More tag validations, and finishing the node/way/relation tests.

app/models/node_tag.rb

@@ -5,4 +5,6 @@ class NodeTag < ActiveRecord::Base
   
   validates_presence_of :id
   validates_length_of :k, :v, :maximum => 255, :allow_blank => true
+  validates_uniqueness_of :id, :scope => :k
+  validates_numericality_of :id, :only_integer => true
 end

app/models/old_node_tag.rb

@@ -1,9 +1,10 @@
 class OldNodeTag < ActiveRecord::Base
-  belongs_to :user
-
   set_table_name 'node_tags'
+  
+  belongs_to :user
 
   validates_presence_of :id, :version
   validates_length_of :k, :v, :maximum => 255, :allow_blank => true
-
+  validates_uniqueness_of :id, :scope => [:k, :version]
+  validates_numericality_of :id, :version, :only_integer => true
 end

app/models/old_relation_tag.rb

@@ -1,3 +1,10 @@
 class OldRelationTag < ActiveRecord::Base
   set_table_name 'relation_tags'
+  
+  belongs_to :old_relation, :foreign_key => [:id, :version]
+  
+  validates_presence_of :id, :version
+  validates_length_of :k, :v, :maximum => 255, :allow_blank => true
+  validates_uniqueness_of :id, :scope => [:k, :version]
+  validates_numericality_of :id, :version, :only_integer => true
 end

app/models/old_way_tag.rb

@@ -1,8 +1,8 @@
 class OldWayTag < ActiveRecord::Base
-  belongs_to :old_way
-
   set_table_name 'way_tags'
 
+  belongs_to :old_way, :foreign_key => [:id, :version]
+
   validates_presence_of :id
   validates_length_of :k, :v, :maximum => 255, :allow_blank => true
   validates_uniqueness_of :id, :scope => [:k, :version]