class Relation < ActiveRecord::Base
require 'xml/libxml'
- belongs_to :user
+ 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'
+ 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
def self.from_xml(xml, create=false)
begin
p.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
+ return nil
+ 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
+ relation.version = pt['version']
+
+ if create
+ relation.timestamp = Time.now
+ relation.visible = true
+ else
+ if pt['timestamp']
+ relation.timestamp = Time.parse(pt['timestamp'])
end
- rescue
- relation = nil
+ end
+
+ pt.find('tag').each do |tag|
+ relation.add_tag_keyval(tag['k'], tag['v'])
+ end
+
+ pt.find('member').each do |member|
+ relation.add_member(member['type'], member['ref'], member['role'])
end
return relation
return el1
end
-
- # collect relationships. currently done in one big block at the end;
- # may need to move this upwards if people want automatic completion of
- # relationships, i.e. deliver referenced objects like we do with ways...
- # FIXME: rip out the fucking SQL
- def self.find_for_nodes_and_ways(node_ids, way_ids)
- relations = []
-
- if node_ids.length > 0
- relations += Relation.find_by_sql("select e.* from current_relations e,current_relation_members em where " +
- "e.visible=1 and " +
- "em.id = e.id and em.member_type='node' and em.member_id in (#{node_ids.join(',')})")
- end
- if way_ids.length > 0
- relations += Relation.find_by_sql("select e.* from current_relations e,current_relation_members em where " +
- "e.visible=1 and " +
- "em.id = e.id and em.member_type='way' and em.member_id in (#{way_ids.join(',')})")
+ 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
- relations # if you don't do this then it returns nil and not []
+ 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
end
end
+ def delete_with_history(user)
+ if self.visible
+ if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = 1 AND member_type='relation' and member_id=?", self.id ])
+ raise OSM::APIPreconditionFailedError.new
+ else
+ self.user_id = user.id
+ self.tags = []
+ self.members = []
+ self.visible = false
+ save_with_history!
+ end
+ else
+ raise OSM::APIAlreadyDeletedError.new
+ end
+ end
+
+ def update_from(new_relation, user)
+ if !new_relation.preconditions_ok?
+ raise OSM::APIPreconditionFailedError.new
+ elsif new_relation.version != version
+ raise OSM::APIVersionMismatchError.new(new_relation.version, version)
+ else
+ self.user_id = user.id
+ self.tags = new_relation.tags
+ self.members = new_relation.members
+ self.visible = true
+ save_with_history!
+ end
+ 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.
+ # Once we know the id of the node/way/relation exists
+ # we check to see if it is already existing in the hashtable
+ # if it does, then we return false. Otherwise
+ # we add it to the relevant hash table, with the value true..
+ # 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}
+ nodes = Hash.new
+ ways = Hash.new
+ relations = Hash.new
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
+ if nodes[m[1]]
+ return false
+ else
+ nodes[m[1]] = true
+ 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
+ if ways[m[1]]
+ return false
+ else
+ ways[m[1]] = true
+ end
elsif (m[0] == "relation")
e = Relation.find(:first, :conditions => ["id = ?", m[1]])
unless e and e.visible and e.preconditions_ok?
return false
end
+ if relations[m[1]]
+ return false
+ else
+ relations[m[1]] = true
+ end
else
return false
end
return false
end
+ # Temporary method to match interface to nodes
+ def tags_as_hash
+ return self.tags
+ end
end
projects / rails.git / blobdiff