Rails Settings Cached

This is improved from rails-settings, added caching for all settings. Settings is a plugin that makes managing a table of global key, value pairs easy. Think of it like a global Hash stored in your database, that uses simple ActiveRecord like methods for manipulation. Keep track of any global setting that you dont want to hard code into your rails app. You can store any kind of object. Strings, numbers, arrays, or any object.

Status

Setup

Edit your Gemfile:

ruby gem "rails-settings-cached"

Generate your settings:

bash $ rails g settings:install

If you want custom model name:

bash $ rails g settings:install SiteConfig

Now just put that migration in the database with:

bash rake db:migrate

Usage

The syntax is easy. First, lets create some settings to keep track of:

ruby Setting.admin_password = 'supersecret' Setting.date_format = '%m %d, %Y' Setting.cocktails = ['Martini', 'Screwdriver', 'White Russian'] Setting.foo = 123 Setting.credentials = { :username => 'tom', :password => 'secret' }

Now lets read them back:

ruby Setting.foo # returns 123

Changing an existing setting is the same as creating a new setting:

ruby Setting.foo = 'super duper bar'

Decide you dont want to track a particular setting anymore?

ruby Setting.destroy :foo Setting.foo # returns nil

Want a list of all the settings? ruby Setting.get_all

You need name spaces and want a list of settings for a give name space? Just choose your prefered named space delimiter and use Setting.get_all (Settings.all for # Rails 3.x and 4.0.x) like this:

ruby Setting['preferences.color'] = :blue Setting['preferences.size'] = :large Setting['license.key'] = 'ABC-DEF' # Rails 4.1.x Setting.get_all('preferences.') # Rails 3.x and 4.0.x Setting.all('preferences.') # returns { 'preferences.color' => :blue, 'preferences.size' => :large }

Extend a model

Settings may be bound to any existing ActiveRecord object. Define this association like this: Notice! is not do caching in this version.

ruby class User < ActiveRecord::Base include RailsSettings::Extend end

Then you can set/get a setting for a given user instance just by doing this:

ruby user = User.find(123) user.settings.color = :red user.settings.color # returns :red user.settings.get_all # { "color" => :red }

If you want to find users having or not having some settings, there are named scopes for this:

```ruby User.with_settings # => returns a scope of users having any setting

User.with_settings_for(‘color’) # => returns a scope of users having a ‘color’ setting

User.without_settings # returns a scope of users having no setting at all (means user.settings.get_all == {})

User.without_settings(‘color’) # returns a scope of users having no ‘color’ setting (means user.settings.color == nil) ```

Default settings

Sometimes you may want define default settings.

RailsSettings has generate a config YAML file in:

```yml # config/app.yml defaults: &defaults github_token: “123456” twitter_token: “<%= ENV[“TWITTER_TOKEN”] %>” foo: bar: “Foo bar”

development: «: *defaults

test: «: *defaults

production: «: *defaults ```

And you can use by Setting model:

Setting.github_token => "123456" Setting.github_token = "654321" # Save into database. Setting.github_token # Read from databae / caching. => "654321" Setting['foo.bar'] => 'Foo bar'

NOTE: YAML setting it also under the cache scope, when you restart Rails application, cache will expire, so when you want change default config, you need restart Rails application server.

Caching flow:

Setting.foo -> Check Cache -> Exist - Write Cache -> Return | Check DB -> Exist -> Write Cache -> Return | Check Default -> Exist -> Write Cache -> Return | Return nil

Change cache key

ruby class Setting < RailsSettings::Base cache_prefix { 'you-prefix' } ... end

---

How to create a list, form to manage Settings?

If you want create an admin interface to editing the Settings, you can try methods in follow:

config/routes.rb

rb namespace :admin do resources :settings end

app/controllers/admin/settings_controller.rb

```rb module Admin class SettingsController < ApplicationController before_action :get_setting, only: [:edit, :update]

def index
  @settings = Setting.get_all
end

def edit
end

def update
  if @setting.value != params[:setting][:value]
    @setting.value = params[:setting][:value]
    @setting.save
    redirect_to admin_settings_path, notice: 'Setting has updated.'
  else
    redirect_to admin_settings_path
  end
end

def get_setting
  @setting = Setting.find_by(var: params[:id]) || Setting.new(var: params[:id])
end   end end ```

app/views/admin/settings/index.html.erb

```erb

<% @settings.each_key do |key| %> <% end %>

Key
<%= key %>	<%= link_to 'edit', edit_admin_setting_path(key) %>

```

app/views/admin/settings/edit.html.erb

erb <%= form_for(@setting, url: admin_setting_path(@setting.var), method: 'patch') do |f| %> <label><%= @setting.var %></label> <%= f.textarea :value, rows: 10 %> <%= f.submit %> <% end %>

Also you may use rails-settings-ui gem for building ready to using interface with validations.

Use case:

• ruby-china/ruby-china