List all objects that are blocking a delete, in a well defined order

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

diff --git a/app/models/way.rb b/app/models/way.rb
index b1057f673fadaf222ae245da0485277db3901c6f..23475785c88f1ecc069268f6df85dd2e76fd730c 100644 (file)
--- a/app/models/way.rb
+++ b/app/models/way.rb
@@ -25,6 +25,10 @@ class Way < ActiveRecord::Base
   validates_numericality_of :id, :on => :update, :integer_only => true
   validates_associated :changeset
 
   validates_numericality_of :id, :on => :update, :integer_only => true
   validates_associated :changeset
 

+  scope :visible, where(:visible => true)
+  scope :invisible, where(:visible => false)
+
+  # Read in xml as text and return it's Way object representation

   def self.from_xml(xml, create=false)
     begin
       p = XML::Parser.string(xml)
   def self.from_xml(xml, create=false)
     begin
       p = XML::Parser.string(xml)


@@ -33,6 +37,7 @@ class Way < ActiveRecord::Base
       doc.find('//osm/way').each do |pt|
         return Way.from_xml_node(pt, create)
       end
       doc.find('//osm/way').each do |pt|
         return Way.from_xml_node(pt, create)
       end

+      raise OSM::APIBadXMLError.new("node", xml, "XML doesn't contain an osm/way element.")

     rescue LibXML::XML::Error, ArgumentError => ex
       raise OSM::APIBadXMLError.new("way", xml, ex.message)
     end
     rescue LibXML::XML::Error, ArgumentError => ex
       raise OSM::APIBadXMLError.new("way", xml, ex.message)
     end


@@ -41,27 +46,27 @@ class Way < ActiveRecord::Base
   def self.from_xml_node(pt, create=false)
     way = Way.new
 
   def self.from_xml_node(pt, create=false)
     way = Way.new
 

-    if !create and pt['id'] != '0'
-      way.id = pt['id'].to_i
-    end
-    
+    raise OSM::APIBadXMLError.new("way", pt, "Version is required when updating") unless create or not pt['version'].nil?

     way.version = pt['version']
     way.version = pt['version']

-    raise OSM::APIBadXMLError.new("node", pt, "Changeset is required") if pt['changeset'].nil?
+    raise OSM::APIBadXMLError.new("way", pt, "Changeset id is missing") if pt['changeset'].nil?

     way.changeset_id = pt['changeset']
 
     way.changeset_id = pt['changeset']
 

-    # This next section isn't required for the create, update, or delete of ways
-    if create
-      way.timestamp = Time.now.getutc
-      way.visible = true
-    else
-      if pt['timestamp']
-        way.timestamp = Time.parse(pt['timestamp'])
-      end
-      # if visible isn't present then it defaults to true
-      way.visible = (pt['visible'] or true)
+    unless create
+      raise OSM::APIBadXMLError.new("way", pt, "ID is required when updating") if pt['id'].nil?
+      way.id = pt['id'].to_i
+      # .to_i will return 0 if there is no number that can be parsed. 
+      # We want to make sure that there is no id with zero anyway
+      raise OSM::APIBadUserInput.new("ID of way cannot be zero when updating.") if way.id == 0

     end
 
     end
 

+    # We don't care about the timestamp nor the visibility as these are either
+    # set explicitly or implicit in the action. The visibility is set to true, 
+    # and manually set to false before the actual delete.
+    way.visible = true
+

     pt.find('tag').each do |tag|
     pt.find('tag').each do |tag|

+      raise OSM::APIBadXMLError.new("way", pt, "tag is missing key") if tag['k'].nil?
+      raise OSM::APIBadXMLError.new("way", pt, "tag is missing value") if tag['v'].nil?

       way.add_tag_keyval(tag['k'], tag['v'])
     end
 
       way.add_tag_keyval(tag['k'], tag['v'])
     end
 


@@ -191,11 +196,6 @@ class Way < ActiveRecord::Base
     # in the hash to be overwritten.
     raise OSM::APIDuplicateTagsError.new("way", self.id, k) if @tags.include? k
 
     # in the hash to be overwritten.
     raise OSM::APIDuplicateTagsError.new("way", self.id, k) if @tags.include? k
 

-    # check tag size here, as we don't create a WayTag object until
-    # just before we save...
-    raise OSM::APIBadUserInput.new("Way #{self.id} has a tag with too long a key, '#{k}'.") if k.length > 255
-    raise OSM::APIBadUserInput.new("Way #{self.id} has a tag with too long a value, '#{k}'='#{v}'.") if v.length > 255
-

     @tags[k] = v
   end
 
     @tags[k] = v
   end
 


@@ -209,17 +209,20 @@ class Way < ActiveRecord::Base
   end
 
   def update_from(new_way, user)
   end
 
   def update_from(new_way, user)

-    check_consistency(self, new_way, user)
-    unless new_way.preconditions_ok?(self.nds)
-      raise OSM::APIPreconditionFailedError.new("Cannot update way #{self.id}: data is invalid.")
+    Way.transaction do
+      self.lock!
+      check_consistency(self, new_way, user)
+      unless new_way.preconditions_ok?(self.nds)
+        raise OSM::APIPreconditionFailedError.new("Cannot update way #{self.id}: data is invalid.")
+      end
+      
+      self.changeset_id = new_way.changeset_id
+      self.changeset = new_way.changeset
+      self.tags = new_way.tags
+      self.nds = new_way.nds
+      self.visible = true
+      save_with_history!

     end
     end

-
-    self.changeset_id = new_way.changeset_id
-    self.changeset = new_way.changeset
-    self.tags = new_way.tags
-    self.nds = new_way.nds
-    self.visible = true
-    save_with_history!

   end
 
   def create_with_history(user)
   end
 
   def create_with_history(user)


@@ -234,22 +237,23 @@ class Way < ActiveRecord::Base
 
   def preconditions_ok?(old_nodes = [])
     return false if self.nds.empty?
 
   def preconditions_ok?(old_nodes = [])
     return false if self.nds.empty?

-    if self.nds.length > APP_CONFIG['max_number_of_way_nodes']
-      raise OSM::APITooManyWayNodesError.new(self.nds.length, APP_CONFIG['max_number_of_way_nodes'])
+    if self.nds.length > MAX_NUMBER_OF_WAY_NODES
+      raise OSM::APITooManyWayNodesError.new(self.id, self.nds.length, MAX_NUMBER_OF_WAY_NODES)

     end
     end

-    
-    # pre-set all the old nodes to OK, as we must have checked them before.
-    checked = old_nodes.inject(Hash.new) {|h,n| h[n] = true; h }
-
-    self.nds.each do |n|
-      unless checked.key? n
-        node = Node.find(:first, :conditions => ["id = ?", n])
-        unless node and node.visible
-          raise OSM::APIPreconditionFailedError.new("Way #{self.id} requires the node with id #{n}, which either does not exist, or is not visible.")
-        end
-        checked[n] = true
+
+    # check only the new nodes, for efficiency - old nodes having been checked last time and can't
+    # be deleted when they're in-use.
+    new_nds = (self.nds - old_nodes).sort.uniq
+
+    unless new_nds.empty?
+      db_nds = Node.find(:all, :conditions => { :id => new_nds, :visible => true })
+
+      if db_nds.length < new_nds.length
+        missing = new_nds - db_nds.collect { |n| n.id }
+        raise OSM::APIPreconditionFailedError.new("Way #{self.id} requires the nodes with id in (#{missing.join(',')}), which either do not exist, or are not visible.")

       end
     end
       end
     end

+

     return true
   end
 
     return true
   end
 


@@ -262,11 +266,11 @@ class Way < ActiveRecord::Base
     # provide repeatable reads for the used-by checks. this means it
     # shouldn't be possible to get race conditions.
     Way.transaction do
     # provide repeatable reads for the used-by checks. this means it
     # shouldn't be possible to get race conditions.
     Way.transaction do

+      self.lock!

       check_consistency(self, new_way, user)
       check_consistency(self, new_way, user)

-      rel = RelationMember.find(:first, :joins => :relation,
-                             :conditions => [ "visible = ? AND member_type='Way' and member_id=? ", true, self.id])
-      raise OSM::APIPreconditionFailedError.new("Way #{self.id} still used by relation #{rel.relation.id}.") if rel
-      
+      rels = Relation.joins(:relation_members).where(:visible => true, :current_relation_members => { :member_type => "Way", :member_id => id }).order(:id)
+      raise OSM::APIPreconditionFailedError.new("Way #{self.id} is still used by relations #{rels.collect { |r| r.id }.join(",")}.") unless rels.empty?
+

       self.changeset_id = new_way.changeset_id
       self.changeset = new_way.changeset
 
       self.changeset_id = new_way.changeset_id
       self.changeset = new_way.changeset