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 230c83882cf12fee4ba8d23e5477cdc0e40729bc..cc646b768c1aeb82fd6ce62c0f26724ed5f6a55b 100644 (file)
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -1,5 +1,8 @@
-class Node < ActiveRecord::Base
+# The node model represents a current existing node, that is, the latest version. Use OldNode for historical nodes.
+
+class Node < GeoRecord
   require 'xml/libxml'
+
   set_table_name 'current_nodes'
   
   validates_presence_of :user_id, :timestamp
@@ -7,19 +10,43 @@ class Node < ActiveRecord::Base
   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.latitude < -90 or self.latitude > 90
-    return false if self.longitude < -180 or self.longitude > 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
@@ -29,8 +56,8 @@ class Node < ActiveRecord::Base
       node = Node.new
 
       doc.find('//osm/node').each do |pt|
-        node.latitude = pt['lat'].to_f
-        node.longitude = pt['lon'].to_f
+        node.lat = pt['lat'].to_f
+        node.lon = pt['lon'].to_f
 
         return nil unless node.in_world?
 
@@ -56,10 +83,7 @@ class Node < ActiveRecord::Base
           tags << [tag['k'],tag['v']]
         end
 
-        tags = tags.collect { |k,v| "#{k}=#{v}" }.join(';')
-        tags = '' if tags.nil?
-
-        node.tags = tags
+        node.tags = Tags.join(tags)
       end
     rescue
       node = nil
@@ -68,32 +92,29 @@ class Node < ActiveRecord::Base
     return node
   end
 
-  def save_with_history
-    begin
-      Node.transaction do
-        self.timestamp = Time.now
-        self.save!
-        old_node = OldNode.from_node(self)
-        old_node.save!
-      end
-
-      return true
-    rescue
-      return nil
+  # Save this node with the appropriate OldNode object to represent it's history.
+  def save_with_history!
+    Node.transaction do
+      self.timestamp = Time.now
+      self.save!
+      old_node = OldNode.from_node(self)
+      old_node.save!
     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
-    el1['lat'] = self.latitude.to_s
-    el1['lon'] = self.longitude.to_s
+    el1['lat'] = self.lat.to_s
+    el1['lon'] = self.lon.to_s
 
     user_display_name_cache = {} if user_display_name_cache.nil?
 
@@ -107,25 +128,24 @@ class Node < ActiveRecord::Base
 
     el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
 
-    Node.split_tags(el1, self.tags)
+    Tags.split(self.tags) do |k,v|
+      el2 = XML::Node.new('tag')
+      el2['k'] = k.to_s
+      el2['v'] = v.to_s
+      el1 << el2
+    end
+
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema
     return el1
   end
 
-  def self.split_tags(el, tags)
-    tags.split(';').each do |tag|
-      parts = tag.split('=')
-      key = ''
-      val = ''
-      key = parts[0].strip unless parts[0].nil?
-      val = parts[1].strip unless parts[1].nil?
-      if key != '' && val != ''
-        el2 = XML::Node.new('tag')
-        el2['k'] = key.to_s
-        el2['v'] = val.to_s
-        el << el2
-      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