Added package.text_search for full-text searching the Package model

app/models/package.rb

@@ -1,3 +1,20 @@
 class Package < ActiveRecord::Base
   has_many :screenshots, :inverse_of=>:package
+
+  # Use PostgreSQL's full-text search capability for the user search
+  def self.text_search(query)
+    if query.present?
+      # Add a rank column to each result
+      rank = <<-RANK
+        ts_rank(to_tsvector(packages.name), plainto_tsquery(#{sanitize(query)}))
+        +
+        ts_rank(to_tsvector(packages.description), plainto_tsquery(#{sanitize(query)}))
+        RANK
+
+      # Do the full-text search and return results by rank
+      where("packages.name @@ :q or packages.description @@ :q", q: query).order("#{rank} desc")
+    else
+      scoped
+    end
+  end
 end