HasTokenOn

Simple yet customizable token generator for Rails 3.

Features

Any number of tokens per model
Customizable length of each token
Prepending/Appending to token
Condition checking when setting the token
Setting token on various callbacks namely initialization, creation, updating
Customizable seed to generate token from

Examples

Initialization

Single token
```
has_token_on :slug, :length => 3
```

Multiple tokens, same configuration

has_token_on [:slug, :permalink], :length => 3

Multiple tokens with individual configuration

has_token_on :slug, :length => 3
has_token_on :permalink, :length => 5

.. or using single hash

has_token_on :slug => { :length => 3 }, :permalink => { :length => 5 }

Options

Options are as follows:

:length - token length. Default - 16.
```
has_token_on :slug, length => 3
```
:prepend - prepend something to the beginning of the token. Default - none.
```
has_token_on :slug, :prepend => "private"
```
:append - append something to the back of the token. Default - none.
```
has_token_on :slug, :append => "ending"
```
:unique - ensure that tokens is unique (checking is performed in the app logic). Default - false.
```
has_token_on :slug, :unique => true
```

:if - generate token only if provided condition is met. Default - none.

has_token_on :slug, :if => lambda { |record| record.private? }

:on - generates token on certain time: :initialize, :create (default), :update.
```
has_token_on :slug, :on => :initialize
```
:seed - elements or functions that are used to generate hash. Options:
- :securerandom - uses ActiveSupport::SecureRandom.hex (default)
```
has_token_on :slug, :seed => :securerandom
```
- :guid - uses simple_uuid gem. You should add it to your Gemfile. 36 characters long GUID. Length param is ignored.
```
has_token_on :slug, :seed => :guid
```
- ('a'..'z') - a Range. Mixes the range elements up to specified length.
```
has_token_on :slug, :seed => ('a'..'z')
```
- ['a', 'b', 'c'] - an Array. Mixes the array elements up to specified length.
```
has_token_on :slug, :seed => ['a', 'b', 'c']
```
- lambda { 2 * 2 } - a Proc. Executes proc. Length param is ignored.
```
has_token_on :slug, :seed => lambda { 2 * 2 }
```

Generator

has_token_on comes with a generator that generates a migration for token.

Usage:
  rails generate has_token_on:config MODEL NAME [options]

Options:
  [--length=N]             # Token length
  [--create-on=CREATE_ON]  # Create on: initialize, create, update
  [--with-index]           # Index the token field (default: es)
                           # Default: true
  [--unique]               # Is token unique?
                           # Default: true

Runtime options:
  -f, [--force]    # Overwrite files that already exist
  -p, [--pretend]  # Run but do not make any changes
  -q, [--quiet]    # Supress status output
  -s, [--skip]     # Skip files that already exist

Description:
  Generates a migration that adds token field a model. Modifies model code.

Example:
  rails g has_token_on:config paste token

Testing

Tested on Mac OS X with Ruby 1.9.2. Should work on Ruby 1.8.7+.

Enter gem directory
Execute
```
  bundle
  rake
```

You may use guard for continuous testing

bundle exec guard

NB it will try to install some OSX specific gems like 'rb-fsevent'.