-class Way < ActiveRecord::Base
- require 'xml/libxml'
-
- belongs_to :user
- set_table_name 'current_ways'
-
- def self.from_xml(xml, create=false)
- p = XML::Parser.new
- p.string = xml
+# == Schema Information
+#
+# Table name: current_ways
+#
+# id :bigint(8) not null, primary key
+# changeset_id :bigint(8) not null
+# timestamp :datetime not null
+# visible :boolean not null
+# version :bigint(8) not null
+#
+# Indexes
+#
+# current_ways_timestamp_idx (timestamp)
+#
+# Foreign Keys
+#
+# current_ways_changeset_id_fkey (changeset_id => changesets.id)
+#
+
+class Way < ApplicationRecord
+ require "xml/libxml"
+
+ include ConsistencyValidations
+ include NotRedactable
+
+ self.table_name = "current_ways"
+
+ belongs_to :changeset
+
+ has_many :old_ways, -> { order(:version) }, :inverse_of => :current_way
+
+ has_many :way_nodes, -> { order(:sequence_id) }, :inverse_of => :way
+ has_many :nodes, :through => :way_nodes
+
+ has_many :way_tags
+
+ has_many :containing_relation_members, :class_name => "RelationMember", :as => :member
+ has_many :containing_relations, :class_name => "Relation", :through => :containing_relation_members, :source => :relation
+
+ validates :id, :uniqueness => true, :presence => { :on => :update },
+ :numericality => { :on => :update, :only_integer => true }
+ validates :version, :presence => true,
+ :numericality => { :only_integer => true }
+ validates :timestamp, :presence => true
+ validates :changeset, :associated => true
+ validates :visible, :inclusion => [true, false]
+
+ scope :visible, -> { where(:visible => true) }
+ scope :invisible, -> { where(:visible => false) }
+
+ # Read in xml as text and return it's Way object representation
+ def self.from_xml(xml, create: false)
+ p = XML::Parser.string(xml, :options => XML::Parser::Options::NOERROR)
doc = p.parse
+ pt = doc.find_first("//osm/way")
+
+ if pt
+ Way.from_xml_node(pt, :create => create)
+ else
+ raise OSM::APIBadXMLError.new("node", xml, "XML doesn't contain an osm/way element.")
+ end
+ rescue LibXML::XML::Error, ArgumentError => e
+ raise OSM::APIBadXMLError.new("way", xml, e.message)
+ end
+ def self.from_xml_node(pt, create: false)
way = Way.new
- doc.find('//osm/way').each do |pt|
- if !create and pt['id'] != '0'
- way.id = pt['id'].to_i
- end
+ raise OSM::APIBadXMLError.new("way", pt, "Version is required when updating") unless create || !pt["version"].nil?
- if create
- way.timestamp = Time.now
- way.visible = true
- else
- if pt['timestamp']
- way.timestamp = Time.parse(pt['timestamp'])
- end
- end
+ way.version = pt["version"]
+ raise OSM::APIBadXMLError.new("way", pt, "Changeset id is missing") if pt["changeset"].nil?
- pt.find('tag').each do |tag|
- way.add_tag_keyval(tag['k'], tag['v'])
- end
+ way.changeset_id = pt["changeset"]
- pt.find('seg').each do |seg|
- way.add_seg_num(seg['id'])
- end
-
+ unless create
+ raise OSM::APIBadXMLError.new("way", pt, "ID is required when updating") if pt["id"].nil?
+ way.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 way cannot be zero when updating." if way.id.zero?
end
- return way
+ # We don't care about the timestamp nor the visibility as these are either
+ # set explicitly or implicit in the action. The visibility is set to true,
+ # and manually set to false before the actual delete.
+ way.visible = true
+
+ # Start with no tags
+ way.tags = {}
+
+ # Add in any tags from the XML
+ pt.find("tag").each do |tag|
+ raise OSM::APIBadXMLError.new("way", pt, "tag is missing key") if tag["k"].nil?
+ raise OSM::APIBadXMLError.new("way", pt, "tag is missing value") if tag["v"].nil?
+
+ way.add_tag_keyval(tag["k"], tag["v"])
+ end
+
+ pt.find("nd").each do |nd|
+ way.add_nd_num(nd["ref"])
+ end
+
+ way
end
- def segs
- @segs = Array.new unless @segs
- @segs
+ def nds
+ @nds ||= way_nodes.collect(&:node_id)
end
def tags
- @tags = Hash.new unless @tags
- @tags
+ @tags ||= way_tags.to_h { |t| [t.k, t.v] }
end
- def add_seg_num(n)
- @segs = Array.new unless @segs
- @segs << n.to_i
+ attr_writer :nds, :tags
+
+ def add_nd_num(n)
+ @nds ||= []
+ @nds << n.to_i
end
def add_tag_keyval(k, v)
- @tags = Hash.new unless @tags
+ @tags ||= {}
+
+ # duplicate tags are now forbidden, so we can't allow values
+ # in the hash to be overwritten.
+ raise OSM::APIDuplicateTagsError.new("way", id, k) if @tags.include? k
+
@tags[k] = v
end
- def save_with_history
- t = Time.now
- self.timestamp = t
- self.save
-
- WayTag.delete_all(['id = ?', self.id])
-
- self.tags.each do |k,v|
- tag = WayTag.new
- tag.k = k
- tag.v = v
- tag.id = self.id
- tag.save
+ ##
+ # the integer coords (i.e: unscaled) bounding box of the way, assuming
+ # straight line segments.
+ def bbox
+ lons = nodes.collect(&:longitude)
+ lats = nodes.collect(&:latitude)
+ BoundingBox.new(lons.min, lats.min, lons.max, lats.max)
+ end
+
+ def update_from(new_way, user)
+ Way.transaction do
+ lock!
+ check_update_element_consistency(self, new_way, user)
+ raise OSM::APIPreconditionFailedError, "Cannot update way #{id}: data is invalid." unless new_way.preconditions_ok?(nds)
+
+ self.changeset_id = new_way.changeset_id
+ self.changeset = new_way.changeset
+ self.tags = new_way.tags
+ self.nds = new_way.nds
+ self.visible = true
+ save_with_history!
end
+ end
- old_way = OldWay.from_way(self)
- old_way.save
+ def create_with_history(user)
+ check_create_element_consistency(self, user)
+ raise OSM::APIPreconditionFailedError, "Cannot create way: data is invalid." unless preconditions_ok?
+
+ self.version = 0
+ self.visible = true
+ save_with_history!
end
+ def preconditions_ok?(old_nodes = [])
+ return false if nds.empty?
+ raise OSM::APITooManyWayNodesError.new(id, nds.length, Settings.max_number_of_way_nodes) if nds.length > Settings.max_number_of_way_nodes
+
+ # check only the new nodes, for efficiency - old nodes having been checked last time and can't
+ # be deleted when they're in-use.
+ new_nds = (nds - old_nodes).sort.uniq
+
+ unless new_nds.empty?
+ # NOTE: nodes are locked here to ensure they can't be deleted before
+ # the current transaction commits.
+ db_nds = Node.where(:id => new_nds, :visible => true).lock("for share")
+
+ if db_nds.length < new_nds.length
+ missing = new_nds - db_nds.collect(&:id)
+ raise OSM::APIPreconditionFailedError, "Way #{id} requires the nodes with id in (#{missing.join(',')}), which either do not exist, or are not visible."
+ end
+ end
+
+ true
+ end
+
+ def delete_with_history!(new_way, user)
+ raise OSM::APIAlreadyDeletedError.new("way", new_way.id) unless visible
+
+ # 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.
+ Way.transaction do
+ lock!
+ check_update_element_consistency(self, new_way, user)
+ rels = Relation.joins(:relation_members).where(:visible => true, :current_relation_members => { :member_type => "Way", :member_id => id }).order(:id)
+ raise OSM::APIPreconditionFailedError, "Way #{id} is still used by relations #{rels.collect(&:id).join(',')}." unless rels.empty?
+
+ self.changeset_id = new_way.changeset_id
+ self.changeset = new_way.changeset
+
+ self.tags = []
+ self.nds = []
+ self.visible = false
+ save_with_history!
+ end
+ end
+
+ ##
+ # if any referenced nodes are placeholder IDs (i.e: are negative) then
+ # this calling this method will fix them using the map from placeholders
+ # to IDs +id_map+.
+ def fix_placeholders!(id_map, placeholder_id = nil)
+ nds.map! do |node_id|
+ if node_id.negative?
+ new_id = id_map[:node][node_id]
+ raise OSM::APIBadUserInput, "Placeholder node not found for reference #{node_id} in way #{id.nil? ? placeholder_id : id}" if new_id.nil?
+
+ new_id
+ else
+ node_id
+ end
+ end
+ end
+
+ private
+
+ def save_with_history!
+ t = Time.now.utc
+
+ self.version += 1
+ self.timestamp = t
+
+ # update the bounding box, note that this has to be done both before
+ # and after the save, so that nodes from both versions are included in the
+ # bbox. we use a copy of the changeset so that it isn't reloaded
+ # later in the save.
+ cs = changeset
+ cs.update_bbox!(bbox) unless nodes.empty?
+
+ Way.transaction do
+ # clone the object before saving it so that the original is
+ # still marked as dirty if we retry the transaction
+ clone.save!
+
+ tags = self.tags
+ WayTag.where(:way_id => id).delete_all
+ tags.each do |k, v|
+ tag = WayTag.new
+ tag.way_id = id
+ tag.k = k
+ tag.v = v
+ tag.save!
+ end
+
+ nds = self.nds
+ WayNode.where(:way_id => id).delete_all
+ sequence = 1
+ nds.each do |n|
+ nd = WayNode.new
+ nd.id = [id, sequence]
+ nd.node_id = n
+ nd.save!
+ sequence += 1
+ end
+
+ old_way = OldWay.from_way(self)
+ old_way.timestamp = t
+ old_way.save_with_dependencies!
+
+ # reload the way so that the nodes array points to the correct
+ # new set of nodes.
+ reload
+
+ # update and commit the bounding box, now that way nodes
+ # have been updated and we're in a transaction.
+ cs.update_bbox!(bbox) unless nodes.empty?
+
+ # tell the changeset we updated one element only
+ cs.add_changes! 1
+
+ cs.save!
+ end
+ end
end
projects / rails.git / blobdiff