discourse/app/assets/javascripts/admin/models/site_setting.js

/**
  Our data model for interacting with site settings.

  @class SiteSetting    
  @extends Discourse.Model
  @namespace Discourse
  @module Discourse
**/ 
Discourse.SiteSetting = Discourse.Model.extend({
  
  // Whether a property is short.
  short: (function() {
    if (this.blank('value')) return true;
    return this.get('value').toString().length < 80;
  }).property('value'),

  // Whether the site setting has changed
  dirty: (function() {
    return this.get('originalValue') !== this.get('value');
  }).property('originalValue', 'value'),

  overridden: (function() {
    var defaultVal, val;
    val = this.get('value');
    defaultVal = this.get('default');
    if (val && defaultVal) {
      return val.toString() !== defaultVal.toString();
    }
    return val !== defaultVal;
  }).property('value'),

  resetValue: function() {
    this.set('value', this.get('originalValue'));
  },

  save: function() {
    // Update the setting
    var _this = this;
    return jQuery.ajax("/admin/site_settings/" + (this.get('setting')), {
      data: { value: this.get('value') },
      type: 'PUT',
      success: function() {
        _this.set('originalValue', _this.get('value'));
      }
    });
  }
});

Discourse.SiteSetting.reopenClass({
  findAll: function() {
    var result;
    result = Em.A();
    jQuery.get("/admin/site_settings", function(settings) {
      return settings.each(function(s) {
        s.originalValue = s.value;
        return result.pushObject(Discourse.SiteSetting.create(s));
      });
    });
    return result;
  }
});