Enable "get?" functions for partitions and tags.

src/dodb/partition.cr

@@ -39,7 +39,7 @@ class DODB::Partition(V) < DODB::Indexer(V)
 		::File.delete symlink
 	end
 
-	def get(partition)
+	def get(partition) : Array(V)
 		r_value = Array(V).new
 
 		partition_directory = indexing_directory partition
@@ -53,6 +53,12 @@ class DODB::Partition(V) < DODB::Indexer(V)
 		r_value
 	end
 
+	def get?(partition) : Array(V)?
+		get partition
+	rescue MissingEntry
+		nil
+	end
+
 	def delete(partition)
 		delete partition, do true end
 	end

src/dodb/tags.cr

@@ -64,6 +64,12 @@ class DODB::Tags(V) < DODB::Indexer(V)
 		get_with_indice(tag).map &.[0]
 	end
 
+	def get?(tag : String) : Array(V)?
+		get tag
+	rescue MissingEntry
+		nil
+	end
+
 	def get(keys : Array(String)) : Array(V)
 		get_with_indices(keys.sort).map &.[0]
 	end
@@ -140,7 +146,17 @@ class DODB::CachedTags(V) < DODB::Tags(V)
 		end
 	end
 
-	def get(tag : String)
+	def get_with_indice(tag : String) : Array(Tuple(V, Int32))
+		r_value = Array(Tuple(V, Int32)).new
+
+		@data[tag].each do |data_key|
+			r_value << { @storage[data_key], data_key }
+		end
+
+		r_value
+	end
+
+	def get(tag : String) : Array(V)
 		r_value = Array(V).new
 
 		@data[tag].each do |data_key|