merged node and old node models for normalised node tags

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

diff --git a/app/models/node.rb b/app/models/node.rb
index f9210bf0664a88a296a8c41e200d88fb9e8652a2..5a8e03ef170ca49880524c3541f6598f47d29137 100644 (file)
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -1,5 +1,6 @@
-class Node < ActiveRecord::Base
+class Node < GeoRecord
   require 'xml/libxml'
+
   set_table_name 'current_nodes'
   
   validates_presence_of :user_id, :timestamp
@@ -8,36 +9,10 @@ class Node < ActiveRecord::Base
   validate :validate_position
 
   has_many :old_nodes, :foreign_key => :id
+  has_many :way_nodes
+  has_many :node_tags, :foreign_key => :id
   belongs_to :user
  
-  before_save :update_tile
-
-  def self.find_by_area(minlat, minlon, maxlat, maxlon, options)
-    self.with_scope(:find => {:conditions => OSM.sql_for_area(minlat, minlon, maxlat, maxlon)}) do
-      return self.find(:all, options)
-    end
-  end
-
-  def update_tile
-    self.tile = QuadTile.tile_for_point(lat, lon)
-  end
-
-  def lat=(l)
-    self.latitude = (l * 10000000).round
-  end
-
-  def lon=(l)
-    self.longitude = (l * 10000000).round
-  end
-
-  def lat
-    return self.latitude.to_f / 10000000
-  end
-
-  def lon
-    return self.longitude.to_f / 10000000
-  end
-
   def validate_position
     errors.add_to_base("Node is not in the world") unless in_world?
   end
@@ -48,6 +23,33 @@ class Node < ActiveRecord::Base
     return true
   end
 
+  #
+  # 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
@@ -81,13 +83,9 @@ class Node < ActiveRecord::Base
         tags = []
 
         pt.find('tag').each do |tag|
-          tags << [tag['k'],tag['v']]
+          node.add_tag_key_val(tag['k'],tag['v'])
         end
 
-        tags = tags.collect { |k,v| "#{k}=#{v}" }.join(';')
-        tags = '' if tags.nil?
-
-        node.tags = tags
       end
     rescue
       node = nil
@@ -97,12 +95,36 @@ class Node < ActiveRecord::Base
   end
 
   def save_with_history!
-    Node.transaction do
-      self.timestamp = Time.now
+    t = Time.now
+
+    Node.transaction do 
+      # apply timestamp to the new node
+      self.timestamp = t
       self.save!
-      old_node = OldNode.from_node(self)
-      old_node.save!
     end
+
+    # Create a NodeTag
+    NodeTag.transaction do 
+      tags = self.tags
+
+      NodeTag.delete_all(['id = ?', self.id])
+
+      sequence_id = 1
+      tags.each do |k,v|
+        tag = NodeTag.new
+        tag.k = k 
+        tag.v = v 
+        tag.id = self.id
+        tag.sequence_id = sequence_id
+        tag.save!
+        sequence_id += 1
+      end 
+    end 
+    # Create an OldNode
+    old_node = OldNode.from_node(self)
+    old_node.timestamp = t
+    old_node.save_with_dependencies!
+
   end
 
   def to_xml
@@ -129,25 +151,45 @@ 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)
+    self.tags.each 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
+  def tags_as_hash
+    hash = {}
+    Tags.split(self.tags) do |k,v|
+      hash[k] = v
+    end
+    hash
+  end
+
+  def tags
+    unless @tags
+      @tags = {}
+      self.node_tags.each do |tag|
+        @tags[tag.k] = tag.v
       end
     end
+    @tags
+  end
+
+  def tags=(t)
+    @tags = t 
+  end 
+
+  def add_tag_key_val(k,v)
+    @tags = Hash.new unless @tags
+    @tags[k] = v
   end
+
+
+
 end