X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/2861236f602b3686deb62add6de0565ba8108fee..283cffdfdbbe31f0a5e6a9dc52b35a8c93a28fb1:/app/models/node.rb

diff --git a/app/models/node.rb b/app/models/node.rb
index 987df9b13..c09fcbd67 100644
--- a/app/models/node.rb
+++ b/app/models/node.rb
@@ -1,200 +1,189 @@
+# == Schema Information
+#
+# Table name: current_nodes
+#
+#  id           :integer          not null, primary key
+#  latitude     :integer          not null
+#  longitude    :integer          not null
+#  changeset_id :integer          not null
+#  visible      :boolean          not null
+#  timestamp    :datetime         not null
+#  tile         :integer          not null
+#  version      :integer          not null
+#
+# Indexes
+#
+#  current_nodes_tile_idx       (tile)
+#  current_nodes_timestamp_idx  (timestamp)
+#
+# Foreign Keys
+#
+#  current_nodes_changeset_id_fkey  (changeset_id => changesets.id)
+#
+
 class Node < ActiveRecord::Base
-  require 'xml/libxml'
+  require "xml/libxml"
 
   include GeoRecord
   include ConsistencyValidations
+  include NotRedactable
+  include ObjectMetadata
 
-  set_table_name 'current_nodes'
+  self.table_name = "current_nodes"
 
   belongs_to :changeset
 
-  has_many :old_nodes, :foreign_key => :id
+  has_many :old_nodes, -> { order(:version) }
 
   has_many :way_nodes
   has_many :ways, :through => :way_nodes
 
-  has_many :node_tags, :foreign_key => :id
-  
+  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 :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, :extend => ObjectFinder
-
-  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
+  has_many :containing_relations, :class_name => "Relation", :through => :containing_relation_members, :source => :relation
+
+  validates :id, :uniqueness => true, :presence => { :on => :update },
+                 :numericality => { :on => :update, :integer_only => true }
+  validates :version, :presence => true,
+                      :numericality => { :integer_only => true }
+  validates :changeset_id, :presence => true,
+                           :numericality => { :integer_only => true }
+  validates :latitude, :presence => true,
+                       :numericality => { :integer_only => true }
+  validates :longitude, :presence => true,
+                        :numericality => { :integer_only => true }
+  validates :timestamp, :presence => true
+  validates :changeset, :associated => true
+  validates :visible, :inclusion => [true, false]
+
   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_to_base("Node is not in the world") unless in_world?
-  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 => true},
-                    :limit => APP_CONFIG['max_number_of_nodes']+1)  
+    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)
-    begin
-      p = XML::Parser.string(xml)
-      doc = p.parse
+  def self.from_xml(xml, create = false)
+    p = XML::Parser.string(xml, :options => XML::Parser::Options::NOERROR)
+    doc = p.parse
 
-      doc.find('//osm/node').each do |pt|
-        return Node.from_xml_node(pt, create)
-      end
-    rescue LibXML::XML::Error, ArgumentError => ex
-      raise OSM::APIBadXMLError.new("node", xml, ex.message)
+    doc.find("//osm/node").each do |pt|
+      return Node.from_xml_node(pt, create)
     end
+    raise 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)
+  def self.from_xml_node(pt, create = false)
     node = Node.new
-    
-    raise OSM::APIBadXMLError.new("node", pt, "lat missing") if pt['lat'].nil?
-    raise OSM::APIBadXMLError.new("node", pt, "lon missing") if pt['lon'].nil?
-    node.lat = pt['lat'].to_f
-    node.lon = pt['lon'].to_f
-    raise OSM::APIBadXMLError.new("node", pt, "changeset id missing") if pt['changeset'].nil?
-    node.changeset_id = pt['changeset'].to_i
 
-    raise OSM::APIBadUserInput.new("The node is outside this world") unless node.in_world?
+    raise OSM::APIBadXMLError.new("node", pt, "lat missing") if pt["lat"].nil?
+    raise 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")
+    raise OSM::APIBadXMLError.new("node", pt, "Changeset id is missing") if pt["changeset"].nil?
+    node.changeset_id = pt["changeset"].to_i
+
+    raise OSM::APIBadUserInput, "The node is outside this world" unless node.in_world?
 
     # version must be present unless creating
-    raise OSM::APIBadXMLError.new("node", pt, "Version is required when updating") unless create or not pt['version'].nil?
-    node.version = create ? 0 : pt['version'].to_i
+    raise 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
-      if pt['id'] != '0'
-        node.id = pt['id'].to_i
-      end
+      raise 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
+      raise OSM::APIBadUserInput, "ID of node cannot be zero when updating." if node.id.zero?
     end
 
-    # visible if it says it is, or as the default if the attribute
-    # is missing.
-    # Don't need to set the visibility, when it is set explicitly in the create/update/delete
-    #node.visible = pt['visible'].nil? or pt['visible'] == 'true'
-
     # We don't care about the time, as it is explicitly set on create/update/delete
-
-    tags = []
-
-    pt.find('tag').each do |tag|
-      node.add_tag_key_val(tag['k'],tag['v'])
+    # 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|
+      raise OSM::APIBadXMLError.new("node", pt, "tag is missing key") if tag["k"].nil?
+      raise OSM::APIBadXMLError.new("node", pt, "tag is missing value") if tag["v"].nil?
+      node.add_tag_key_val(tag["k"], tag["v"])
     end
 
-    return node
+    node
   end
 
   ##
   # the bounding box around a node, which is used for determining the changeset's
   # bounding box
   def bbox
-    [ longitude, latitude, longitude, latitude ]
+    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 self.visible
-      raise OSM::APIAlreadyDeletedError.new("node", new_node.id)
-    end
+    raise OSM::APIAlreadyDeletedError.new("node", new_node.id) unless visible
 
-    # need to start the transaction here, so that the database can 
+    # 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
+      lock!
       check_consistency(self, new_node, user)
-      way = 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 ])
-      raise OSM::APIPreconditionFailedError.new("Node #{self.id} is still used by way #{way.id}.") unless way.nil?
-      
-      rel = 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])
-      raise OSM::APIPreconditionFailedError.new("Node #{self.id} is still used by relation #{rel.relation.id}.") unless rel.nil?
+      ways = Way.joins(:way_nodes).where(:visible => true, :current_way_nodes => { :node_id => id }).order(:id)
+      raise OSM::APIPreconditionFailedError, "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)
+      raise OSM::APIPreconditionFailedError, "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
 
-  # As above but doesn't throw an error if node is used elsewhere - instead, just silently
-  # returns without deleting the node. Potlatch needs this in case you ask to delete an
-  # off-screen node while deleting a way - it doesn't know whether the node is used
-  # elsewhere or not.
-  def delete_with_history_unless_used!(new_node, user)
-    unless self.visible
-      raise OSM::APIAlreadyDeletedError.new("node", new_node.id)
-    end
-
+  def update_from(new_node, user)
     Node.transaction do
+      lock!
       check_consistency(self, new_node, user)
-      way = 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 ])
-      rel = 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])
-      if way.nil? and rel.nil?
-        self.changeset_id = new_node.changeset_id
-        self.visible = false
-        changeset.update_bbox!(bbox)
-        save_with_history!
-      end
-    end
-  end
-
-  def update_from(new_node, user)
-    check_consistency(self, new_node, user)
 
-    # update changeset first
-    self.changeset_id = new_node.changeset_id
-    self.changeset = new_node.changeset
+      # 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);
+      # 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
+      # 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);
+      # update changeset bbox with *new* position
+      changeset.update_bbox!(bbox)
 
-    save_with_history!
+      save_with_history!
+    end
   end
-  
+
   def create_with_history(user)
     check_create_consistency(self, user)
     self.version = 0
@@ -208,75 +197,42 @@ class Node < ActiveRecord::Base
 
   def to_xml
     doc = OSM::API.new.get_xml_doc
-    doc.root << to_xml_node()
-    return doc
+    doc.root << to_xml_node
+    doc
   end
 
   def to_xml_node(changeset_cache = {}, user_display_name_cache = {})
-    el1 = XML::Node.new 'node'
-    el1['id'] = self.id.to_s
-    el1['lat'] = self.lat.to_s
-    el1['lon'] = self.lon.to_s
-    el1['version'] = self.version.to_s
-    el1['changeset'] = self.changeset_id.to_s
-
-    if changeset_cache.key?(self.changeset_id)
-      # use the cache if available
-    else
-      changeset_cache[self.changeset_id] = self.changeset.user_id
-    end
+    el = XML::Node.new "node"
+    el["id"] = id.to_s
 
-    user_id = changeset_cache[self.changeset_id]
+    add_metadata_to_xml_node(el, self, changeset_cache, user_display_name_cache)
 
-    if user_display_name_cache.key?(user_id)
-      # use the cache if available
-    elsif self.changeset.user.data_public?
-      user_display_name_cache[user_id] = self.changeset.user.display_name
-    else
-      user_display_name_cache[user_id] = nil
+    if visible?
+      el["lat"] = lat.to_s
+      el["lon"] = lon.to_s
     end
 
-    if not user_display_name_cache[user_id].nil?
-      el1['user'] = user_display_name_cache[user_id]
-      el1['uid'] = user_id.to_s
-    end
+    add_tags_to_xml_node(el, node_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
+    el
   end
 
   def tags_as_hash
-    return tags
+    tags
   end
 
   def tags
-    unless @tags
-      @tags = {}
-      self.node_tags.each do |tag|
-        @tags[tag.k] = tag.v
-      end
-    end
-    @tags
+    @tags ||= Hash[node_tags.collect { |t| [t.k, t.v] }]
   end
 
-  def tags=(t)
-    @tags = t 
-  end 
+  attr_writer :tags
 
-  def add_tag_key_val(k,v)
-    @tags = Hash.new unless @tags
+  def add_tag_key_val(k, v)
+    @tags ||= {}
 
     # duplicate tags are now forbidden, so we can't allow values
     # in the hash to be overwritten.
-    raise OSM::APIDuplicateTagsError.new("node", self.id, k) if @tags.include? k
+    raise OSM::APIDuplicateTagsError.new("node", id, k) if @tags.include? k
 
     @tags[k] = v
   end
@@ -291,29 +247,33 @@ class Node < ActiveRecord::Base
   ##
   # dummy method to make the interfaces of node, way and relation
   # more consistent.
-  def fix_placeholders!(id_map, placeholder_id = nil)
+  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
+
+    self.version += 1
+    self.timestamp = t
+
     Node.transaction do
-      self.version += 1
-      self.timestamp = t
-      self.save!
+      # clone the object before saving it so that the original is
+      # still marked as dirty if we retry the transaction
+      clone.save!
 
       # Create a NodeTag
       tags = self.tags
-      NodeTag.delete_all(['id = ?', self.id])
-      tags.each do |k,v|
+      NodeTag.where(:node_id => id).delete_all
+      tags.each do |k, v|
         tag = NodeTag.new
-        tag.k = k 
-        tag.v = v 
-        tag.id = self.id
+        tag.node_id = id
+        tag.k = k
+        tag.v = v
         tag.save!
-      end 
+      end
 
       # Create an OldNode
       old_node = OldNode.from_node(self)
@@ -327,5 +287,4 @@ class Node < ActiveRecord::Base
       changeset.save!
     end
   end
-  
 end