underscore-db/dist/underscore-db.js

Use JavaScript objects as databases

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
var index = require('./');

index.save = function(db, destination) {
  destination = destination || 'db';
  localStorage.setItem(destination, JSON.stringify(db, null, 2));
};

index.load = function(source) {
  source = source || 'db';
  return JSON.parse(localStorage.getItem(source));
};

_.mixin(index);
},{"./":2}],2:[function(require,module,exports){
// UUID
// https://gist.github.com/LeverOne/1308368
/* jshint ignore:start */
function uuid(a,b){for(b=a='';a++<36;b+=a*51&52?(a^15?8^Math.random()*(a^20?16:4):4).toString(16):'-');return b}
/* jshint ignore:end */

module.exports = {
  // Empties properties
  __empty: function(doc) {
    this.forEach(doc, function(value, key) {
      delete doc[key];
    });
  },

  // Copies properties from an object to another
  __update: function(dest, src) {
    this.forEach(src, function(value, key) {
      dest[key] = value;
    });
  },

  // Removes an item from an array
  __remove: function(array, item) {
    var index = this.indexOf(array, item);
    if (index != -1) array.splice(index, 1);
  },

  __id: function() {
    var id = this.id || 'id';
    return id;
  },

  getById: function(collection, id) {
    var self = this;
    return this.find(collection, function(doc) {
      if (self.has(doc, self.__id())) {
        return doc[self.__id()].toString() === id.toString();
      }
    });
  },

  createId: function(collection, doc) {
    return uuid();
  },

  insert: function(collection, doc) {
    doc[this.__id()] = doc[this.__id()] || this.createId(collection, doc);
    var d = this.getById(collection, doc[this.__id()]);
    if (d) throw new Error("Insert failed; duplicate id.");
    collection.push(doc);
    return doc;
  },

  upsert: function(collection, doc) {
    if (doc[this.__id()]) {
      // id is set
      var d = this.getById(collection, doc[this.__id()]);
      if (d) {
        // replace properties of existing object
        this.__empty(d);
        this.assign(d, doc);
      } else {
        // push new object
        collection.push(doc);
      }
    } else {
      // create id and push new object
      doc[this.__id()] = this.createId(collection, doc);
      collection.push(doc);
    }

    return doc;
  },

  updateById: function(collection, id, attrs) {
    var doc = this.getById(collection, id);

    if (doc) {
      this.assign(doc, attrs, {id: doc.id});
    }

    return doc;
  },

  updateWhere: function(collection, predicate, attrs) {
    var self = this;
    var docs = this.filter(collection, predicate);

    docs.forEach(function(doc) {
      self.assign(doc, attrs, {id: doc.id});
    });

    return docs;
  },

  replaceById: function(collection, id, attrs) {
    var doc = this.getById(collection, id);

    if (doc) {
      var docId = doc.id;
      this.__empty(doc);
      this.assign(doc, attrs, {id: docId});
    }

    return doc;
  },

  removeById: function(collection, id) {
    var doc = this.getById(collection, id);

    this.__remove(collection, doc);

    return doc;
  },

  removeWhere: function(collection, predicate) {
    var self = this;
    var docs = this.filter(collection, predicate);

    docs.forEach(function(doc) {
      self.__remove(collection, doc);
    });

    return docs;
  }
};

},{}]},{},[1]);