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({

  /**
    Is the boolean setting true?

    @property enabled
  **/
  enabled: function(key, value) {

    if (arguments.length === 1) {
      // get the boolean value of the setting
      if (this.blank('value')) return false;
      return this.get('value') === 'true';

    } else {
      // set the boolean value of the setting
      this.set('value', value ? 'true' : 'false');

      // We save booleans right away, it's not like a text field where it makes sense to
      // undo what you typed in.
      this.save();
    }

  }.property('value'),

  /**
    Has the user changed the setting? If so we should save it.

    @property dirty
  **/
  dirty: function() {
    return this.get('originalValue') !== this.get('value');
  }.property('originalValue', 'value'),

  /**
    Has the setting been overridden from its default value?

    @property overridden
  **/
  overridden: function() {
    var val = this.get('value');
    var defaultVal = this.get('default');

    if (val === null) val = '';
    if (defaultVal === null) defaultVal = '';

    return val.toString() !== defaultVal.toString();
  }.property('value'),

  /**
    Reset the setting to its original value.

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

  /**
    Save the setting's value.

    @method save
  **/
  save: function() {
    // Update the setting
    var setting = this;
    return Discourse.ajax("/admin/site_settings/" + (this.get('setting')), {
      data: { value: this.get('value') },
      type: 'PUT'
    }).then(function() {
      setting.set('originalValue', setting.get('value'));
    });
  }
});

Discourse.SiteSetting.reopenClass({

  /**
    Retrieve all settings from the server

    @method findAll
  **/
  findAll: function() {
    var result = Em.A();
    Discourse.ajax("/admin/site_settings").then(function (settings) {
      settings.site_settings.each(function(s) {
        s.originalValue = s.value;
        result.pushObject(Discourse.SiteSetting.create(s));
      });
      result.set('diags', settings.diags);
    });
    return result;
  },

  update: function(key, value) {
    return Discourse.ajax("/admin/site_settings/" + key, {
      type: 'PUT',
      data: { value: value }
    });
  }
});