change module sintax

app/models/collections/public_context.rb

 ##
 # This class represents an specification for listing collections
 # The PublicContext class specify all collections with field privacy=public
-class Collections::PublicContext < Context
+module Collections
+  class PublicContext < Context
 
-  def from
-    'Collection'
-  end
+    def from
+      'Collection'
+    end
 
-  def privacy
-    'public'
-  end
+    def privacy
+      'public'
+    end
 
+  end
 end
\ No newline at end of file

app/models/collections/user_context.rb

-class UserContext < Context
+module Collections
+  class UserContext < Context
 
-  def initialize(user)
-    @user = user
-  end
+    def initialize(user)
+      @user = user
+    end
 
-  def from
-    sprintf "select expand(in('BelongsTo')) from %s)", @user.rid
-  end
+    def from
+      sprintf "select expand(in('BelongsTo')) from %s)", @user.rid
+    end
 
+  end
 end
\ No newline at end of file

app/models/collections/user_private_context.rb

 ##
 # This class represents an specification for listing collections
 # The PublicContext class specify all collections with field privacy=public
-class Collections::UserPrivateContext < UserContext
+module Collections
+  class UserPrivateContext < UserContext
 
-  def privacy
-    'private'
-  end
+    def privacy
+      'private'
+    end
 
+  end
 end
\ No newline at end of file

app/models/collections/user_public_context.rb

 ##
 # This class represents an specification for listing collections
 # The PublicContext class specify all collections with field privacy=public
-class Collections::UserPublicContext < UserContext
+module Collections
+  class UserPublicContext < UserContext
 
-  def privacy
-    'public'
-  end
+    def privacy
+      'public'
+    end
 
+  end
 end
\ No newline at end of file