
           when "id"
             q[:post_id] = parse_helper($2)
 
+          when "-id"
+            q[:post_id_negated] = $2.to_i
+
           when "width"
             q[:width] = parse_helper($2)
 

app/presenters/post_set_presenters/base.rb

@@ -12,7 +12,7 @@ module PostSetPresenters
       end
 
       posts.each do |post|
-        html << PostPresenter.preview(post, :tags => template.params[:tags])
+        html << PostPresenter.preview(post, :tags => @post_set.tag_string)
       end
 
       html.html_safe