class Way < ActiveRecord::Base
require 'xml/libxml'
- belongs_to :user
+ include ConsistencyValidations
- has_many :way_segments, :foreign_key => 'id', :order => 'sequence_id'
- has_many :way_tags, :foreign_key => 'id'
+ set_table_name 'current_ways'
+
+ belongs_to :changeset
has_many :old_ways, :foreign_key => 'id', :order => 'version'
- set_table_name 'current_ways'
+ has_many :way_nodes, :foreign_key => 'id', :order => 'sequence_id'
+ has_many :nodes, :through => :way_nodes, :order => 'sequence_id'
+
+ has_many :way_tags, :foreign_key => 'id'
+
+ 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 :changeset_id,:version, :timestamp
+ validates_uniqueness_of :id
+ validates_inclusion_of :visible, :in => [ true, false ]
+ validates_numericality_of :changeset_id, :version, :integer_only => true
+ validates_numericality_of :id, :on => :update, :integer_only => true
+ validates_associated :changeset
def self.from_xml(xml, create=false)
begin
- p = XML::Parser.new
- p.string = xml
+ p = XML::Parser.string(xml)
doc = p.parse
- way = Way.new
-
doc.find('//osm/way').each do |pt|
- if !create and pt['id'] != '0'
- way.id = pt['id'].to_i
- end
-
- if create
- way.timestamp = Time.now
- way.visible = true
- else
- if pt['timestamp']
- way.timestamp = Time.parse(pt['timestamp'])
- end
- end
+ return Way.from_xml_node(pt, create)
+ end
+ rescue LibXML::XML::Error, ArgumentError => ex
+ raise OSM::APIBadXMLError.new("way", xml, ex.message)
+ end
+ end
- pt.find('tag').each do |tag|
- way.add_tag_keyval(tag['k'], tag['v'])
- end
+ def self.from_xml_node(pt, create=false)
+ way = Way.new
- pt.find('seg').each do |seg|
- way.add_seg_num(seg['id'])
- end
+ if !create and pt['id'] != '0'
+ way.id = pt['id'].to_i
+ end
+
+ way.version = pt['version']
+ raise OSM::APIBadXMLError.new("node", pt, "Changeset is required") if pt['changeset'].nil?
+ way.changeset_id = pt['changeset']
+
+ # This next section isn't required for the create, update, or delete of ways
+ if create
+ way.timestamp = Time.now.getutc
+ way.visible = true
+ else
+ if pt['timestamp']
+ way.timestamp = Time.parse(pt['timestamp'])
end
- rescue
- way = nil
+ # if visible isn't present then it defaults to true
+ way.visible = (pt['visible'] or true)
+ end
+
+ pt.find('tag').each do |tag|
+ way.add_tag_keyval(tag['k'], tag['v'])
+ end
+
+ pt.find('nd').each do |nd|
+ way.add_nd_num(nd['ref'])
end
return way
end
+ # Find a way given it's ID, and in a single SQL call also grab its nodes
+ #
+
+ # You can't pull in all the tags too unless we put a sequence_id on the way_tags table and have a multipart key
+ def self.find_eager(id)
+ way = Way.find(id, :include => {:way_nodes => :node})
+ #If waytag had a multipart key that was real, you could do this:
+ #way = Way.find(id, :include => [:way_tags, {:way_nodes => :node}])
+ end
+
+ # Find a way given it's ID, and in a single SQL call also grab its nodes and tags
def to_xml
doc = OSM::API.new.get_xml_doc
doc.root << to_xml_node()
return doc
end
- def to_xml_node(visible_segments = nil, user_display_name_cache = nil)
+ def to_xml_node(visible_nodes = nil, user_display_name_cache = nil)
el1 = XML::Node.new 'way'
el1['id'] = self.id.to_s
el1['visible'] = self.visible.to_s
el1['timestamp'] = self.timestamp.xmlschema
+ el1['version'] = self.version.to_s
+ el1['changeset'] = self.changeset_id.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)
+
+ if user_display_name_cache and user_display_name_cache.key?(self.changeset.user_id)
# use the cache if available
- elsif self.user.data_public?
- user_display_name_cache[self.user_id] = self.user.display_name
+ elsif self.changeset.user.data_public?
+ user_display_name_cache[self.changeset.user_id] = self.changeset.user.display_name
else
- user_display_name_cache[self.user_id] = nil
+ user_display_name_cache[self.changeset.user_id] = nil
end
- el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
+ if not user_display_name_cache[self.changeset.user_id].nil?
+ el1['user'] = user_display_name_cache[self.changeset.user_id]
+ el1['uid'] = self.changeset.user_id.to_s
+ end
- # make sure segments are output in sequence_id order
- ordered_segments = []
- self.way_segments.each do |seg|
- if visible_segments
- # if there is a list of visible segments then use that to weed out deleted segments
- if visible_segments[seg.segment_id]
- ordered_segments[seg.sequence_id] = seg.segment_id.to_s
+ # make sure nodes are output in sequence_id order
+ ordered_nodes = []
+ self.way_nodes.each do |nd|
+ if visible_nodes
+ # if there is a list of visible nodes then use that to weed out deleted nodes
+ if visible_nodes[nd.node_id]
+ ordered_nodes[nd.sequence_id] = nd.node_id.to_s
end
else
# otherwise, manually go to the db to check things
- if seg.segment.visible? and seg.segment.from_node.visible? and seg.segment.to_node.visible?
- ordered_segments[seg.sequence_id] = seg.segment_id.to_s
+ if nd.node and nd.node.visible?
+ ordered_nodes[nd.sequence_id] = nd.node_id.to_s
end
end
end
- ordered_segments.each do |seg_id|
- if seg_id and seg_id != '0'
- e = XML::Node.new 'seg'
- e['id'] = seg_id
+ ordered_nodes.each do |nd_id|
+ if nd_id and nd_id != '0'
+ e = XML::Node.new 'nd'
+ e['ref'] = nd_id
el1 << e
end
end
-
+
self.way_tags.each do |tag|
e = XML::Node.new 'tag'
e['k'] = tag.k
return el1
end
- def segs
- unless @segs
- @segs = Array.new
- self.way_segments.each do |seg|
- @segs += [seg.segment_id]
- end
+ def nds
+ unless @nds
+ @nds = Array.new
+ self.way_nodes.each do |nd|
+ @nds += [nd.node_id]
+ end
end
- @segs
+ @nds
end
def tags
unless @tags
- @tags = Hash.new
- self.way_tags.each do |tag|
- @tags[tag.k] = tag.v
- end
+ @tags = {}
+ self.way_tags.each do |tag|
+ @tags[tag.k] = tag.v
+ end
end
@tags
end
- def segs=(s)
- @segs = s
+ def nds=(s)
+ @nds = s
end
def tags=(t)
@tags = t
end
- def add_seg_num(n)
- @segs = Array.new unless @segs
- @segs << n.to_i
+ def add_nd_num(n)
+ @nds = Array.new unless @nds
+ @nds << n.to_i
end
def add_tag_keyval(k, v)
@tags = Hash.new unless @tags
+
+ # duplicate tags are now forbidden, so we can't allow values
+ # in the hash to be overwritten.
+ raise OSM::APIDuplicateTagsError.new("way", self.id, k) if @tags.include? k
+
@tags[k] = v
end
+ ##
+ # the integer coords (i.e: unscaled) bounding box of the way, assuming
+ # straight line segments.
+ def bbox
+ lons = nodes.collect { |n| n.longitude }
+ lats = nodes.collect { |n| n.latitude }
+ [ lons.min, lats.min, lons.max, lats.max ]
+ end
+
+ def update_from(new_way, user)
+ check_consistency(self, new_way, user)
+ if !new_way.preconditions_ok?
+ raise OSM::APIPreconditionFailedError.new
+ end
+
+ 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
+
+ def create_with_history(user)
+ check_create_consistency(self, user)
+ if !self.preconditions_ok?
+ raise OSM::APIPreconditionFailedError.new
+ end
+ self.version = 0
+ self.visible = true
+ save_with_history!
+ end
+
+ def preconditions_ok?
+ return false if self.nds.empty?
+ if self.nds.length > APP_CONFIG['max_number_of_way_nodes']
+ raise OSM::APITooManyWayNodesError.new(self.nds.count, APP_CONFIG['max_number_of_way_nodes'])
+ end
+ self.nds.each do |n|
+ node = Node.find(:first, :conditions => ["id = ?", n])
+ unless node and node.visible
+ raise OSM::APIPreconditionFailedError.new("The node with id #{n} either does not exist, or is not visible")
+ end
+ end
+ return true
+ end
+
+ def delete_with_history!(new_way, user)
+ unless self.visible
+ raise OSM::APIAlreadyDeletedError
+ 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.
+ Way.transaction do
+ check_consistency(self, new_way, user)
+ if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id",
+ :conditions => [ "visible = ? AND member_type='way' and member_id=? ", true, self.id])
+ raise OSM::APIPreconditionFailedError.new("You need to make sure that this way is not a member of a relation.")
+ else
+ self.changeset_id = new_way.changeset_id
+ self.changeset = new_way.changeset
+
+ self.tags = []
+ self.nds = []
+ self.visible = false
+ save_with_history!
+ end
+ end
+ end
+
+ # Find nodes that belong to this way only
+ def unshared_node_ids
+ node_ids = self.nodes.collect { |node| node.id }
+
+ unless node_ids.empty?
+ way_nodes = WayNode.find(:all, :conditions => "node_id in (#{node_ids.join(',')}) and id != #{self.id}")
+ node_ids = node_ids - way_nodes.collect { |way_node| way_node.node_id }
+ end
+
+ return node_ids
+ end
+
+ # Temporary method to match interface to nodes
+ def tags_as_hash
+ return self.tags
+ 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)
+ self.nds.map! do |node_id|
+ if node_id < 0
+ new_id = id_map[:node][node_id]
+ raise "invalid placeholder for #{node_id.inspect}: #{new_id.inspect}" if new_id.nil?
+ new_id
+ else
+ node_id
+ end
+ end
+ end
+
+ private
+
def save_with_history!
- t = Time.now
+ t = Time.now.getutc
+
+ # 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 = self.changeset
+ cs.update_bbox!(bbox) unless nodes.empty?
Way.transaction do
+ self.version += 1
self.timestamp = t
self.save!
- end
- WayTag.transaction do
tags = self.tags
-
WayTag.delete_all(['id = ?', self.id])
-
tags.each do |k,v|
tag = WayTag.new
tag.k = k
tag.id = self.id
tag.save!
end
- end
- WaySegment.transaction do
- segs = self.segs
+ nds = self.nds
+ WayNode.delete_all(['id = ?', self.id])
+ sequence = 1
+ nds.each do |n|
+ nd = WayNode.new
+ nd.id = [self.id, sequence]
+ nd.node_id = n
+ nd.save!
+ sequence += 1
+ end
- WaySegment.delete_all(['id = ?', self.id])
+ old_way = OldWay.from_way(self)
+ old_way.timestamp = t
+ old_way.save_with_dependencies!
- i = 1
- segs.each do |n|
- seg = WaySegment.new
- seg.id = self.id
- seg.segment_id = n
- seg.sequence_id = i
- seg.save!
- i += 1
- end
- end
+ # reload the way so that the nodes array points to the correct
+ # new set of nodes.
+ self.reload
- old_way = OldWay.from_way(self)
- old_way.timestamp = t
- old_way.save_with_dependencies!
- end
+ # 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?
- def preconditions_ok?
- return false if self.segs.empty?
- self.segs.each do |n|
- segment = Segment.find(:first, :conditions => ["id = ?", n])
- unless segment and segment.visible and segment.preconditions_ok?
- return false
- end
+ # tell the changeset we updated one element only
+ cs.add_changes! 1
+
+ cs.save!
end
- return true
end
end
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