DODB::Index(V): #update(String, V) and #delete(String) added.

src/dodb.cr

@@ -50,7 +50,7 @@ class DODB::DataBase(V)
 	##
 	# name is the name that will be used on the file system.
 	def new_index(name : String, &block : Proc(V, String))
-		Index(V).new(@directory_name, name, block).tap do |indexer|
+		Index(V).new(self, @directory_name, name, block).tap do |indexer|
 			@indexers << indexer
 		end
 	end

src/dodb/index.cr

@@ -9,7 +9,9 @@ class DODB::Index(V) < DODB::Indexer(V)
 	property key_proc     : Proc(V, String)
 	getter   storage_root : String
 
-	def initialize(@storage_root, @name, @key_proc)
+	@storage : DODB::DataBase(V)
+
+	def initialize(@storage, @storage_root, @name, @key_proc)
 		Dir.mkdir_p indexing_directory
 	end
 
@@ -66,6 +68,37 @@ class DODB::Index(V) < DODB::Indexer(V)
 		nil
 	end
 
+	def get_key(index : String) : Int32
+		file_path = file_path_index index
+
+		raise MissingEntry.new(@name, index) unless ::File.exists? file_path
+
+		::File.readlink(file_path)
+			.sub(/\.json$/, "")
+			.sub(/^.*\//,   "")
+			.to_i
+	end
+
+	def get_with_key(index : String) : Tuple(V, Int32)
+		key = get_key index
+
+		value = @storage[key]
+
+		{value, key}
+	end
+
+	def update(index : String, new_value : V)
+		_, key = get_with_key index
+
+		@storage[key] = new_value
+	end
+
+	def delete(index : String)
+		key = get_key index
+
+		@storage.delete key
+	end
+
 	def indexing_directory : String
 		"#{@storage_root}/indices/by_#{@name}"
 	end