class Node < ActiveRecord::Base
- set_table_name 'current_nodes'
+ require 'xml/libxml'
- belongs_to :user
+ include GeoRecord
+ include ConsistencyValidations
+ include NotRedactable
+ include ObjectMetadata
+ self.table_name = "current_nodes"
+
+ belongs_to :changeset
+
+ has_many :old_nodes, -> { order(:version) }
+
+ has_many :way_nodes
+ has_many :ways, :through => :way_nodes
+
+ has_many :node_tags
+
+ has_many :old_way_nodes
+ has_many :ways_via_history, :class_name => "Way", :through => :old_way_nodes, :source => :way
+
+ has_many :containing_relation_members, :class_name => "RelationMember", :as => :member
+ has_many :containing_relations, :class_name => "Relation", :through => :containing_relation_members, :source => :relation
+
+ validates_presence_of :id, :on => :update
+ validates_presence_of :timestamp, :version, :changeset_id
+ validates_uniqueness_of :id
+ validates_inclusion_of :visible, :in => [true, false]
+ validates_numericality_of :latitude, :longitude, :changeset_id, :version, :integer_only => true
+ validates_numericality_of :id, :on => :update, :integer_only => true
+ validate :validate_position
+ validates_associated :changeset
+
+ scope :visible, -> { where(:visible => true) }
+ scope :invisible, -> { where(:visible => false) }
+
+ # Sanity check the latitude and longitude and add an error if it's broken
+ def validate_position
+ errors.add(:base, "Node is not in the world") unless in_world?
+ end
+
+ # Read in xml as text and return it's Node object representation
+ def self.from_xml(xml, create = false)
+ p = XML::Parser.string(xml)
+ doc = p.parse
+
+ doc.find('//osm/node').each do |pt|
+ return Node.from_xml_node(pt, create)
+ end
+ fail OSM::APIBadXMLError.new("node", xml, "XML doesn't contain an osm/node element.")
+ rescue LibXML::XML::Error, ArgumentError => ex
+ raise OSM::APIBadXMLError.new("node", xml, ex.message)
+ end
+
+ def self.from_xml_node(pt, create = false)
+ node = Node.new
+
+ fail OSM::APIBadXMLError.new("node", pt, "lat missing") if pt['lat'].nil?
+ fail OSM::APIBadXMLError.new("node", pt, "lon missing") if pt['lon'].nil?
+ node.lat = OSM.parse_float(pt['lat'], OSM::APIBadXMLError, "node", pt, "lat not a number")
+ node.lon = OSM.parse_float(pt['lon'], OSM::APIBadXMLError, "node", pt, "lon not a number")
+ fail OSM::APIBadXMLError.new("node", pt, "Changeset id is missing") if pt['changeset'].nil?
+ node.changeset_id = pt['changeset'].to_i
+
+ fail OSM::APIBadUserInput.new("The node is outside this world") unless node.in_world?
+
+ # version must be present unless creating
+ fail OSM::APIBadXMLError.new("node", pt, "Version is required when updating") unless create || !pt['version'].nil?
+ node.version = create ? 0 : pt['version'].to_i
+
+ unless create
+ fail OSM::APIBadXMLError.new("node", pt, "ID is required when updating.") if pt['id'].nil?
+ node.id = pt['id'].to_i
+ # .to_i will return 0 if there is no number that can be parsed.
+ # We want to make sure that there is no id with zero anyway
+ fail OSM::APIBadUserInput.new("ID of node cannot be zero when updating.") if node.id == 0
+ end
+
+ # We don't care about the time, as it is explicitly set on create/update/delete
+ # We don't care about the visibility as it is implicit based on the action
+ # and set manually before the actual delete
+ node.visible = true
+
+ # Start with no tags
+ node.tags = {}
+
+ # Add in any tags from the XML
+ pt.find('tag').each do |tag|
+ fail OSM::APIBadXMLError.new("node", pt, "tag is missing key") if tag['k'].nil?
+ fail OSM::APIBadXMLError.new("node", pt, "tag is missing value") if tag['v'].nil?
+ node.add_tag_key_val(tag['k'], tag['v'])
+ end
+
+ node
+ end
+
+ ##
+ # the bounding box around a node, which is used for determining the changeset's
+ # bounding box
+ def bbox
+ BoundingBox.new(longitude, latitude, longitude, latitude)
+ end
+
+ # Should probably be renamed delete_from to come in line with update
+ def delete_with_history!(new_node, user)
+ unless visible
+ fail OSM::APIAlreadyDeletedError.new("node", new_node.id)
+ end
+
+ # need to start the transaction here, so that the database can
+ # provide repeatable reads for the used-by checks. this means it
+ # shouldn't be possible to get race conditions.
+ Node.transaction do
+ self.lock!
+ check_consistency(self, new_node, user)
+ ways = Way.joins(:way_nodes).where(:visible => true, :current_way_nodes => { :node_id => id }).order(:id)
+ fail OSM::APIPreconditionFailedError.new("Node #{id} is still used by ways #{ways.collect(&:id).join(",")}.") unless ways.empty?
+
+ rels = Relation.joins(:relation_members).where(:visible => true, :current_relation_members => { :member_type => "Node", :member_id => id }).order(:id)
+ fail OSM::APIPreconditionFailedError.new("Node #{id} is still used by relations #{rels.collect(&:id).join(",")}.") unless rels.empty?
+
+ self.changeset_id = new_node.changeset_id
+ self.tags = {}
+ self.visible = false
+
+ # update the changeset with the deleted position
+ changeset.update_bbox!(bbox)
+
+ save_with_history!
+ end
+ end
+
+ def update_from(new_node, user)
+ Node.transaction do
+ self.lock!
+ check_consistency(self, new_node, user)
+
+ # update changeset first
+ self.changeset_id = new_node.changeset_id
+ self.changeset = new_node.changeset
+
+ # update changeset bbox with *old* position first
+ changeset.update_bbox!(bbox)
+
+ # FIXME logic needs to be double checked
+ self.latitude = new_node.latitude
+ self.longitude = new_node.longitude
+ self.tags = new_node.tags
+ self.visible = true
+
+ # update changeset bbox with *new* position
+ changeset.update_bbox!(bbox)
+
+ save_with_history!
+ end
+ end
+
+ def create_with_history(user)
+ check_create_consistency(self, user)
+ self.version = 0
+ self.visible = true
+
+ # update the changeset to include the new location
+ changeset.update_bbox!(bbox)
+
+ save_with_history!
+ end
+
+ def to_xml
+ doc = OSM::API.new.get_xml_doc
+ doc.root << to_xml_node
+ doc
+ end
+
+ def to_xml_node(changeset_cache = {}, user_display_name_cache = {})
+ el = XML::Node.new 'node'
+ el['id'] = id.to_s
+
+ add_metadata_to_xml_node(el, self, changeset_cache, user_display_name_cache)
+
+ if self.visible?
+ el['lat'] = lat.to_s
+ el['lon'] = lon.to_s
+ end
+
+ add_tags_to_xml_node(el, node_tags)
+
+ el
+ end
+
+ def tags_as_hash
+ tags
+ end
+
+ def tags
+ @tags ||= Hash[node_tags.collect { |t| [t.k, t.v] }]
+ end
+
+ attr_writer :tags
+
+ def add_tag_key_val(k, v)
+ @tags = {} unless @tags
+
+ # duplicate tags are now forbidden, so we can't allow values
+ # in the hash to be overwritten.
+ fail OSM::APIDuplicateTagsError.new("node", id, k) if @tags.include? k
+
+ @tags[k] = v
+ end
+
+ ##
+ # are the preconditions OK? this is mainly here to keep the duck
+ # typing interface the same between nodes, ways and relations.
+ def preconditions_ok?
+ in_world?
+ end
+
+ ##
+ # dummy method to make the interfaces of node, way and relation
+ # more consistent.
+ def fix_placeholders!(_id_map, _placeholder_id = nil)
+ # nodes don't refer to anything, so there is nothing to do here
+ end
+
+ private
+
+ def save_with_history!
+ t = Time.now.getutc
+ Node.transaction do
+ self.version += 1
+ self.timestamp = t
+ self.save!
+
+ # Create a NodeTag
+ tags = self.tags
+ NodeTag.delete_all(:node_id => id)
+ tags.each do |k, v|
+ tag = NodeTag.new
+ tag.node_id = id
+ tag.k = k
+ tag.v = v
+ tag.save!
+ end
+
+ # Create an OldNode
+ old_node = OldNode.from_node(self)
+ old_node.timestamp = t
+ old_node.save_with_dependencies!
+
+ # tell the changeset we updated one element only
+ changeset.add_changes! 1
+
+ # save the changeset in case of bounding box updates
+ changeset.save!
+ end
+ end
end
projects / rails.git / blobdiff