Merge pull request #35 from tomhughes/routing

[rails.git] / app / models / old_way.rb

diff --git a/app/models/old_way.rb b/app/models/old_way.rb
index 3f978d3d407ad88ca44bcaf7d9586c61ddbd8db9..dbdcdd46d62dbaf2f0f591b29681c76d3af4f71a 100644 (file)
--- a/app/models/old_way.rb
+++ b/app/models/old_way.rb
@@ -1,14 +1,137 @@
 class OldWay < ActiveRecord::Base
-  set_table_name 'ways'
+  include ConsistencyValidations
+  include ObjectMetadata
 
-  belongs_to :user
+  self.table_name = "ways"
+  self.primary_keys = "way_id", "version"
 
+  # note this needs to be included after the table name changes, or
+  # the queries generated by Redactable will use the wrong table name.
+  include Redactable
+
+  belongs_to :changeset
+  belongs_to :redaction
+  belongs_to :current_way, :class_name => "Way", :foreign_key => "way_id"
+
+  has_many :old_nodes, :class_name => 'OldWayNode', :foreign_key => [:way_id, :version]
+  has_many :old_tags, :class_name => 'OldWayTag', :foreign_key => [:way_id, :version]
+
+  validates_associated :changeset
+  
   def self.from_way(way)
     old_way = OldWay.new
-    old_way.user_id = way.user_id
+    old_way.visible = way.visible
+    old_way.changeset_id = way.changeset_id
     old_way.timestamp = way.timestamp
-    old_way.id = way.id
+    old_way.way_id = way.id
+    old_way.version = way.version
+    old_way.nds = way.nds
+    old_way.tags = way.tags
     return old_way
   end
 
+  def save_with_dependencies!
+    save!
+
+    self.tags.each do |k,v|
+      tag = OldWayTag.new
+      tag.k = k
+      tag.v = v
+      tag.way_id = self.way_id
+      tag.version = self.version
+      tag.save!
+    end
+
+    sequence = 1
+    self.nds.each do |n|
+      nd = OldWayNode.new
+      nd.id = [self.way_id, self.version, sequence]
+      nd.node_id = n
+      nd.save!
+      sequence += 1
+    end
+  end
+
+  def nds
+    @nds ||= self.old_nodes.order(:sequence_id).collect { |n| n.node_id }
+  end
+
+  def tags
+    @tags ||= Hash[self.old_tags.collect { |t| [t.k, t.v] }]
+  end
+
+  def nds=(s)
+    @nds = s
+  end
+
+  def tags=(t)
+    @tags = t
+  end
+
+  def to_xml_node(changeset_cache = {}, user_display_name_cache = {})
+    el = XML::Node.new 'way'
+    el['id'] = self.way_id.to_s
+
+    add_metadata_to_xml_node(el, self, changeset_cache, user_display_name_cache)
+
+    self.old_nodes.each do |nd| # FIXME need to make sure they come back in the right order
+      node_el = XML::Node.new 'nd'
+      node_el['ref'] = nd.node_id.to_s
+      el << node_el
+    end
+      
+    add_tags_to_xml_node(el, self.old_tags)
+
+    return el
+  end
+
+  # Read full version of old way
+  # For get_nodes_undelete, uses same nodes, even if they've moved since
+  # For get_nodes_revert,   allocates new ids 
+  # Currently returns Potlatch-style array
+  # where [5] indicates whether latest version is usable as is (boolean)
+  # (i.e. is it visible? are we actually reverting to an earlier version?)
+
+  def get_nodes_undelete
+    self.nds.collect do |n|
+      node = Node.find(n)
+      [node.lon, node.lat, n, node.version, node.tags_as_hash, node.visible]
+    end
+  end
+  
+  def get_nodes_revert(timestamp)
+    points=[]
+    self.nds.each do |n|
+      oldnode = OldNode.where('node_id = ? AND timestamp <= ?', n, timestamp).unredacted.order("timestamp DESC").first
+      curnode = Node.find(n)
+      id = n; reuse = curnode.visible
+      if oldnode.lat != curnode.lat or oldnode.lon != curnode.lon or oldnode.tags != curnode.tags then
+        # node has changed: if it's in other ways, give it a new id
+        if curnode.ways-[self.way_id] then id=-1; reuse=false end
+      end
+      points << [oldnode.lon, oldnode.lat, id, curnode.version, oldnode.tags_as_hash, reuse]
+    end
+    points
+  end
+
+  # Temporary method to match interface to nodes
+  def tags_as_hash
+    return self.tags
+  end
+
+  # Temporary method to match interface to ways
+  def way_nodes
+    return self.old_nodes
+  end
+
+  # Pretend we're not in any relations
+  def containing_relation_members
+    return []
+  end
+
+  # check whether this element is the latest version - that is,
+  # has the same version as its "current" counterpart.
+  def is_latest_version?
+    current_way.version == self.version
+  end
 end