filofacts

File-based document store for Clojure

Overview

For small, throw-away projects or prototypes (such as reading-list), the ceremony of setting up a database to persist state is often disproportionate. In-memory databases, on the other hand, are too fragile and fleeting, suitable only for testing environments. Enter filofacts, a file-based document store.

Installation

Add the following dependency to your project.clj file:

[filofacts "0.1.0"]

Usage

(ns test
  (:require filofacts.core :as ff))

; open database
(def db (ff/open "/tmp/friends"))

; save document
; stored in /tmp/friends/1/1
(def alice
  (ff/insert! db {:name "Alice"
                  :age 31
                  :interests #{:travel :friends :beauty}}))

; save document
; stored in /tmp/friends/2/1
(def bob
  (ff/insert! db {:name "Bob"
                  :age 29
                  :interests #{:technology :football :cars}})) 

; document id and revision stored in metadata
(println (meta alice)) ; => {:id 1 :rev 1}
(println (meta bob))   ; => {:id 2 :rev 1}

; update document
; stored in /tmp/friends/2/2
(def bob2
  (ff/update! db (:id (meta bob)) {:name "Bob"
                                   :age 23
                                   :interests #{:technology :football :music}}))

(println (meta bob2))   ; => {:id 2 :rev 2}

; retrieve latest rev of a document
(def res (ff/find db (:id (meta bob2))))
(println (:age res)) ; => 23