simplifies parent/child preview code; fixes #1489

app/controllers/posts_controller.rb

@@ -22,13 +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::PostRelationship.new(@post.parent_id, :include_deleted => @post.is_deleted?)
-    @children_post_set = PostSets::Post.new("parent:#{@post.id} -id:#{@post.id}", 1, 200)
+    @children_post_set = PostSets::PostRelationship.new(@post.id, :include_deleted => @post.is_deleted?)
-    @children_post_set.posts.reverse!
-    @parent_post_set = PostSets::Post.new("id:#{@post.parent_id} status:any")
-    @siblings_post_set = PostSets::Post.new("parent:#{@post.parent_id} -id:#{@post.parent_id}", 1, 200)
-    @siblings_post_set.posts.reverse!
-
     respond_with(@post)
   end
 

app/helpers/posts_helper.rb

@@ -41,16 +41,17 @@ module PostsHelper
     end
   end
 
-  def has_parent_message(post, parent_post_set, siblings_post_set)
+  def has_parent_message(post, parent_post_set)
     html = ""
 
     html << "This post belongs to a "
     html << link_to("parent", post_path(post.parent_id))
-    html << " (deleted)" if parent_post_set.posts.first.is_deleted?
+    html << " (deleted)" if parent_post_set.parent.first.is_deleted?
 
-    if siblings_post_set.posts.count > 1
+    sibling_count = parent_post_set.children.count - 1
+    if sibling_count > 0
       html << " and has "
-      text = siblings_post_set.posts.count > 2 ? "#{siblings_post_set.posts.count - 1} siblings" : "a sibling"
+      text = sibling_count == 1 ? "a sibling" : "#{sibling_count} siblings"
       html << link_to(text, posts_path(:tags => "parent:#{post.parent_id}"))
     end
 
@@ -65,7 +66,7 @@ module PostsHelper
     html = ""
 
     html << "This post has "
-    text = children_post_set.posts.count == 1 ? "a child" : "#{children_post_set.posts.count} children"
+    text = children_post_set.children.count == 1 ? "a child" : "#{children_post_set.children.count} children"
     html << link_to(text, posts_path(:tags => "parent:#{post.id}"))
 
     html << " (#{link_to("learn more", wiki_pages_path(:title => "help:post_relationships"))}) "

app/logical/post_sets/post_relationship.rb

@@ -0,0 +1,24 @@
+module PostSets
+  class PostRelationship < PostSets::Post
+    attr_reader :parent, :children
+
+    def initialize(parent_id, options = {})
+      @parent = ::Post.where("id = ?", parent_id)
+      @children = ::Post.where("parent_id = ?", parent_id).order("id ASC")
+      if options[:include_deleted]
+        super("parent:#{parent_id} status:any")
+      else
+        @children = @children.where("is_deleted = ?", false)
+        super("parent:#{parent_id}")
+      end
+    end
+
+    def posts
+      @parent + @children
+    end
+
+    def presenter
+      ::PostSetPresenters::Post.new(self)
+    end
+  end
+end

app/views/posts/partials/show/_notices.html.erb

@@ -48,8 +48,8 @@
 
 <% if post.parent_id %>
   <div class="ui-corner-all ui-state-highlight notice notice-child">
-    <%= has_parent_message(post, @parent_post_set, @siblings_post_set) %>
+    <%= has_parent_message(post, @parent_post_set) %>
-    <div id="has-parent-relationship-preview"><%= @parent_post_set.presenter.post_previews_html(self) %><%= @siblings_post_set.presenter.post_previews_html(self) %></div>
+    <div id="has-parent-relationship-preview"><%= @parent_post_set.presenter.post_previews_html(self) %></div>
   </div>
 <% end %>