Added a query method for querying bounding boxes, times and users of changesets....

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

diff --git a/app/models/relation.rb b/app/models/relation.rb
index cd2d67cdde0b969020d88530fdc82748f6f19451..be990e589a2135b0c88b714927ce6824bd29d8cb 100644 (file)
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -1,17 +1,19 @@
 class Relation < ActiveRecord::Base
   require 'xml/libxml'
   
 class Relation < ActiveRecord::Base
   require 'xml/libxml'
   

+  include ConsistencyValidations
+  

   set_table_name 'current_relations'
 
   set_table_name 'current_relations'
 

-  belongs_to :user
+  belongs_to :changeset

 
   has_many :old_relations, :foreign_key => 'id', :order => 'version'
 
   has_many :relation_members, :foreign_key => 'id'
   has_many :relation_tags, :foreign_key => 'id'
 
 
   has_many :old_relations, :foreign_key => 'id', :order => 'version'
 
   has_many :relation_members, :foreign_key => 'id'
   has_many :relation_tags, :foreign_key => 'id'
 

-  has_many :containing_relation_members, :as => :member
-  has_many :containing_relations, :through => :containing_relation_members
+  has_many :containing_relation_members, :class_name => "RelationMember", :as => :member
+  has_many :containing_relations, :class_name => "Relation", :through => :containing_relation_members, :source => :relation, :extend => ObjectFinder

 
   def self.from_xml(xml, create=false)
     begin
 
   def self.from_xml(xml, create=false)
     begin


@@ -19,32 +21,39 @@ class Relation < ActiveRecord::Base
       p.string = xml
       doc = p.parse
 
       p.string = xml
       doc = p.parse
 

-      relation = Relation.new
-

       doc.find('//osm/relation').each do |pt|
       doc.find('//osm/relation').each do |pt|

-        if !create and pt['id'] != '0'
-          relation.id = pt['id'].to_i
-        end
+       return Relation.from_xml_node(pt, create)
+      end
+    rescue
+      return nil
+    end
+  end

 
 

-        if create
-          relation.timestamp = Time.now
-          relation.visible = true
-        else
-          if pt['timestamp']
-            relation.timestamp = Time.parse(pt['timestamp'])
-          end
-        end
+  def self.from_xml_node(pt, create=false)
+    relation = Relation.new

 
 

-        pt.find('tag').each do |tag|
-          relation.add_tag_keyval(tag['k'], tag['v'])
-        end
+    if !create and pt['id'] != '0'
+      relation.id = pt['id'].to_i
+    end

 
 

-        pt.find('member').each do |member|
-          relation.add_member(member['type'], member['ref'], member['role'])
-        end
+    relation.version = pt['version']
+    relation.changeset_id = pt['changeset']
+
+    if create
+      relation.timestamp = Time.now
+      relation.visible = true
+    else
+      if pt['timestamp']
+        relation.timestamp = Time.parse(pt['timestamp'])

       end
       end

-    rescue
-      relation = nil
+    end
+
+    pt.find('tag').each do |tag|
+      relation.add_tag_keyval(tag['k'], tag['v'])
+    end
+
+    pt.find('member').each do |member|
+      relation.add_member(member['type'], member['ref'], member['role'])

     end
 
     return relation
     end
 
     return relation


@@ -61,18 +70,20 @@ class Relation < ActiveRecord::Base
     el1['id'] = self.id.to_s
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema
     el1['id'] = self.id.to_s
     el1['visible'] = self.visible.to_s
     el1['timestamp'] = self.timestamp.xmlschema

+    el1['version'] = self.version.to_s
+    el1['changeset'] = self.changeset_id.to_s

 
     user_display_name_cache = {} if user_display_name_cache.nil?
     
 
     user_display_name_cache = {} if user_display_name_cache.nil?
     

-    if user_display_name_cache and user_display_name_cache.key?(self.user_id)
+    if user_display_name_cache and user_display_name_cache.key?(self.changeset.user_id)

       # use the cache if available
       # use the cache if available

-    elsif self.user.data_public?
-      user_display_name_cache[self.user_id] = self.user.display_name
+    elsif self.changeset.user.data_public?
+      user_display_name_cache[self.changeset.user_id] = self.changeset.user.display_name

     else
     else

-      user_display_name_cache[self.user_id] = nil
+      user_display_name_cache[self.changeset.user_id] = nil

     end
 
     end
 

-    el1['user'] = user_display_name_cache[self.user_id] unless user_display_name_cache[self.user_id].nil?
+    el1['user'] = user_display_name_cache[self.changeset.user_id] unless user_display_name_cache[self.changeset.user_id].nil?

 
     self.relation_members.each do |member|
       p=0
 
     self.relation_members.each do |member|
       p=0


@@ -105,28 +116,35 @@ class Relation < ActiveRecord::Base
     return el1
   end 
 
     return el1
   end 
 

-    
-  # collect relationships. currently done in one big block at the end;
-  # may need to move this upwards if people want automatic completion of
-  # relationships, i.e. deliver referenced objects like we do with ways... 
-  # FIXME: rip out the fucking SQL
-  def self.find_for_nodes_and_ways(node_ids, way_ids)
-    relations = []
-
-    if node_ids.length > 0
-      relations += Relation.find_by_sql("select e.* from current_relations e,current_relation_members em where " +
-            "e.visible=1 and " +
-            "em.id = e.id and em.member_type='node' and em.member_id in (#{node_ids.join(',')})")
-    end
-    if way_ids.length > 0
-      relations += Relation.find_by_sql("select e.* from current_relations e,current_relation_members em where " +
-            "e.visible=1 and " +
-            "em.id = e.id and em.member_type='way' and em.member_id in (#{way_ids.join(',')})")
+  def self.find_for_nodes(ids, options = {})
+    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
+        return self.find(:all, options)
+      end

     end
     end

+  end

 
 

-    relations # if you don't do this then it returns nil and not []
+  def self.find_for_ways(ids, options = {})
+    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
+        return self.find(:all, options)
+      end
+    end

   end
 
   end
 

+  def self.find_for_relations(ids, options = {})
+    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
+        return self.find(:all, options)
+      end
+    end
+  end

 
   # FIXME is this really needed?
   def members
 
   # FIXME is this really needed?
   def members


@@ -164,19 +182,52 @@ class Relation < ActiveRecord::Base
 
   def add_tag_keyval(k, v)
     @tags = Hash.new unless @tags
 
   def add_tag_keyval(k, v)
     @tags = Hash.new unless @tags

+
+    # 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
+

     @tags[k] = v
   end
 
   def save_with_history!
     Relation.transaction do
     @tags[k] = v
   end
 
   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

+      self.version += 1

       self.timestamp = t
       self.save!
 
       tags = self.tags
       self.timestamp = t
       self.save!
 
       tags = self.tags

+      self.relation_tags.each do |old_tag|
+        key = old_tag.k
+        # if we can match the tags we currently have to the list
+        # of old tags, then we never set the tags_changed flag. but
+        # 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!
+
+          # remove from the map, so that we can expect an empty map
+          # at the end if there are no new tags
+          tags.delete key

 
 

-      RelationTag.delete_all(['id = ?', self.id])
-
+        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|
         tag = RelationTag.new
         tag.k = k
       tags.each do |k,v|
         tag = RelationTag.new
         tag.k = k


@@ -185,25 +236,128 @@ class Relation < ActiveRecord::Base
         tag.save!
       end
 
         tag.save!
       end
 

-      members = self.members
-
-      RelationMember.delete_all(['id = ?', self.id])
+      # 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.
+      changed_members = Array.new
+      members = self.members_as_hash
+      relation_members.each do |old_member|
+        key = [old_member.member_id.to_s, old_member.member_type]
+        if members.has_key? key
+          # i'd love to rely on rails' dirty handling here, but the 
+          # relation members are always dirty because of the member_class
+          # handling.
+          if members[key] != old_member.member_role
+            old_member.member_role = members[key]
+            changed_members << key
+            old_member.save!
+          end
+          members.delete key

 
 

-      members.each do |n|
+        else
+          changed_members << key
+          RelationMember.delete_all ['id = ? and member_id = ? and member_type = ?', self.id, old_member.member_id, old_member.member_type]
+        end
+      end
+      # any remaining members must be new additions
+      changed_members += members.keys
+      members.each do |k,v|

         mem = RelationMember.new
         mem.id = self.id
         mem = RelationMember.new
         mem.id = self.id

-        mem.member_type = n[0];
-        mem.member_id = n[1];
-        mem.member_role = n[2];
+        mem.member_type = k[1];
+        mem.member_id = k[0];
+        mem.member_role = v;

         mem.save!
       end
 
       old_relation = OldRelation.from_relation(self)
       old_relation.timestamp = t
       old_relation.save_with_dependencies!
         mem.save!
       end
 
       old_relation = OldRelation.from_relation(self)
       old_relation.timestamp = t
       old_relation.save_with_dependencies!

+
+      # update the bbox of the changeset and save it too.
+      # discussion on the mailing list gave the following definition for
+      # the bounding box update procedure of a relation:
+      #
+      # adding or removing nodes or ways from a relation causes them to be
+      # added to the changeset bounding box. adding a relation member or
+      # changing tag values causes all node and way members to be added to the
+      # bounding box. this is similar to how the map call does things and is
+      # reasonable on the assumption that adding or removing members doesn't
+      # materially change the rest of the relation.
+      any_relations = 
+        changed_members.collect { |id,type| type == "relation" }.
+        inject(false) { |b,s| b or s }
+
+      if tags_changed or any_relations
+        # add all non-relation bounding boxes to the changeset
+        # 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"
+            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)
+        end
+      end
+
+      # save the (maybe updated) changeset bounding box
+      changeset.save!
+    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)
+    if self.visible
+      check_consistency(self, new_relation, user)
+      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
+      else
+        self.changeset_id = new_relation.changeset_id
+        self.tags = {}
+        self.members = []
+        self.visible = false
+        save_with_history!
+      end
+    else
+      raise OSM::APIAlreadyDeletedError.new

     end
   end
 
     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.
   def preconditions_ok?
     # These are hastables that store an id in the index of all 
     # the nodes/way/relations that have already been added.


@@ -257,4 +411,37 @@ class Relation < ActiveRecord::Base
     return false
   end
 
     return false
   end
 

+  ##
+  # members in a hash table [id,type] => role
+  def members_as_hash
+    h = Hash.new
+    members.each do |m|
+      # should be: h[[m.id, m.type]] = m.role, but someone prefers arrays
+      h[[m[1], m[0]]] = m[2]
+    end
+    return h
+  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
 end