class Relation < ActiveRecord::Base
require 'xml/libxml'
- belongs_to :user
+ include ConsistencyValidations
+
+ set_table_name 'current_relations'
- has_many :relation_members, :foreign_key => 'id'
- has_many :relation_tags, :foreign_key => 'id'
+ belongs_to :changeset
has_many :old_relations, :foreign_key => 'id', :order => 'version'
- set_table_name 'current_relations'
+ has_many :relation_members, :foreign_key => 'id', :order => 'sequence_id'
+ has_many :relation_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 :timestamp,:version, :changeset_id
+ validates_uniqueness_of :id
+ validates_inclusion_of :visible, :in => [ true, false ]
+ validates_numericality_of :id, :on => :update, :integer_only => true
+ validates_numericality_of :changeset_id, :version, :integer_only => true
+ validates_associated :changeset
+
+ TYPES = ["node", "way", "relation"]
def self.from_xml(xml, create=false)
begin
- p = XML::Parser.new
- p.string = xml
+ p = XML::Parser.string(xml)
doc = p.parse
- relation = Relation.new
-
doc.find('//osm/relation').each do |pt|
- if !create and pt['id'] != '0'
- relation.id = pt['id'].to_i
- end
+ return Relation.from_xml_node(pt, create)
+ end
+ rescue LibXML::XML::Error => ex
+ raise OSM::APIBadXMLError.new("relation", xml, ex.message)
+ end
+ end
- if create
- relation.timestamp = Time.now
- relation.visible = true
- else
- if pt['timestamp']
- relation.timestamp = Time.parse(pt['timestamp'])
- end
- end
+ def self.from_xml_node(pt, create=false)
+ relation = Relation.new
- pt.find('tag').each do |tag|
- relation.add_tag_keyval(tag['k'], tag['v'])
- end
+ if !create and pt['id'] != '0'
+ relation.id = pt['id'].to_i
+ end
- pt.find('member').each do |member|
- relation.add_member(member['type'], member['ref'], member['role'])
- end
+ raise OSM::APIBadXMLError.new("relation", pt, "You are missing the required changeset in the relation") if pt['changeset'].nil?
+ relation.changeset_id = pt['changeset']
+
+ # The follow block does not need to be executed because they are dealt with
+ # in create_with_history, update_from and delete_with_history
+ if create
+ relation.timestamp = Time.now
+ relation.visible = true
+ relation.version = 0
+ else
+ if pt['timestamp']
+ relation.timestamp = Time.parse(pt['timestamp'])
end
- rescue
- relation = nil
+ relation.version = pt['version']
end
+ pt.find('tag').each do |tag|
+ relation.add_tag_keyval(tag['k'], tag['v'])
+ end
+
+ pt.find('member').each do |member|
+ #member_type =
+ logger.debug "each member"
+ raise OSM::APIBadXMLError.new("relation", pt, "The #{member['type']} is not allowed only, #{TYPES.inspect} allowed") unless TYPES.include? member['type']
+ logger.debug "after raise"
+ #member_ref = member['ref']
+ #member_role
+ member['role'] ||= "" # Allow the upload to not include this, in which case we default to an empty string.
+ logger.debug member['role']
+ relation.add_member(member['type'], member['ref'], member['role'])
+ end
+ raise OSM::APIBadUserInput.new("Some bad xml in relation") if relation.nil?
+
return relation
end
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
self.relation_members.each do |member|
p=0
return el1
end
+ def self.find_for_nodes(ids, options = {})
+ if ids.empty?
+ return []
+ else
+ self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'node' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+ return self.find(:all, options)
+ end
+ end
+ end
+
+ def self.find_for_ways(ids, options = {})
+ if ids.empty?
+ return []
+ else
+ self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'way' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+ return self.find(:all, options)
+ end
+ end
+ end
+
+ def self.find_for_relations(ids, options = {})
+ if ids.empty?
+ return []
+ else
+ self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'relation' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+ return self.find(:all, options)
+ end
+ end
+ end
+
# FIXME is this really needed?
def members
unless @members
- @members = Array.new
- self.relation_members.each do |member|
- @members += [[member.member_type,member.member_id,member.member_role]]
- end
+ @members = Array.new
+ self.relation_members.each do |member|
+ @members += [[member.member_type,member.member_id,member.member_role]]
+ end
end
@members
end
def tags
unless @tags
- @tags = Hash.new
- self.relation_tags.each do |tag|
- @tags[tag.k] = tag.v
- end
+ @tags = Hash.new
+ self.relation_tags.each do |tag|
+ @tags[tag.k] = tag.v
+ end
end
@tags
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("relation", self.id, k) if @tags.include? k
+
@tags[k] = v
end
+ ##
+ # updates the changeset bounding box to contain the bounding box of
+ # the element with given +type+ and +id+. this only works with nodes
+ # and ways at the moment, as they're the only elements to respond to
+ # the :bbox call.
+ def update_changeset_element(type, id)
+ element = Kernel.const_get(type.capitalize).find(id)
+ changeset.update_bbox! element.bbox
+ end
+
+ def delete_with_history!(new_relation, user)
+ unless self.visible
+ raise OSM::APIAlreadyDeletedError.new
+ 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.
+ Relation.transaction do
+ check_consistency(self, new_relation, user)
+ # This will check to see if this relation is used by another relation
+ if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = ? AND member_type='relation' and member_id=? ", true, self.id ])
+ raise OSM::APIPreconditionFailedError.new("The relation #{new_relation.id} is a used in another relation")
+ end
+ self.changeset_id = new_relation.changeset_id
+ self.tags = {}
+ self.members = []
+ self.visible = false
+ save_with_history!
+ end
+ end
+
+ def update_from(new_relation, user)
+ check_consistency(self, new_relation, user)
+ if !new_relation.preconditions_ok?
+ raise OSM::APIPreconditionFailedError.new
+ end
+ self.changeset_id = new_relation.changeset_id
+ self.tags = new_relation.tags
+ self.members = new_relation.members
+ 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?
+ # These are hastables that store an id in the index of all
+ # the nodes/way/relations that have already been added.
+ # If the member is valid and visible then we add it to the
+ # relevant hash table, with the value true as a cache.
+ # Thus if you have nodes with the ids of 50 and 1 already in the
+ # relation, then the hash table nodes would contain:
+ # => {50=>true, 1=>true}
+ elements = { :node => Hash.new, :way => Hash.new, :relation => Hash.new }
+ self.members.each do |m|
+ # find the hash for the element type or die
+ hash = elements[m[0].to_sym] or return false
+
+ # unless its in the cache already
+ unless hash.key? m[1]
+ # use reflection to look up the appropriate class
+ model = Kernel.const_get(m[0].capitalize)
+
+ # get the element with that ID
+ element = model.find(m[1])
+
+ # and check that it is OK to use.
+ unless element and element.visible? and element.preconditions_ok?
+ return false
+ end
+ hash[m[1]] = true
+ end
+ end
+
+ return true
+ rescue
+ return false
+ end
+
+ # Temporary method to match interface to nodes
+ def tags_as_hash
+ return self.tags
+ end
+
+ ##
+ # if any members are referenced by placeholder IDs (i.e: negative) then
+ # this calling this method will fix them using the map from placeholders
+ # to IDs +id_map+.
+ def fix_placeholders!(id_map)
+ self.members.map! do |type, id, role|
+ old_id = id.to_i
+ if old_id < 0
+ new_id = id_map[type.to_sym][old_id]
+ raise "invalid placeholder" if new_id.nil?
+ [type, new_id, role]
+ else
+ [type, id, role]
+ end
+ end
+ end
+
+ private
+
def save_with_history!
Relation.transaction do
+ # have to be a little bit clever here - to detect if any tags
+ # changed then we have to monitor their before and after state.
+ tags_changed = false
+
t = Time.now
+ self.version += 1
self.timestamp = t
self.save!
tags = self.tags
+ self.relation_tags.each do |old_tag|
+ key = old_tag.k
+ # if we can match the tags we currently have to the list
+ # of old tags, then we never set the tags_changed flag. but
+ # if any are different then set the flag and do the DB
+ # update.
+ if tags.has_key? key
+ # rails 2.1 dirty handling should take care of making this
+ # somewhat efficient... hopefully...
+ old_tag.v = tags[key]
+ tags_changed |= old_tag.changed?
+ old_tag.save!
+
+ # remove from the map, so that we can expect an empty map
+ # at the end if there are no new tags
+ tags.delete key
- RelationTag.delete_all(['id = ?', self.id])
-
+ else
+ # this means a tag was deleted
+ tags_changed = true
+ RelationTag.delete_all ['id = ? and k = ?', self.id, old_tag.k]
+ end
+ end
+ # if there are left-over tags then they are new and will have to
+ # be added.
+ tags_changed |= (not tags.empty?)
tags.each do |k,v|
- tag = RelationTag.new
- tag.k = k
- tag.v = v
- tag.id = self.id
- tag.save!
+ tag = RelationTag.new
+ tag.k = k
+ tag.v = v
+ tag.id = self.id
+ tag.save!
end
- members = self.members
-
- RelationMember.delete_all(['id = ?', self.id])
+ # same pattern as before, but this time we're collecting the
+ # changed members in an array, as the bounding box updates for
+ # elements are per-element, not blanked on/off like for tags.
+ changed_members = Array.new
+ members = Hash.new
+ self.members.each do |m|
+ # should be: h[[m.id, m.type]] = m.role, but someone prefers arrays
+ members[[m[1], m[0]]] = m[2]
+ end
+ relation_members.each do |old_member|
+ key = [old_member.member_id.to_s, old_member.member_type]
+ if members.has_key? key
+ members.delete key
+ else
+ changed_members << key
+ end
+ end
+ # any remaining members must be new additions
+ changed_members += members.keys
- members.each do |n|
- mem = RelationMember.new
- mem.id = self.id
- mem.member_type = n[0];
- mem.member_id = n[1];
- mem.member_role = n[2];
- mem.save!
+ # update the members. first delete all the old members, as the new
+ # members may be in a different order and i don't feel like implementing
+ # a longest common subsequence algorithm to optimise this.
+ members = self.members
+ RelationMember.delete_all(:id => self.id)
+ members.each_with_index do |m,i|
+ mem = RelationMember.new
+ mem.id = [self.id, i]
+ mem.member_type = m[0]
+ mem.member_id = m[1]
+ mem.member_role = m[2]
+ mem.save!
end
old_relation = OldRelation.from_relation(self)
old_relation.timestamp = t
old_relation.save_with_dependencies!
- end
- end
- def preconditions_ok?
- self.members.each do |m|
- if (m[0] == "node")
- n = Node.find(:first, :conditions => ["id = ?", m[1]])
- unless n and n.visible
- return false
- end
- elsif (m[0] == "way")
- w = Way.find(:first, :conditions => ["id = ?", m[1]])
- unless w and w.visible and w.preconditions_ok?
- return false
- end
- elsif (m[0] == "relation")
- e = Relation.find(:first, :conditions => ["id = ?", m[1]])
- unless e and e.visible and e.preconditions_ok?
- return false
+ # update the bbox of the changeset and save it too.
+ # discussion on the mailing list gave the following definition for
+ # the bounding box update procedure of a relation:
+ #
+ # adding or removing nodes or ways from a relation causes them to be
+ # added to the changeset bounding box. adding a relation member or
+ # changing tag values causes all node and way members to be added to the
+ # bounding box. this is similar to how the map call does things and is
+ # reasonable on the assumption that adding or removing members doesn't
+ # materially change the rest of the relation.
+ any_relations =
+ changed_members.collect { |id,type| type == "relation" }.
+ inject(false) { |b,s| b or s }
+
+ if tags_changed or any_relations
+ # add all non-relation bounding boxes to the changeset
+ # FIXME: check for tag changes along with element deletions and
+ # make sure that the deleted element's bounding box is hit.
+ self.members.each do |type, id, role|
+ if type != "relation"
+ update_changeset_element(type, id)
+ end
end
else
- return false
+ # add only changed members to the changeset
+ changed_members.each do |id, type|
+ update_changeset_element(type, id)
+ end
end
+
+ # tell the changeset we updated one element only
+ changeset.add_changes! 1
+
+ # save the (maybe updated) changeset bounding box
+ changeset.save!
end
- return true
- rescue
- return false
end
end
projects / rails.git / blobdiff