post_flags.rb: add 'rejected' and 'deleted' categories.

Includes a category field in /post_flags.json.

Adds 'rejected' and 'deleted' search categories. Categories:

* unapproved - deleted after going unapproved in first three days
* rejected   - deleted after being manually flagged
* deleted    - either of the above
* banned     - artist requested removal
* normal     - none of the above (a "normal" manual flag)

app/models/post_flag.rb

@@ -1,6 +1,12 @@
 class PostFlag < ActiveRecord::Base
   class Error < Exception ; end
 
+  module Reasons
+    UNAPPROVED = "Unapproved in three days"
+    REJECTED = "Unapproved in three days after returning to moderation queue%"
+    BANNED = "Artist requested removal"
+  end
+
   belongs_to :creator, :class_name => "User"
   belongs_to :post
   validates_presence_of :reason, :creator_id, :creator_ip_addr
@@ -66,11 +72,15 @@ class PostFlag < ActiveRecord::Base
 
       case params[:category]
       when "normal"
-        q = q.where("reason not in (?)", ["Unapproved in three days", "Unapproved in three days after returning to moderation queue", "Artist requested removal"])
+        q = q.where("reason NOT IN (?) AND reason NOT LIKE ?", [Reasons::UNAPPROVED, Reasons::BANNED], Reasons::REJECTED)
       when "unapproved"
-        q = q.where("reason in (?)", ["Unapproved in three days", "Unapproved in three days after returning to moderation queue"])
+        q = q.where(reason: Reasons::UNAPPROVED)
       when "banned"
-        q = q.where("reason = ?", "Artist requested removal")
+        q = q.where(reason: Reasons::BANNED)
+      when "rejected"
+        q = q.where("reason LIKE ?", Reasons::REJECTED)
+      when "deleted"
+        q = q.where("reason = ? OR reason LIKE ?", Reasons::UNAPPROVED, Reasons::REJECTED)
       end
 
       q
@@ -85,11 +95,28 @@ class PostFlag < ActiveRecord::Base
       end
       super + list
     end
+
+    def method_attributes
+      super + [:category]
+    end
   end
 
   extend SearchMethods
   include ApiMethods
 
+  def category
+    case reason
+    when Reasons::UNAPPROVED
+      :unapproved
+    when /#{Reasons::REJECTED.gsub("%", ".*")}/
+      :rejected
+    when Reasons::BANNED
+      :banned
+    else
+      :normal
+    end
+  end
+
   def update_post
     post.update_column(:is_flagged, true) unless post.is_flagged?
   end