Standardise on double quoted strings
[rails.git] / app / models / old_relation.rb
1 class OldRelation < ActiveRecord::Base
2   include ConsistencyValidations
3   include ObjectMetadata
4
5   self.table_name = "relations"
6   self.primary_keys = "relation_id", "version"
7
8   # note this needs to be included after the table name changes, or
9   # the queries generated by Redactable will use the wrong table name.
10   include Redactable
11
12   belongs_to :changeset
13   belongs_to :redaction
14   belongs_to :current_relation, :class_name => "Relation", :foreign_key => "relation_id"
15
16   has_many :old_members, -> { order(:sequence_id) }, :class_name => "OldRelationMember", :foreign_key => [:relation_id, :version]
17   has_many :old_tags, :class_name => "OldRelationTag", :foreign_key => [:relation_id, :version]
18
19   validates_associated :changeset
20
21   def self.from_relation(relation)
22     old_relation = OldRelation.new
23     old_relation.visible = relation.visible
24     old_relation.changeset_id = relation.changeset_id
25     old_relation.timestamp = relation.timestamp
26     old_relation.relation_id = relation.id
27     old_relation.version = relation.version
28     old_relation.members = relation.members
29     old_relation.tags = relation.tags
30     old_relation
31   end
32
33   def save_with_dependencies!
34     save!
35
36     tags.each do |k, v|
37       tag = OldRelationTag.new
38       tag.k = k
39       tag.v = v
40       tag.relation_id = relation_id
41       tag.version = version
42       tag.save!
43     end
44
45     members.each_with_index do |m, i|
46       member = OldRelationMember.new
47       member.id = [relation_id, version, i]
48       member.member_type = m[0].classify
49       member.member_id = m[1]
50       member.member_role = m[2]
51       member.save!
52     end
53   end
54
55   def members
56     @members ||= old_members.collect do |member|
57       [member.member_type, member.member_id, member.member_role]
58     end
59   end
60
61   def tags
62     @tags ||= Hash[old_tags.collect { |t| [t.k, t.v] }]
63   end
64
65   attr_writer :members
66
67   attr_writer :tags
68
69   def to_xml
70     doc = OSM::API.new.get_xml_doc
71     doc.root << to_xml_node
72     doc
73   end
74
75   def to_xml_node(changeset_cache = {}, user_display_name_cache = {})
76     el = XML::Node.new "relation"
77     el["id"] = relation_id.to_s
78
79     add_metadata_to_xml_node(el, self, changeset_cache, user_display_name_cache)
80
81     old_members.each do |member|
82       member_el = XML::Node.new "member"
83       member_el["type"] = member.member_type.to_s.downcase
84       member_el["ref"] = member.member_id.to_s # "id" is considered uncool here as it should be unique in XML
85       member_el["role"] = member.member_role.to_s
86       el << member_el
87     end
88
89     add_tags_to_xml_node(el, old_tags)
90
91     el
92   end
93
94   # Temporary method to match interface to nodes
95   def tags_as_hash
96     tags
97   end
98
99   # Temporary method to match interface to relations
100   def relation_members
101     old_members
102   end
103
104   # Pretend we're not in any relations
105   def containing_relation_members
106     []
107   end
108
109   # check whether this element is the latest version - that is,
110   # has the same version as its "current" counterpart.
111   def is_latest_version?
112     current_relation.version == version
113   end
114 end