refactored search

app/models/forum_post.rb

@@ -10,9 +10,53 @@ class ForumPost < ActiveRecord::Base
   validates_presence_of :body, :creator_id
   validate :validate_topic_is_unlocked
   before_destroy :validate_topic_is_unlocked
-  scope :body_matches, lambda {|body| where(["forum_posts.text_index @@ plainto_tsquery(?)", body])}
-  scope :for_user, lambda {|user_id| where("forum_posts.creator_id = ?", user_id)}
-  scope :active, where("is_deleted = false")
+  
+  module SearchMethods
+    def body_matches(body)
+      where("forum_posts.text_index @@ plainto_tsquery(?)", body)
+    end
+    
+    def for_user(user_id)
+      where("forum_posts.creator_id = ?", user_id)
+    end
+    
+    def creator_name(name)
+      where("forum_posts.creator_id = (select _.id from users _ where lower(_.name) = ?)", name)
+    end
+    
+    def active
+      where("is_deleted = false")
+    end
+    
+    def search(params)
+      q = scoped
+      return q if params.blank?
+      
+      if params[:creator_id]
+        q = q.where("creator_id = ?", params[:creator_id].to_i)
+      end
+      
+      if params[:topic_id]
+        q = q.where("topic_id = ?", params[:topic_id].to_i)
+      end
+      
+      if params[:topic_title_matches]
+        q = q.joins(:topic).where("forum_topics.text_index @@ plainto_tsquery(?)", params[:topic_title_matches])
+      end
+      
+      if params[:body_matches]
+        q = q.body_matches(params[:body_matches])
+      end
+      
+      if params[:creator_name]
+        q = q.creator_name(params[:creator_name])
+      end
+      
+      q
+    end
+  end
+  
+  extend SearchMethods
   
   def self.new_reply(params)
     if params[:topic_id]