+# == Schema Information
+#
+# Table name: current_relations
+#
+# 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_relations_timestamp_idx (timestamp)
+#
+# Foreign Keys
+#
+# current_relations_changeset_id_fkey (changeset_id => changesets.id)
+#
+
+class Relation < ApplicationRecord
+ require "xml/libxml"
+
+ include ConsistencyValidations
+ include NotRedactable
+ include ObjectMetadata
+
+ self.table_name = "current_relations"
+
+ belongs_to :changeset
+
+ has_many :old_relations, -> { order(:version) }
+
+ has_many :relation_members, -> { order(:sequence_id) }
+ has_many :relation_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 :changeset_id, :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) }
+ scope :nodes, ->(*ids) { joins(:relation_members).where(:current_relation_members => { :member_type => "Node", :member_id => ids.flatten }) }
+ scope :ways, ->(*ids) { joins(:relation_members).where(:current_relation_members => { :member_type => "Way", :member_id => ids.flatten }) }
+ scope :relations, ->(*ids) { joins(:relation_members).where(:current_relation_members => { :member_type => "Relation", :member_id => ids.flatten }) }
+
+ TYPES = %w[node way relation].freeze
+
+ 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/relation")
+
+ if pt
+ Relation.from_xml_node(pt, create)
+ else
+ raise OSM::APIBadXMLError.new("node", xml, "XML doesn't contain an osm/relation element.")
+ end
+ rescue LibXML::XML::Error, ArgumentError => e
+ raise OSM::APIBadXMLError.new("relation", xml, e.message)
+ end
+
+ def self.from_xml_node(pt, create = false)
+ relation = Relation.new