class Way < ActiveRecord::Base
require 'xml/libxml'
-
+
belongs_to :user
+
+ has_many :way_nodes, :foreign_key => 'id', :order => 'sequence_id'
+ has_many :way_tags, :foreign_key => 'id'
+
+ has_many :old_ways, :foreign_key => 'id', :order => 'version'
+
set_table_name 'current_ways'
def self.from_xml(xml, create=false)
- p = XML::Parser.new
- p.string = xml
- doc = p.parse
+ begin
+ p = XML::Parser.new
+ p.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
- way = Way.new
+ if create
+ way.timestamp = Time.now
+ way.visible = true
+ else
+ if pt['timestamp']
+ way.timestamp = Time.parse(pt['timestamp'])
+ end
+ end
+
+ pt.find('tag').each do |tag|
+ way.add_tag_keyval(tag['k'], tag['v'])
+ end
- doc.find('//osm/way').each do |pt|
- if !create and pt['id'] != '0'
- way.id = pt['id'].to_i
+ pt.find('nd').each do |nd|
+ way.add_nd_num(nd['ref'])
+ end
end
+ rescue
+ way = nil
+ end
- if create
- way.timestamp = Time.now
- way.visible = true
+ 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})
+ 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_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
+
+ user_display_name_cache = {} if user_display_name_cache.nil?
+
+ if user_display_name_cache and user_display_name_cache.key?(self.user_id)
+ # use the cache if available
+ elsif self.user.data_public?
+ user_display_name_cache[self.user_id] = self.user.display_name
+ else
+ user_display_name_cache[self.user_id] = nil
+ end
+
+ el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
+
+ # 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
- if pt['timestamp']
- way.timestamp = Time.parse(pt['timestamp'])
+ # otherwise, manually go to the db to check things
+ if nd.node.visible? and nd.node.visible?
+ ordered_nodes[nd.sequence_id] = nd.node_id.to_s
end
end
+ end
- pt.find('tag').each do |tag|
- way.add_tag_keyval(tag['k'], tag['v'])
+ 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
- pt.find('seg').each do |seg|
- way.add_seg_num(seg['id'])
+ self.way_tags.each do |tag|
+ e = XML::Node.new 'tag'
+ e['k'] = tag.k
+ e['v'] = tag.v
+ el1 << e
+ end
+ return el1
+ end
+
+ def nds
+ unless @nds
+ @nds = Array.new
+ self.way_nodes.each do |nd|
+ @nds += [nd.node_id]
end
-
-
end
+ @nds
+ end
- return way
+ def tags
+ unless @tags
+ @tags = {}
+ self.way_tags.each do |tag|
+ @tags[tag.k] = tag.v
+ end
+ end
+ @tags
end
- def segs
- @segs = Array.new unless @segs
- @segs
+ def nds=(s)
+ @nds = s
end
- def tags
- @tags = Hash.new unless @tags
- @tags
+ 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[k] = v
end
- def save_with_history
+ 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
+
+ Way.transaction do
+ 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.v = v
+ tag.id = self.id
+ tag.save!
+ end
+ end
+
+ WayNode.transaction do
+ 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
end
old_way = OldWay.from_way(self)
- old_way.save
+ old_way.timestamp = t
+ old_way.save_with_dependencies!
+ end
+
+ def preconditions_ok?
+ return false if self.nds.empty?
+ self.nds.each do |n|
+ node = Node.find(:first, :conditions => ["id = ?", n])
+ unless node and node.visible
+ return false
+ end
+ end
+ return true
end
end
projects / rails.git / blobdiff