Handle deleted items better.

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

diff --git a/app/models/way.rb b/app/models/way.rb
index b564a3317b5bffffa0c9549960cd8af564b53ef9..f1dc76eb4c6b65053214e1e80f6665f70ad10052 100644 (file)
--- a/app/models/way.rb
+++ b/app/models/way.rb
@@ -1,8 +1,9 @@
 class Way < ActiveRecord::Base
   require 'xml/libxml'
-  
+
   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'
 
@@ -47,6 +48,17 @@ class Way < ActiveRecord::Base
     return way
   end
 
+  # Find a way given it's ID, and in a single SQL call also grab its nodes
+  #
+  
+  # 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_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
   def to_xml
     doc = OSM::API.new.get_xml_doc
     doc.root << to_xml_node()
@@ -60,7 +72,7 @@ class Way < ActiveRecord::Base
     el1['timestamp'] = self.timestamp.xmlschema
 
     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?
@@ -94,7 +106,7 @@ class Way < ActiveRecord::Base
         el1 << e
       end
     end
- 
+
     self.way_tags.each do |tag|
       e = XML::Node.new 'tag'
       e['k'] = tag.k
@@ -106,20 +118,20 @@ class Way < ActiveRecord::Base
 
   def nds
     unless @nds
-        @nds = Array.new
-        self.way_nodes.each do |nd|
-            @nds += [nd.node_id]
-        end
+      @nds = Array.new
+      self.way_nodes.each do |nd|
+        @nds += [nd.node_id]
+      end
     end
     @nds
   end
 
   def tags
     unless @tags
-        @tags = Hash.new
-        self.way_tags.each do |tag|
-            @tags[tag.k] = tag.v
-        end
+      @tags = {}
+      self.way_tags.each do |tag|
+        @tags[tag.k] = tag.v
+      end
     end
     @tags
   end
@@ -142,49 +154,46 @@ class Way < ActiveRecord::Base
     @tags[k] = v
   end
 
-  def save_with_history
-    begin
-      Way.transaction do
-        t = Time.now
-        self.timestamp = t
-        self.save!
+  def save_with_history!
+    t = Time.now
 
-        tags = self.tags
+    Way.transaction do
+      self.timestamp = t
+      self.save!
+    end
 
-        WayTag.delete_all(['id = ?', self.id])
+    WayTag.transaction do
+      tags = self.tags
 
-        tags.each do |k,v|
-          tag = WayTag.new
-          tag.k = k
-          tag.v = v
-          tag.id = self.id
-          tag.save!
-        end
+      WayTag.delete_all(['id = ?', self.id])
 
-        nds = self.nds
+      tags.each do |k,v|
+        tag = WayTag.new
+        tag.k = k
+        tag.v = v
+        tag.id = self.id
+        tag.save!
+      end
+    end
 
-        WayNode.delete_all(['id = ?', self.id])
+    WayNode.transaction do
+      nds = self.nds
 
-        i = 1
-        nds.each do |n|
-          nd = WayNode.new
-          nd.id = self.id
-          nd.node_id = n
-          nd.sequence_id = i
-          nd.save!
-          i += 1
-        end
+      WayNode.delete_all(['id = ?', self.id])
 
-        old_way = OldWay.from_way(self)
-        old_way.timestamp = t
-        old_way.save_with_dependencies!
+      sequence = 1
+      nds.each do |n|
+        nd = WayNode.new
+        nd.id = [self.id, sequence]
+        nd.node_id = n
+        nd.save!
+        sequence += 1
       end
-
-      return true
-    rescue => ex
-      puts ex
-      return nil
     end
+
+    old_way = OldWay.from_way(self)
+    old_way.timestamp = t
+    old_way.save_with_dependencies!
   end
 
   def preconditions_ok?
@@ -198,4 +207,50 @@ class Way < ActiveRecord::Base
     return true
   end
 
+  # Delete the way and it's relations, but don't really delete it - set its visibility to false and update the history etc to maintain wiki-like functionality.
+  def delete_with_relations_and_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!!
+      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
+  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_relations_and_history(user)
+
+  end
 end