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 914e90b7eb43db78c5c2c4bfb29e25602d4d269d..5a8e03ef170ca49880524c3541f6598f47d29137 100644 (file)
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -1,4 +1,195 @@
-class Node < ActiveRecord::Base
+class Node < GeoRecord
+  require 'xml/libxml'
+
   set_table_name 'current_nodes'
+  
+  validates_presence_of :user_id, :timestamp
+  validates_inclusion_of :visible, :in => [ true, false ]
+  validates_numericality_of :latitude, :longitude
+  validate :validate_position
+
+  has_many :old_nodes, :foreign_key => :id
+  has_many :way_nodes
+  has_many :node_tags, :foreign_key => :id
   belongs_to :user
+ 
+  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
+  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
+      p.string = xml
+      doc = p.parse
+  
+      node = Node.new
+
+      doc.find('//osm/node').each do |pt|
+        node.lat = pt['lat'].to_f
+        node.lon = pt['lon'].to_f
+
+        return nil unless node.in_world?
+
+        unless create
+          if pt['id'] != '0'
+            node.id = pt['id'].to_i
+          end
+        end
+
+        node.visible = pt['visible'] and pt['visible'] == 'true'
+
+        if create
+          node.timestamp = Time.now
+        else
+          if pt['timestamp']
+            node.timestamp = Time.parse(pt['timestamp'])
+          end
+        end
+
+        tags = []
+
+        pt.find('tag').each do |tag|
+          node.add_tag_key_val(tag['k'],tag['v'])
+        end
+
+      end
+    rescue
+      node = nil
+    end
+
+    return node
+  end
+
+  def save_with_history!
+    t = Time.now
+
+    Node.transaction do 
+      # apply timestamp to the new node
+      self.timestamp = t
+      self.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
+    doc = OSM::API.new.get_xml_doc
+    doc.root << to_xml_node()
+    return doc
+  end
+
+  def to_xml_node(user_display_name_cache = nil)
+    el1 = XML::Node.new 'node'
+    el1['id'] = self.id.to_s
+    el1['lat'] = self.lat.to_s
+    el1['lon'] = self.lon.to_s
+
+    user_display_name_cache = {} if user_display_name_cache.nil?
+
+    if user_display_name_cache and user_display_name_cache.key?(self.user_id)
+      # use the cache if available
+    elsif self.user.data_public?
+      user_display_name_cache[self.user_id] = self.user.display_name
+    else
+      user_display_name_cache[self.user_id] = nil
+    end
+
+    el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
+
+    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 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