destroy the feature when we leave

[rails.git] / app / models / node.rb

diff --git a/app/models/node.rb b/app/models/node.rb
index 59aa4d36ffd01ef845896ca1199594253a6ef0fe..cc646b768c1aeb82fd6ce62c0f26724ed5f6a55b 100644 (file)
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -1,3 +1,5 @@
+# The node model represents a current existing node, that is, the latest version. Use OldNode for historical nodes.
+
 class Node < GeoRecord
   require 'xml/libxml'
 
@@ -8,19 +10,43 @@ class Node < GeoRecord
   validates_numericality_of :latitude, :longitude
   validate :validate_position
 
+  has_many :ways, :through => :way_nodes
   has_many :old_nodes, :foreign_key => :id
+  has_many :way_nodes
   belongs_to :user
  
+  # Sanity check the latitude and longitude and add an error if it's broken
   def validate_position
     errors.add_to_base("Node is not in the world") unless in_world?
   end
 
-  def in_world?
-    return false if self.lat < -90 or self.lat > 90
-    return false if self.lon < -180 or self.lon > 180
-    return true
+  #
+  # Search for nodes matching tags within bounding_box
+  #
+  # Also adheres to limitations such as within max_number_of_nodes
+  #
+  def self.search(bounding_box, tags = {})
+    min_lon, min_lat, max_lon, max_lat = *bounding_box
+    # @fixme a bit of a hack to search for only visible nodes
+    # couldn't think of another to add to tags condition
+    #conditions_hash = tags.merge({ 'visible' => 1 })
+  
+    # using named placeholders http://www.robbyonrails.com/articles/2005/10/21/using-named-placeholders-in-ruby
+    #keys = []
+    #values = {}
+
+    #conditions_hash.each do |key,value|
+    #  keys <<  "#{key} = :#{key}"
+    #  values[key.to_sym] = value
+    #end 
+    #conditions = keys.join(' AND ')
+ 
+    find_by_area(min_lat, min_lon, max_lat, max_lon,
+                    :conditions => 'visible = 1',
+                    :limit => APP_CONFIG['max_number_of_nodes']+1)  
   end
 
+  # Read in xml as text and return it's Node object representation
   def self.from_xml(xml, create=false)
     begin
       p = XML::Parser.new
@@ -66,6 +92,7 @@ class Node < GeoRecord
     return node
   end
 
+  # Save this node with the appropriate OldNode object to represent it's history.
   def save_with_history!
     Node.transaction do
       self.timestamp = Time.now
@@ -75,12 +102,14 @@ class Node < GeoRecord
     end
   end
 
+  # Turn this Node in to a complete OSM XML object with <osm> wrapper
   def to_xml
     doc = OSM::API.new.get_xml_doc
     doc.root << to_xml_node()
     return doc
   end
 
+  # Turn this Node in to an XML Node without the <osm> wrapper.
   def to_xml_node(user_display_name_cache = nil)
     el1 = XML::Node.new 'node'
     el1['id'] = self.id.to_s
@@ -110,4 +139,13 @@ class Node < GeoRecord
     el1['timestamp'] = self.timestamp.xmlschema
     return el1
   end
+
+  # Return the node's tags as a Hash of keys and their values
+  def tags_as_hash
+    hash = {}
+    Tags.split(self.tags) do |k,v|
+      hash[k] = v
+    end
+    hash
+  end
 end