1 class Node < ActiveRecord::Base
5 include ConsistencyValidations
7 set_table_name 'current_nodes'
11 has_many :old_nodes, :foreign_key => :id
14 has_many :ways, :through => :way_nodes
16 has_many :node_tags, :foreign_key => :id
18 has_many :old_way_nodes
19 has_many :ways_via_history, :class_name=> "Way", :through => :old_way_nodes, :source => :way
21 has_many :containing_relation_members, :class_name => "RelationMember", :as => :member
22 has_many :containing_relations, :class_name => "Relation", :through => :containing_relation_members, :source => :relation, :extend => ObjectFinder
24 validates_presence_of :id, :on => :update
25 validates_presence_of :timestamp,:version, :changeset_id
26 validates_uniqueness_of :id
27 validates_inclusion_of :visible, :in => [ true, false ]
28 validates_numericality_of :latitude, :longitude, :changeset_id, :version, :integer_only => true
29 validates_numericality_of :id, :on => :update, :integer_only => true
30 validate :validate_position
31 validates_associated :changeset
33 # Sanity check the latitude and longitude and add an error if it's broken
35 errors.add_to_base("Node is not in the world") unless in_world?
39 # Search for nodes matching tags within bounding_box
41 # Also adheres to limitations such as within max_number_of_nodes
43 def self.search(bounding_box, tags = {})
44 min_lon, min_lat, max_lon, max_lat = *bounding_box
45 # @fixme a bit of a hack to search for only visible nodes
46 # couldn't think of another to add to tags condition
47 #conditions_hash = tags.merge({ 'visible' => 1 })
49 # using named placeholders http://www.robbyonrails.com/articles/2005/10/21/using-named-placeholders-in-ruby
53 #conditions_hash.each do |key,value|
54 # keys << "#{key} = :#{key}"
55 # values[key.to_sym] = value
57 #conditions = keys.join(' AND ')
59 find_by_area(min_lat, min_lon, max_lat, max_lon,
60 :conditions => {:visible => true},
61 :limit => APP_CONFIG['max_number_of_nodes']+1)
64 # Read in xml as text and return it's Node object representation
65 def self.from_xml(xml, create=false)
71 doc.find('//osm/node').each do |pt|
72 return Node.from_xml_node(pt, create)
79 def self.from_xml_node(pt, create=false)
82 node.lat = pt['lat'].to_f
83 node.lon = pt['lon'].to_f
84 node.changeset_id = pt['changeset'].to_i
86 return nil unless node.in_world?
88 # version must be present unless creating
89 return nil unless create or not pt['version'].nil?
90 node.version = create ? 0 : pt['version'].to_i
94 node.id = pt['id'].to_i
98 # visible if it says it is, or as the default if the attribute
100 node.visible = pt['visible'].nil? or pt['visible'] == 'true'
103 node.timestamp = Time.now
106 node.timestamp = Time.parse(pt['timestamp'])
112 pt.find('tag').each do |tag|
113 node.add_tag_key_val(tag['k'],tag['v'])
120 # the bounding box around a node
122 [ longitude, latitude, longitude, latitude ]
125 def save_with_history!
134 NodeTag.delete_all(['id = ?', self.id])
144 old_node = OldNode.from_node(self)
145 old_node.timestamp = t
146 old_node.save_with_dependencies!
148 # tell the changeset we updated one element only
149 changeset.add_changes! 1
151 # save the changeset in case of bounding box updates
156 # Should probably be renamed delete_from to come in line with update
157 def delete_with_history!(new_node, user)
159 raise OSM::APIAlreadyDeletedError.new
162 # need to start the transaction here, so that the database can
163 # provide repeatable reads for the used-by checks. this means it
164 # shouldn't be possible to get race conditions.
166 check_consistency(self, new_node, user)
167 if WayNode.find(:first, :joins => "INNER JOIN current_ways ON current_ways.id = current_way_nodes.id", :conditions => [ "current_ways.visible = ? AND current_way_nodes.node_id = ?", true, self.id ])
168 raise OSM::APIPreconditionFailedError.new
169 elsif RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = ? AND member_type='node' and member_id=? ", true, self.id])
170 raise OSM::APIPreconditionFailedError.new
172 self.changeset_id = new_node.changeset_id
175 # update the changeset with the deleted position
176 changeset.update_bbox!(bbox)
183 def update_from(new_node, user)
184 check_consistency(self, new_node, user)
186 # update changeset with *old* position first
187 changeset.update_bbox!(bbox);
189 # FIXME logic needs to be double checked
190 self.changeset_id = new_node.changeset_id
191 self.latitude = new_node.latitude
192 self.longitude = new_node.longitude
193 self.tags = new_node.tags
196 # update changeset with *new* position
197 changeset.update_bbox!(bbox);
202 def create_with_history(user)
203 check_create_consistency(self, user)
207 # update the changeset to include the new location
208 changeset.update_bbox!(bbox)
214 doc = OSM::API.new.get_xml_doc
215 doc.root << to_xml_node()
219 def to_xml_node(user_display_name_cache = nil)
220 el1 = XML::Node.new 'node'
221 el1['id'] = self.id.to_s
222 el1['lat'] = self.lat.to_s
223 el1['lon'] = self.lon.to_s
224 el1['version'] = self.version.to_s
225 el1['changeset'] = self.changeset_id.to_s
227 user_display_name_cache = {} if user_display_name_cache.nil?
229 if user_display_name_cache and user_display_name_cache.key?(self.changeset.user_id)
230 # use the cache if available
231 elsif self.changeset.user.data_public?
232 user_display_name_cache[self.changeset.user_id] = self.changeset.user.display_name
234 user_display_name_cache[self.changeset.user_id] = nil
237 if not user_display_name_cache[self.changeset.user_id].nil?
238 el1['user'] = user_display_name_cache[self.changeset.user_id]
239 el1['uid'] = self.changeset.user_id.to_s
242 self.tags.each do |k,v|
243 el2 = XML::Node.new('tag')
249 el1['visible'] = self.visible.to_s
250 el1['timestamp'] = self.timestamp.xmlschema
261 self.node_tags.each do |tag|
272 def add_tag_key_val(k,v)
273 @tags = Hash.new unless @tags
275 # duplicate tags are now forbidden, so we can't allow values
276 # in the hash to be overwritten.
277 raise OSM::APIDuplicateTagsError.new if @tags.include? k
283 # are the preconditions OK? this is mainly here to keep the duck
284 # typing interface the same between nodes, ways and relations.
285 def preconditions_ok?
290 # dummy method to make the interfaces of node, way and relation
292 def fix_placeholders!(id_map)
293 # nodes don't refer to anything, so there is nothing to do here