X-Git-Url: https://git.openstreetmap.org/rails.git/blobdiff_plain/299b6715221fe2e6d31af5f5711656c8f6e40da0..cd4fb9d44cdb46704fee9fc0a95f41978f401b2c:/app/models/relation.rb

diff --git a/app/models/relation.rb b/app/models/relation.rb
index 0bdacb5ec..7be027559 100644
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -27,14 +27,13 @@ class Relation < ActiveRecord::Base
 
   def self.from_xml(xml, create=false)
     begin
-      p = XML::Parser.new
-      p.string = xml
+      p = XML::Parser.string(xml)
       doc = p.parse
 
       doc.find('//osm/relation').each do |pt|
         return Relation.from_xml_node(pt, create)
       end
-    rescue LibXML::XML::Error => ex
+    rescue LibXML::XML::Error, ArgumentError => ex
       raise OSM::APIBadXMLError.new("relation", xml, ex.message)
     end
   end
@@ -49,8 +48,10 @@ class Relation < ActiveRecord::Base
     raise OSM::APIBadXMLError.new("relation", pt, "You are missing the required changeset in the relation") if pt['changeset'].nil?
     relation.changeset_id = pt['changeset']
 
+    # The follow block does not need to be executed because they are dealt with 
+    # in create_with_history, update_from and delete_with_history
     if create
-      relation.timestamp = Time.now
+      relation.timestamp = Time.now.getutc
       relation.visible = true
       relation.version = 0
     else
@@ -73,7 +74,7 @@ class Relation < ActiveRecord::Base
       #member_role
       member['role'] ||= "" # Allow  the upload to not include this, in which case we default to an empty string.
       logger.debug member['role']
-      relation.add_member(member['type'], member['ref'], member['role'])
+      relation.add_member(member['type'].classify, member['ref'], member['role'])
     end
     raise OSM::APIBadUserInput.new("Some bad xml in relation") if relation.nil?
 
@@ -86,7 +87,7 @@ class Relation < ActiveRecord::Base
     return doc
   end
 
-  def to_xml_node(user_display_name_cache = nil)
+  def to_xml_node(changeset_cache = {}, user_display_name_cache = {})
     el1 = XML::Node.new 'relation'
     el1['id'] = self.id.to_s
     el1['visible'] = self.visible.to_s
@@ -94,19 +95,25 @@ class Relation < ActiveRecord::Base
     el1['version'] = self.version.to_s
     el1['changeset'] = self.changeset_id.to_s
 
-    user_display_name_cache = {} if user_display_name_cache.nil?
-    
-    if user_display_name_cache and user_display_name_cache.key?(self.changeset.user_id)
+    if changeset_cache.key?(self.changeset_id)
+      # use the cache if available
+    else
+      changeset_cache[self.changeset_id] = self.changeset.user_id
+    end
+
+    user_id = changeset_cache[self.changeset_id]
+
+    if user_display_name_cache.key?(user_id)
       # use the cache if available
     elsif self.changeset.user.data_public?
-      user_display_name_cache[self.changeset.user_id] = self.changeset.user.display_name
+      user_display_name_cache[user_id] = self.changeset.user.display_name
     else
-      user_display_name_cache[self.changeset.user_id] = nil
+      user_display_name_cache[user_id] = nil
     end
 
-    if not user_display_name_cache[self.changeset.user_id].nil?
-      el1['user'] = user_display_name_cache[self.changeset.user_id]
-      el1['uid'] = self.changeset.user_id.to_s
+    if not user_display_name_cache[user_id].nil?
+      el1['user'] = user_display_name_cache[user_id]
+      el1['uid'] = user_id.to_s
     end
 
     self.relation_members.each do |member|
@@ -124,7 +131,7 @@ class Relation < ActiveRecord::Base
       #end
       if p
         e = XML::Node.new 'member'
-        e['type'] = member.member_type
+        e['type'] = member.member_type.downcase
         e['ref'] = member.member_id.to_s 
         e['role'] = member.member_role
         el1 << e
@@ -144,7 +151,7 @@ class Relation < ActiveRecord::Base
     if ids.empty?
       return []
     else
-      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'node' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members AS crm ON crm.id = current_relations.id", :conditions => "crm.member_type = 'Node' AND crm.member_id IN (#{ids.join(',')})" }) do
         return self.find(:all, options)
       end
     end
@@ -154,7 +161,7 @@ class Relation < ActiveRecord::Base
     if ids.empty?
       return []
     else
-      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'way' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members AS crm ON crm.id = current_relations.id", :conditions => "crm.member_type = 'Way' AND crm.member_id IN (#{ids.join(',')})" }) do
         return self.find(:all, options)
       end
     end
@@ -164,7 +171,7 @@ class Relation < ActiveRecord::Base
     if ids.empty?
       return []
     else
-      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members ON current_relation_members.id = current_relations.id", :conditions => "current_relation_members.member_type = 'relation' AND current_relation_members.member_id IN (#{ids.join(',')})" }) do
+      self.with_scope(:find => { :joins => "INNER JOIN current_relation_members AS crm ON crm.id = current_relations.id", :conditions => "crm.member_type = 'Relation' AND crm.member_id IN (#{ids.join(',')})" }) do
         return self.find(:all, options)
       end
     end
@@ -209,23 +216,140 @@ class Relation < ActiveRecord::Base
 
     # duplicate tags are now forbidden, so we can't allow values
     # in the hash to be overwritten.
-    raise OSM::APIDuplicateTagsError.new if @tags.include? k
+    raise OSM::APIDuplicateTagsError.new("relation", self.id, k) if @tags.include? k
 
     @tags[k] = v
   end
 
+  ##
+  # updates the changeset bounding box to contain the bounding box of 
+  # the element with given +type+ and +id+. this only works with nodes
+  # and ways at the moment, as they're the only elements to respond to
+  # the :bbox call.
+  def update_changeset_element(type, id)
+    element = Kernel.const_get(type.capitalize).find(id)
+    changeset.update_bbox! element.bbox
+  end    
+
+  def delete_with_history!(new_relation, user)
+    unless self.visible
+      raise OSM::APIAlreadyDeletedError.new("relation", new_relation.id)
+    end
+
+    # need to start the transaction here, so that the database can 
+    # provide repeatable reads for the used-by checks. this means it
+    # shouldn't be possible to get race conditions.
+    Relation.transaction do
+      check_consistency(self, new_relation, user)
+      # This will check to see if this relation is used by another relation
+      rel = RelationMember.find(:first, :joins => :relation, 
+                                :conditions => [ "visible = ? AND member_type='Relation' and member_id=? ", true, self.id ])
+      raise OSM::APIPreconditionFailedError.new("The relation #{new_relation.id} is used in relation #{rel.relation.id}.") unless rel.nil?
+
+      self.changeset_id = new_relation.changeset_id
+      self.tags = {}
+      self.members = []
+      self.visible = false
+      save_with_history!
+    end
+  end
+
+  def update_from(new_relation, user)
+    check_consistency(self, new_relation, user)
+    unless new_relation.preconditions_ok?(self.members)
+      raise OSM::APIPreconditionFailedError.new("Cannot update relation #{self.id}: data or member data is invalid.")
+    end
+    self.changeset_id = new_relation.changeset_id
+    self.changeset = new_relation.changeset
+    self.tags = new_relation.tags
+    self.members = new_relation.members
+    self.visible = true
+    save_with_history!
+  end
+  
+  def create_with_history(user)
+    check_create_consistency(self, user)
+    unless self.preconditions_ok?
+      raise OSM::APIPreconditionFailedError.new("Cannot create relation: data or member data is invalid.")
+    end
+    self.version = 0
+    self.visible = true
+    save_with_history!
+  end
+
+  def preconditions_ok?(good_members = [])
+    # These are hastables that store an id in the index of all 
+    # the nodes/way/relations that have already been added.
+    # If the member is valid and visible then we add it to the 
+    # relevant hash table, with the value true as a cache.
+    # Thus if you have nodes with the ids of 50 and 1 already in the
+    # relation, then the hash table nodes would contain:
+    # => {50=>true, 1=>true}
+    elements = { :node => Hash.new, :way => Hash.new, :relation => Hash.new }
+
+    # pre-set all existing members to good
+    good_members.each { |m| elements[m[0].downcase.to_sym][m[1]] = true }
+
+    self.members.each do |m|
+      # find the hash for the element type or die
+      hash = elements[m[0].downcase.to_sym] or return false
+      # unless its in the cache already
+      unless hash.key? m[1]
+        # use reflection to look up the appropriate class
+        model = Kernel.const_get(m[0].capitalize)
+        # get the element with that ID
+        element = model.find(:first, :conditions =>["id = ?", m[1]])
+
+        # and check that it is OK to use.
+        unless element and element.visible? and element.preconditions_ok?
+          raise OSM::APIPreconditionFailedError.new("Relation with id #{self.id} cannot be saved due to #{m[0]} with id #{element.id}")
+          return false
+        end
+        hash[m[1]] = true
+      end
+    end
+
+    return true
+  rescue
+    return false
+  end
+
+  # Temporary method to match interface to nodes
+  def tags_as_hash
+    return self.tags
+  end
+
+  ##
+  # if any members are referenced by placeholder IDs (i.e: negative) then
+  # this calling this method will fix them using the map from placeholders 
+  # to IDs +id_map+. 
+  def fix_placeholders!(id_map, placeholder_id = nil)
+    self.members.map! do |type, id, role|
+      old_id = id.to_i
+      if old_id < 0
+        new_id = id_map[type.downcase.to_sym][old_id]
+        raise OSM::APIBadUserInput.new("Placeholder #{type} not found for reference #{old_id} in relation #{self.id.nil? ? placeholder_id : self.id}.") if new_id.nil?
+        [type, new_id, role]
+      else
+        [type, id, role]
+      end
+    end
+  end
+
+  private
+  
   def save_with_history!
     Relation.transaction do
       # have to be a little bit clever here - to detect if any tags
       # changed then we have to monitor their before and after state.
       tags_changed = false
 
-      t = Time.now
+      t = Time.now.getutc
       self.version += 1
       self.timestamp = t
       self.save!
 
-      tags = self.tags
+      tags = self.tags.clone
       self.relation_tags.each do |old_tag|
         key = old_tag.k
         # if we can match the tags we currently have to the list
@@ -233,11 +357,7 @@ class Relation < ActiveRecord::Base
         # if any are different then set the flag and do the DB 
         # update.
         if tags.has_key? key 
-          # rails 2.1 dirty handling should take care of making this
-          # somewhat efficient... hopefully...
-          old_tag.v = tags[key]
-          tags_changed |= old_tag.changed?
-          old_tag.save!
+          tags_changed |= (old_tag.v != tags[key])
 
           # remove from the map, so that we can expect an empty map
           # at the end if there are no new tags
@@ -246,20 +366,20 @@ class Relation < ActiveRecord::Base
         else
           # this means a tag was deleted
           tags_changed = true
-          RelationTag.delete_all ['id = ? and k = ?', self.id, old_tag.k]
         end
       end
       # if there are left-over tags then they are new and will have to
       # be added.
       tags_changed |= (not tags.empty?)
-      tags.each do |k,v|
+      RelationTag.delete_all(:id => self.id)
+      self.tags.each do |k,v|
         tag = RelationTag.new
         tag.k = k
         tag.v = v
         tag.id = self.id
         tag.save!
       end
-
+      
       # same pattern as before, but this time we're collecting the
       # changed members in an array, as the bounding box updates for
       # elements are per-element, not blanked on/off like for tags.
@@ -317,14 +437,16 @@ class Relation < ActiveRecord::Base
         # FIXME: check for tag changes along with element deletions and
         # make sure that the deleted element's bounding box is hit.
         self.members.each do |type, id, role|
-          if type != "relation"
+          if type != "Relation"
             update_changeset_element(type, id)
           end
         end
       else
         # add only changed members to the changeset
         changed_members.each do |id, type|
-          update_changeset_element(type, id)
+          if type != "Relation"
+            update_changeset_element(type, id)
+          end
         end
       end
 
@@ -336,114 +458,4 @@ class Relation < ActiveRecord::Base
     end
   end
 
-  ##
-  # updates the changeset bounding box to contain the bounding box of 
-  # the element with given +type+ and +id+. this only works with nodes
-  # and ways at the moment, as they're the only elements to respond to
-  # the :bbox call.
-  def update_changeset_element(type, id)
-    element = Kernel.const_get(type.capitalize).find(id)
-    changeset.update_bbox! element.bbox
-  end    
-
-  def delete_with_history!(new_relation, user)
-    unless self.visible
-      raise OSM::APIAlreadyDeletedError.new
-    end
-
-    # need to start the transaction here, so that the database can 
-    # provide repeatable reads for the used-by checks. this means it
-    # shouldn't be possible to get race conditions.
-    Relation.transaction do
-      check_consistency(self, new_relation, user)
-      # This will check to see if this relation is used by another relation
-      if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = ? AND member_type='relation' and member_id=? ", true, self.id ])
-        raise OSM::APIPreconditionFailedError.new("The relation #{new_relation.id} is a used in another relation")
-      end
-      self.changeset_id = new_relation.changeset_id
-      self.tags = {}
-      self.members = []
-      self.visible = false
-      save_with_history!
-    end
-  end
-
-  def update_from(new_relation, user)
-    check_consistency(self, new_relation, user)
-    if !new_relation.preconditions_ok?
-      raise OSM::APIPreconditionFailedError.new
-    end
-    self.changeset_id = new_relation.changeset_id
-    self.tags = new_relation.tags
-    self.members = new_relation.members
-    self.visible = true
-    save_with_history!
-  end
-  
-  def create_with_history(user)
-    check_create_consistency(self, user)
-    if !self.preconditions_ok?
-      raise OSM::APIPreconditionFailedError.new
-    end
-    self.version = 0
-    self.visible = true
-    save_with_history!
-  end
-
-  def preconditions_ok?
-    # These are hastables that store an id in the index of all 
-    # the nodes/way/relations that have already been added.
-    # If the member is valid and visible then we add it to the 
-    # relevant hash table, with the value true as a cache.
-    # Thus if you have nodes with the ids of 50 and 1 already in the
-    # relation, then the hash table nodes would contain:
-    # => {50=>true, 1=>true}
-    elements = { :node => Hash.new, :way => Hash.new, :relation => Hash.new }
-    self.members.each do |m|
-      # find the hash for the element type or die
-      hash = elements[m[0].to_sym] or return false
-
-      # unless its in the cache already
-      unless hash.key? m[1]
-        # use reflection to look up the appropriate class
-        model = Kernel.const_get(m[0].capitalize)
-
-        # get the element with that ID
-        element = model.find(m[1])
-
-        # and check that it is OK to use.
-        unless element and element.visible? and element.preconditions_ok?
-          return false
-        end
-        hash[m[1]] = true
-      end
-    end
-
-    return true
-  rescue
-    return false
-  end
-
-  # Temporary method to match interface to nodes
-  def tags_as_hash
-    return self.tags
-  end
-
-  ##
-  # if any members are referenced by placeholder IDs (i.e: negative) then
-  # this calling this method will fix them using the map from placeholders 
-  # to IDs +id_map+. 
-  def fix_placeholders!(id_map)
-    self.members.map! do |type, id, role|
-      old_id = id.to_i
-      if old_id < 0
-        new_id = id_map[type.to_sym][old_id]
-        raise "invalid placeholder" if new_id.nil?
-        [type, new_id, role]
-      else
-        [type, id, role]
-      end
-    end
-  end
-
 end