diff --git a/src/main.lisp b/src/main.lisp
index f1478cb..1ebedae 100644
--- a/src/main.lisp
+++ b/src/main.lisp
@@ -24,6 +24,12 @@
 (defun number->filename (number)
   (format nil "~15,'0D" number))
 
+(defun value->string (value)
+  (typecase value
+            (string value)
+            (symbol (symbol-name value))
+            (t      (format nil "~A" value))))
+
 ; index = 1-1
 ; partition = 1-n
 (defstruct db
@@ -66,19 +72,13 @@
 
 ; Example: returns "./storage/cars/partitions/by_color/Red/".
 (defun db/partition/get-directory-path (dbpath name object-attribute)
-  (let ((value (typecase object-attribute
-                 (string object-attribute)
-                 (symbol (symbol-name object-attribute))
-                 (t      (format nil "~A" object-attribute)))))
-  (concatenate 'string dbpath "/partitions/by_" name "/" value "/")))
+  (let ((value (value->string object-attribute)))
+    (concatenate 'string dbpath "/partitions/by_" name "/" value "/")))
 
 ; Example: "./storage/cars/" "name" #'vehicle-name object -> "./storage/cars/indexes/by_name/Corvet".
 (defun db/index/get-symlink-path (dbpath index-name fsymbol object)
   (let* ((value            (funcall fsymbol object))
-         (symlink-basename (typecase value
-                             (string value)
-                             (symbol (symbol-name value))
-                             (t (format nil "~A" value)))))
+         (symlink-basename (value->string value)))
     (concatenate 'string
       (db/index/get-directory-path dbpath index-name)
       symlink-basename)))
@@ -225,10 +225,7 @@
 
 ; Search for the data from the FS.
 (defun db/get-by-index (database index-name attribute-value)
-  (let ((value (typecase attribute-value
-                 (string attribute-value)
-                 (symbol (symbol-name attribute-value))
-                 (t      (format nil "~A" attribute-value)))))
+  (let ((value (value->string attribute-value)))
     (filename->integer
       (osicat:read-link
         (concatenate 'string
@@ -236,10 +233,7 @@
 
 ; Search for the data from the FS.
 (defun db/get-by-partition (database name attribute-value)
-  (let ((value (typecase attribute-value
-                 (string attribute-value)
-                 (symbol (symbol-name attribute-value))
-                 (t      (format nil "~A" attribute-value))))
+  (let ((value (value->string attribute-value))
         (dbpath (db-path database)))
     (loop for filename in (osicat:list-directory (db/partition/get-directory-path dbpath name value))
           collect (filename->integer filename))))