api06: simplify exception handling and add exception handling to the diff

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

diff --git a/app/models/way.rb b/app/models/way.rb
index 2c9ce9f72d06e0560632953a1fafd9b069ff26b6..ea027fb47908d2148ae7d07476843972aeeebd86 100644 (file)
--- a/app/models/way.rb
+++ b/app/models/way.rb
@@ -3,6 +3,7 @@ class Way < ActiveRecord::Base
 
   belongs_to :user
 
+  has_many :nodes, :through => :way_nodes, :order => 'sequence_id'
   has_many :way_nodes, :foreign_key => 'id', :order => 'sequence_id'
   has_many :way_tags, :foreign_key => 'id'
 
@@ -16,32 +17,38 @@ class Way < ActiveRecord::Base
       p.string = xml
       doc = p.parse
 
-      way = Way.new
-
       doc.find('//osm/way').each do |pt|
-        if !create and pt['id'] != '0'
-          way.id = pt['id'].to_i
-        end
+       return Way.from_xml_node(pt, create)
+      end
+    rescue
+      return nil
+    end
+  end
 
-        if create
-          way.timestamp = Time.now
-          way.visible = true
-        else
-          if pt['timestamp']
-            way.timestamp = Time.parse(pt['timestamp'])
-          end
-        end
+  def self.from_xml_node(pt, create=false)
+    way = Way.new
 
-        pt.find('tag').each do |tag|
-          way.add_tag_keyval(tag['k'], tag['v'])
-        end
+    if !create and pt['id'] != '0'
+      way.id = pt['id'].to_i
+    end
+    
+    way.version = pt['version']
 
-        pt.find('nd').each do |nd|
-          way.add_nd_num(nd['ref'])
-        end
+    if create
+      way.timestamp = Time.now
+      way.visible = true
+    else
+      if pt['timestamp']
+       way.timestamp = Time.parse(pt['timestamp'])
       end
-    rescue
-      way = nil
+    end
+
+    pt.find('tag').each do |tag|
+      way.add_tag_keyval(tag['k'], tag['v'])
+    end
+
+    pt.find('nd').each do |nd|
+      way.add_nd_num(nd['ref'])
     end
 
     return way
@@ -52,7 +59,9 @@ class Way < ActiveRecord::Base
   
   # You can't pull in all the tags too unless we put a sequence_id on the way_tags table and have a multipart key
   def self.find_eager(id)
-    way = Way.find(id, :include => [:way_tags, {:way_nodes => :node}])
+    way = Way.find(id, :include => {:way_nodes => :node})
+    #If waytag had a multipart key that was real, you could do this:
+    #way = Way.find(id, :include => [:way_tags, {:way_nodes => :node}])
   end
 
   # Find a way given it's ID, and in a single SQL call also grab its nodes and tags
@@ -67,6 +76,7 @@ class Way < ActiveRecord::Base
     el1['id'] = self.id.to_s
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema
+    el1['version'] = self.version.to_s
 
     user_display_name_cache = {} if user_display_name_cache.nil?
 
@@ -155,15 +165,12 @@ class Way < ActiveRecord::Base
     t = Time.now
 
     Way.transaction do
+      self.version += 1
       self.timestamp = t
       self.save!
-    end
 
-    WayTag.transaction do
       tags = self.tags
-
       WayTag.delete_all(['id = ?', self.id])
-
       tags.each do |k,v|
         tag = WayTag.new
         tag.k = k
@@ -171,13 +178,9 @@ class Way < ActiveRecord::Base
         tag.id = self.id
         tag.save!
       end
-    end
 
-    WayNode.transaction do
       nds = self.nds
-
       WayNode.delete_all(['id = ?', self.id])
-
       sequence = 1
       nds.each do |n|
         nd = WayNode.new
@@ -186,11 +189,25 @@ class Way < ActiveRecord::Base
         nd.save!
         sequence += 1
       end
+
+      old_way = OldWay.from_way(self)
+      old_way.timestamp = t
+      old_way.save_with_dependencies!
     end
+  end
 
-    old_way = OldWay.from_way(self)
-    old_way.timestamp = t
-    old_way.save_with_dependencies!
+  def update_from(new_way, user)
+    if !new_way.preconditions_ok?
+      raise OSM::APIPreconditionFailedError.new
+    elsif new_way.version != version
+      raise OSM::APIVersionMismatchError.new(new_way.version, version)
+    else
+      self.user_id = user.id
+      self.tags = new_way.tags
+      self.nds = new_way.nds
+      self.visible = true
+      save_with_history!
+    end
   end
 
   def preconditions_ok?
@@ -204,4 +221,53 @@ class Way < ActiveRecord::Base
     return true
   end
 
+  def delete_with_history(user)
+    if self.visible
+         # FIXME
+         # this should actually delete the relations,
+         # not just throw a PreconditionFailed if it's a member of a relation!!
+
+      # FIXME: this should probably renamed to delete_with_history
+      if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id",
+                             :conditions => [ "visible = 1 AND member_type='way' and member_id=?", self.id])
+        raise OSM::APIPreconditionFailedError
+      # end FIXME
+      else
+        self.user_id = user.id
+        self.tags = []
+        self.nds = []
+        self.visible = false
+        self.save_with_history!
+      end
+    else
+      raise OSM::APIAlreadyDeletedError
+    end
+  end
+
+  # delete a way and it's nodes that aren't part of other ways, with history
+
+  # FIXME: merge the potlatch code to delete the relations
+  def delete_with_relations_and_nodes_and_history(user)
+    
+    node_ids = self.nodes.collect {|node| node.id }
+    node_ids_not_to_delete = []
+    way_nodes = WayNode.find(:all, :conditions => "node_id in (#{node_ids.join(',')}) and id != #{self.id}")
+    
+    node_ids_not_to_delete = way_nodes.collect {|way_node| way_node.node_id}
+
+    node_ids_to_delete = node_ids - node_ids_not_to_delete
+
+    # delete the nodes not used by other ways
+    node_ids_to_delete.each do |node_id|
+      n = Node.find(node_id)
+      n.user_id = user.id
+      n.visible = false
+      n.save_with_history!
+    end
+    
+    self.user_id = user.id
+
+    self.delete_with_history(user)
+
+  end
 end