Handle errors a bit better.

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

diff --git a/app/models/segment.rb b/app/models/segment.rb
index 70ce6a4ecf22c09cc9a38f3accb3fd69d6a67ed8..bdb807d9399991cb7faa9ec70898ecccff767345 100644 (file)
--- a/app/models/segment.rb
+++ b/app/models/segment.rb
@@ -2,84 +2,106 @@ class Segment < ActiveRecord::Base
   require 'xml/libxml'
   set_table_name 'current_segments'
 
-  validates_numericality_of :node_a
-  validates_numericality_of :node_b
-  # FIXME validate a nd b exist and are visible
+  validates_presence_of :user_id, :timestamp
+  validates_inclusion_of :visible, :in => [ true, false ]
+  validates_numericality_of :node_a, :node_b
 
   has_many :old_segments, :foreign_key => :id
   belongs_to :user
 
+  # using belongs_to :foreign_key = 'node_*', since if use has_one :foreign_key = 'id', segment preconditions? fails checking for segment id in node table
+  belongs_to :from_node, :class_name => 'Node', :foreign_key => 'node_a'
+  belongs_to :to_node, :class_name => 'Node', :foreign_key => 'node_b'
 
   def self.from_xml(xml, create=false)
-    p = XML::Parser.new
-    p.string = xml
-    doc = p.parse
-
-    segment = Segment.new
+    begin
+      p = XML::Parser.new
+      p.string = xml
+      doc = p.parse
 
-    doc.find('//osm/segment').each do |pt|
+      segment = Segment.new
 
-      segment.node_a = pt['from'].to_i
-      segment.node_b = pt['to'].to_i
+      doc.find('//osm/segment').each do |pt|
+        segment.node_a = pt['from'].to_i
+        segment.node_b = pt['to'].to_i
 
-      if pt['id'] != '0'
-        segment.id = pt['id'].to_i
-      end
+        unless create
+          if pt['id'] != '0'
+            segment.id = pt['id'].to_i
+          end
+        end
 
-      segment.visible = pt['visible'] and pt['visible'] == 'true'
+        segment.visible = true
 
-      if create
-        segment.timestamp = Time.now
-      else
-        if pt['timestamp']
-          segment.timestamp = Time.parse(pt['timestamp'])
+        if create
+          segment.timestamp = Time.now
+        else
+          if pt['timestamp']
+            segment.timestamp = Time.parse(pt['timestamp'])
+          end
         end
-      end
 
-      tags = []
+        tags = []
 
-      pt.find('tag').each do |tag|
-        tags << [tag['k'],tag['v']]
-      end
-
-      tags = tags.collect { |k,v| "#{k}=#{v}" }.join(';')
-      tags = '' if tags.nil?
+        pt.find('tag').each do |tag|
+          tags << [tag['k'],tag['v']]
+        end
 
-      segment.tags = tags
+        tags = tags.collect { |k,v| "#{k}=#{v}" }.join(';')
+        tags = '' if tags.nil?
 
+        segment.tags = tags
+      end
+    rescue
+      segment = nil
     end
+
     return segment
   end
 
   def save_with_history
     begin
       Segment.transaction do
-        self.save
+        self.timestamp = Time.now
+        self.save!
         old_segment = OldSegment.from_segment(self)
-        old_segment.save
+        old_segment.save!
       end
+
       return true
-    rescue Exception => ex
+    rescue
       return nil
     end
   end
 
   def to_xml
-    doc = XML::Document.new
-    doc.encoding = 'UTF-8' 
-    root = XML::Node.new 'osm'
-    root['version'] = '0.4'
-    root['generator'] = 'OpenStreetMap server'
-    doc.root = root
+    doc = OSM::API.new.get_xml_doc
+    doc.root << to_xml_node()
+    return doc
+  end
+
+  def to_xml_node(user_display_name_cache  = nil)
     el1 = XML::Node.new 'segment'
     el1['id'] = self.id.to_s
     el1['from'] = self.node_a.to_s
     el1['to'] = self.node_b.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)
+      # use the cache if available
+    elsif self.user.data_public?
+      user_display_name_cache[self.user_id] = self.user.display_name
+    else
+      user_display_name_cache[self.user_id] = nil
+    end
+
+    el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
+
     Segment.split_tags(el1, self.tags)
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema
-    root << el1
-    return doc
+    return el1
   end
 
   def self.split_tags(el, tags)
@@ -90,7 +112,7 @@ class Segment < ActiveRecord::Base
       key = parts[0].strip unless parts[0].nil?
       val = parts[1].strip unless parts[1].nil?
       if key != '' && val != ''
-        el2 = Segment.new('tag')
+        el2 = XML::Node.new('tag')
         el2['k'] = key.to_s
         el2['v'] = val.to_s
         el << el2
@@ -98,5 +120,8 @@ class Segment < ActiveRecord::Base
     end
   end
 
+  def preconditions_ok?
+    from_node and from_node.visible and to_node and to_node.visible
+  end
 
 end