X-Git-Url: https://git.openstreetmap.org./rails.git/blobdiff_plain/cfbdd3f7e1c688e2c875ded9fd847fcc1c3a4caf..40414cf324309d13d207f9339b7f40ce05a9fa2a:/app/models/relation.rb

diff --git a/app/models/relation.rb b/app/models/relation.rb
index a5d463ffb..bb8f2d003 100644
--- a/app/models/relation.rb
+++ b/app/models/relation.rb
@@ -1,14 +1,17 @@
 class Relation < ActiveRecord::Base
   require 'xml/libxml'
   
-  belongs_to :user
+  set_table_name 'current_relations'
 
-  has_many :relation_members, :foreign_key => 'id'
-  has_many :relation_tags, :foreign_key => 'id'
+  belongs_to :changeset
 
   has_many :old_relations, :foreign_key => 'id', :order => 'version'
 
-  set_table_name 'current_relations'
+  has_many :relation_members, :foreign_key => 'id'
+  has_many :relation_tags, :foreign_key => 'id'
+
+  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
@@ -16,32 +19,38 @@ class Relation < ActiveRecord::Base
       p.string = xml
       doc = p.parse
 
-      relation = Relation.new
-
       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']
+
+    if create
+      relation.timestamp = Time.now
+      relation.visible = true
+    else
+      if pt['timestamp']
+	relation.timestamp = Time.parse(pt['timestamp'])
       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
@@ -58,6 +67,7 @@ class Relation < 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?
     
@@ -102,23 +112,53 @@ class Relation < ActiveRecord::Base
     return el1
   end 
 
+  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
+
+  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
+
+  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
     unless @members
-        @members = Array.new
-        self.relation_members.each do |member|
-            @members += [[member.member_type,member.member_id,member.member_role]]
-        end
+      @members = Array.new
+      self.relation_members.each do |member|
+        @members += [[member.member_type,member.member_id,member.member_role]]
+      end
     end
     @members
   end
 
   def tags
     unless @tags
-        @tags = Hash.new
-        self.relation_tags.each do |tag|
-            @tags[tag.k] = tag.v
-        end
+      @tags = Hash.new
+      self.relation_tags.each do |tag|
+        @tags[tag.k] = tag.v
+      end
     end
     @tags
   end
@@ -144,32 +184,29 @@ class Relation < ActiveRecord::Base
   def save_with_history!
     Relation.transaction do
       t = Time.now
+      self.version += 1
       self.timestamp = t
       self.save!
 
       tags = self.tags
-
       RelationTag.delete_all(['id = ?', self.id])
-
       tags.each do |k,v|
-	tag = RelationTag.new
-	tag.k = k
-	tag.v = v
-	tag.id = self.id
-	tag.save!
+        tag = RelationTag.new
+        tag.k = k
+        tag.v = v
+        tag.id = self.id
+        tag.save!
       end
 
       members = self.members
-
       RelationMember.delete_all(['id = ?', self.id])
-
       members.each do |n|
-	mem = RelationMember.new
-	mem.id = self.id
-	mem.member_type = n[0];
-	mem.member_id = n[1];
-	mem.member_role = n[2];
-	mem.save!
+        mem = RelationMember.new
+        mem.id = self.id
+        mem.member_type = n[0];
+        mem.member_id = n[1];
+        mem.member_role = n[2];
+        mem.save!
       end
 
       old_relation = OldRelation.from_relation(self)
@@ -178,23 +215,80 @@ class Relation < ActiveRecord::Base
     end
   end
 
+  def delete_with_history(user)
+    if self.visible
+      if RelationMember.find(:first, :joins => "INNER JOIN current_relations ON current_relations.id=current_relation_members.id", :conditions => [ "visible = 1 AND member_type='relation' and member_id=?", self.id ])
+	raise OSM::APIPreconditionFailedError.new
+      else
+	self.user_id = user.id
+	self.tags = []
+	self.members = []
+	self.visible = false
+	save_with_history!
+      end
+    else
+      raise OSM::APIAlreadyDeletedError.new
+    end
+  end
+
+  def update_from(new_relation, user)
+    if !new_relation.preconditions_ok?
+      raise OSM::APIPreconditionFailedError.new
+    elsif new_relation.version != version
+      raise OSM::APIVersionMismatchError.new(new_relation.version, version)
+    else
+      self.user_id = user.id
+      self.tags = new_relation.tags
+      self.members = new_relation.members
+      self.visible = true
+      save_with_history!
+    end
+  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.
+    # Once we know the id of the node/way/relation exists
+    # we check to see if it is already existing in the hashtable
+    # if it does, then we return false. Otherwise
+    # we add it to the relevant hash table, with the value true..
+    # 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}
+    nodes = Hash.new
+    ways = Hash.new
+    relations = Hash.new
     self.members.each do |m|
       if (m[0] == "node")
         n = Node.find(:first, :conditions => ["id = ?", m[1]])
         unless n and n.visible 
           return false
         end
+        if nodes[m[1]]
+          return false
+        else
+          nodes[m[1]] = true
+        end
       elsif (m[0] == "way")
         w = Way.find(:first, :conditions => ["id = ?", m[1]])
         unless w and w.visible and w.preconditions_ok?
           return false
         end
+        if ways[m[1]]
+          return false
+        else
+          ways[m[1]] = true
+        end
       elsif (m[0] == "relation")
         e = Relation.find(:first, :conditions => ["id = ?", m[1]])
         unless e and e.visible and e.preconditions_ok?
           return false
         end
+        if relations[m[1]]
+          return false
+        else
+          relations[m[1]] = true
+        end
       else
         return false
       end
@@ -204,4 +298,8 @@ class Relation < ActiveRecord::Base
     return false
   end
 
+  # Temporary method to match interface to nodes
+  def tags_as_hash
+    return self.tags
+  end
 end